Bump version to 12.0

Merge pull request #17826 from joshuaboniface/fix/bump_version
Fix bump_version by removing Jellyfin.MediaEncoding.Keyframes
2026-09-07 21:05:07 -04:00 · 2026-09-07 21:03:02 -04:00 · 2026-09-07 20:58:17 -04:00 · 2026-09-07 17:53:31 -04:00 · 2026-09-07 17:44:24 -04:00 · 2026-09-07 17:44:06 -04:00
261 changed files with 17495 additions and 1983 deletions
@@ -3,7 +3,7 @@
  "isRoot": true,
  "tools": {
    "dotnet-ef": {
-      "version": "10.0.10",
+      "version": "10.0.11",
      "commands": [
        "dotnet-ef"
      ]
@@ -32,13 +32,13 @@ jobs:
        dotnet-version: '10.0.x'

    - name: Initialize CodeQL
-      uses: github/codeql-action/init@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6
+      uses: github/codeql-action/init@ff2f1c621b7f889edc0d3c761ac2e6a3f8cdb0dd # v4.37.7
      with:
        languages: ${{ matrix.language }}
        queries: +security-extended

    - name: Autobuild
-      uses: github/codeql-action/autobuild@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6
+      uses: github/codeql-action/autobuild@ff2f1c621b7f889edc0d3c761ac2e6a3f8cdb0dd # v4.37.7

    - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6
+      uses: github/codeql-action/analyze@ff2f1c621b7f889edc0d3c761ac2e6a3f8cdb0dd # v4.37.7
@@ -143,6 +143,7 @@
 - [Smith00101010](https://github.com/Smith00101010)
 - [sorinyo2004](https://github.com/sorinyo2004)
 - [Soumyadip Auddy](https://github.com/SoumyadipAuddy)
+ - [st7105](https://github.com/st7105)
 - [sparky8251](https://github.com/sparky8251)
 - [spookbits](https://github.com/spookbits)
 - [ssenart](https://github.com/ssenart)
@@ -237,6 +238,9 @@
 - [elio42](https://github.com/elio42)
 - [rwebster85](https://github.com/rwebster85)
 - [Florin-Popescu](https://github.com/Florin-Popescu)
+ - [m0g3r](https://github.com/m0g3r)
+ - [martin-77](https://github.com/martin-77)
+ - [Oggeb1](https://github.com/Oggeb1)

 # Emby Contributors

@@ -247,7 +251,7 @@
 - [Mark2xv](https://github.com/Mark2xv)
 - [ScottRapsey](https://github.com/ScottRapsey)
 - [skynet600](https://github.com/skynet600)
- - [Cheesegeezer](https://githum.com/Cheesegeezer)
+ - [Cheesegeezer](https://github.com/Cheesegeezer)
 - [Radeon](https://github.com/radeonorama)
 - [gcw07](https://github.com/gcw07)
 - [SivaramAdhiappan](https://github.com/shivaram1190)
@@ -9,7 +9,7 @@
    <PackageVersion Include="AutoFixture.Xunit3" Version="4.19.0" />
    <PackageVersion Include="AutoFixture" Version="4.18.1" />
    <PackageVersion Include="BDInfo" Version="0.8.0" />
-    <PackageVersion Include="BitFaster.Caching" Version="2.6.0" />
+    <PackageVersion Include="BitFaster.Caching" Version="2.6.1" />
    <PackageVersion Include="BlurHashSharp.SkiaSharp" Version="1.4.0-pre.1" />
    <PackageVersion Include="BlurHashSharp" Version="1.4.0-pre.1" />
    <PackageVersion Include="CommandLineParser" Version="2.9.1" />
@@ -26,28 +26,28 @@
    <PackageVersion Include="libse" Version="4.0.12" />
    <PackageVersion Include="LrcParser" Version="2025.623.0" />
    <PackageVersion Include="MetaBrainz.MusicBrainz" Version="8.0.1" />
-    <PackageVersion Include="Microsoft.AspNetCore.Authorization" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.10" />
+    <PackageVersion Include="Microsoft.AspNetCore.Authorization" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.11" />
    <PackageVersion Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="5.6.0" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.Common" Version="5.6.0" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.6.0" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="5.6.0" />
-    <PackageVersion Include="Microsoft.Data.Sqlite" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.Relational" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.Tools" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.Extensions.Caching.Abstractions" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.Extensions.Caching.Memory" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.Extensions.Configuration.Abstractions" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.Extensions.Hosting.Abstractions" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.Extensions.Http" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.Extensions.Logging" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.Extensions.Options" Version="10.0.10" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.8.1" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.Common" Version="5.9.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.9.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="5.9.0" />
+    <PackageVersion Include="Microsoft.Data.Sqlite" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Relational" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Tools" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.Extensions.Caching.Abstractions" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.Extensions.Caching.Memory" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.Abstractions" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.Extensions.Hosting.Abstractions" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.Extensions.Http" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.Extensions.Logging" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.Extensions.Options" Version="10.0.11" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
    <PackageVersion Include="MimeTypes" Version="2.5.2" />
    <PackageVersion Include="Morestachio" Version="5.0.1.670" />
    <PackageVersion Include="Moq" Version="4.18.4" />
@@ -78,11 +78,11 @@
    <PackageVersion Include="Svg.Skia" Version="3.7.0" />
    <PackageVersion Include="Swashbuckle.AspNetCore.ReDoc" Version="10.2.3" />
    <PackageVersion Include="Swashbuckle.AspNetCore" Version="10.2.3" />
-    <PackageVersion Include="System.Text.Json" Version="10.0.10" />
+    <PackageVersion Include="System.Text.Json" Version="10.0.11" />
    <PackageVersion Include="TagLibSharp" Version="2.3.0" />
-    <PackageVersion Include="z440.atl.core" Version="7.15.3" />
+    <PackageVersion Include="z440.atl.core" Version="7.16.0" />
    <PackageVersion Include="TMDbLib" Version="3.0.0" />
-    <PackageVersion Include="UTF.Unknown" Version="2.6.0" />
+    <PackageVersion Include="UTF.Unknown" Version="2.7.0" />
    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
    <PackageVersion Include="xunit.v3" Version="3.2.2" />
    <PackageVersion Include="Xunit.v3.Priority" Version="1.1.18" />
@@ -151,7 +151,7 @@ namespace Emby.Naming.Common

            CleanStrings =
            [
-                @"^\s*(?<cleaned>.+?)[ _\,\.\(\)\[\]\-](3d|sbs|tab|hsbs|htab|mvc|HDR|HDC|UHD|UltraHD|4k|ac3|dts|custom|dc|divx|divx5|dsr|dsrip|dutch|dvd|dvdrip|dvdscr|dvdscreener|screener|dvdivx|cam|fragment|fs|hdtv|hdrip|hdtvrip|internal|limited|multi|subs|ntsc|ogg|ogm|pal|pdtv|proper|repack|rerip|retail|cd[1-9]|r5|bd5|bd|se|svcd|swedish|german|read.nfo|nfofix|unrated|ws|telesync|ts|telecine|tc|brrip|bdrip|480p|480i|576p|576i|720p|720i|1080p|1080i|2160p|hrhd|hrhdtv|hddvd|bluray|blu-ray|x264|x265|h264|h265|xvid|xvidvd|xxx|www.www|AAC|DTS)(?=[ _\,\.\(\)\[\]\-]|$)",
+                @"^\s*(?<cleaned>.+?)[ _\,\.\(\)\[\]\-](3d|sbs|tab|hsbs|htab|mvc|HDR|HDC|UHD|UltraHD|4k|ac3|dts|custom|dc|divx|divx5|dsr|dsrip|dutch|dvd|dvdrip|dvdscr|dvdscreener|screener|dvdivx|cam|fragment|fs|hdtv|hdrip|hdtvrip|internal|limited|multi|subs|ntsc|ogg|ogm|pal|pdtv|proper|repack|rerip|retail|cd[1-9]|r5|bd5|bd|se|svcd|swedish|german|read.nfo|nfofix|unrated|ws|web-dl|telesync|ts|telecine|tc|brrip|bdrip|480p|480i|576p|576i|720p|720i|1080p|1080i|2160p|hrhd|hrhdtv|hddvd|bluray|blu-ray|x264|x265|h264|h265|xvid|xvidvd|xxx|www.www|AAC|DTS)(?=[ _\,\.\(\)\[\]\-]|$)",
                @"^\s*(?<cleaned>.+?)((\s*\[[^\]]+\]\s*)+)(\.[^\s]+)?$",
                @"^\s*(?<cleaned>.+?)\WE[0-9]+(-|~)E?[0-9]+(\W|$)",
                @"^\s*\[[^\]]+\](?!\.\w+$)\s*(?<cleaned>.+)",
@@ -44,7 +44,14 @@ namespace Emby.Naming.ExternalFiles
            }

            var extension = Path.GetExtension(path.AsSpan());
-            if (!(_type == DlnaProfileType.Subtitle && _namingOptions.SubtitleFileExtensions.Contains(extension, StringComparison.OrdinalIgnoreCase))
+
+            // .idx carries VobSub per-track language metadata. Recognize it here rather
+            // than adding it to NamingOptions.SubtitleFileExtensions, which also gates
+            // subtitle uploads/saves.
+            var isVobSubIndex = _type == DlnaProfileType.Subtitle && extension.Equals(".idx", StringComparison.OrdinalIgnoreCase);
+
+            if (!isVobSubIndex
+                && !(_type == DlnaProfileType.Subtitle && _namingOptions.SubtitleFileExtensions.Contains(extension, StringComparison.OrdinalIgnoreCase))
                && !(_type == DlnaProfileType.Audio && _namingOptions.AudioFileExtensions.Contains(extension, StringComparison.OrdinalIgnoreCase))
                && !(_type == DlnaProfileType.Lyric && _namingOptions.LyricFileExtensions.Contains(extension, StringComparison.OrdinalIgnoreCase)))
            {
@@ -158,7 +158,9 @@ namespace Emby.Naming.TV
                        if (nextIndex >= name.Length
                            || !"0123456789iIpP".Contains(name[nextIndex], StringComparison.Ordinal))
                        {
-                            if (int.TryParse(endingNumberGroup.ValueSpan, NumberStyles.Integer, CultureInfo.InvariantCulture, out num))
+                            // A range cannot end before it starts, so a lower number belongs to the episode title rather than to a range.
+                            if (int.TryParse(endingNumberGroup.ValueSpan, NumberStyles.Integer, CultureInfo.InvariantCulture, out num)
+                                && num >= result.EpisodeNumber)
                            {
                                result.EndingEpisodeNumber = num;
                            }
@@ -226,7 +228,7 @@ namespace Emby.Naming.TV
                    info.SeriesName = result.SeriesName;
                }

-                if (!info.EndingEpisodeNumber.HasValue && info.EpisodeNumber.HasValue)
+                if (!info.EndingEpisodeNumber.HasValue && result.EndingEpisodeNumber >= info.EpisodeNumber)
                {
                    info.EndingEpisodeNumber = result.EndingEpisodeNumber;
                }
@@ -107,7 +107,8 @@ namespace Emby.Server.Implementations.Collections
                SaveLocalMetadata = true
            };

-            var name = _localizationManager.GetLocalizedString("Collections");
+            // This names a library for the whole server, so ignore the requesting client's language.
+            var name = _localizationManager.GetServerLocalizedString("Collections");

            await _libraryManager.AddVirtualFolder(name, CollectionTypeOptions.boxsets, libraryOptions, true).ConfigureAwait(false);

@@ -185,6 +185,13 @@ namespace Emby.Server.Implementations.Dto
                allCollectionFolders = _libraryManager.GetUserRootFolder().Children.OfType<Folder>().ToList();
            }

+            // Batch-fetch by-name item counts to avoid N+1 queries
+            Dictionary<Guid, ItemCounts>? itemCountsBatch = null;
+            if (options.ContainsField(ItemFields.ItemCounts))
+            {
+                itemCountsBatch = GetItemCountsBatch(accessibleItems, user);
+            }
+
            // Batch-fetch child counts for all folders to avoid N+1 queries
            Dictionary<Guid, int>? childCountBatch = null;
            if (options.ContainsField(ItemFields.ChildCount))
@@ -192,7 +199,7 @@ namespace Emby.Server.Implementations.Dto
                var folderIds = accessibleItems.OfType<Folder>().Select(f => f.Id).ToList();
                if (folderIds.Count > 0)
                {
-                    childCountBatch = _libraryManager.GetChildCountBatch(folderIds, user?.Id);
+                    childCountBatch = _libraryManager.GetChildCountBatch(folderIds, user);
                }
            }

@@ -293,7 +300,7 @@ namespace Emby.Server.Implementations.Dto

                if (options.ContainsField(ItemFields.ItemCounts))
                {
-                    SetItemByNameInfo(dto, user);
+                    SetItemByNameInfo(dto, user, itemCountsBatch);
                }

                returnItems[index] = dto;
@@ -518,14 +525,36 @@ namespace Emby.Server.Implementations.Dto
            return dto;
        }

-        private void SetItemByNameInfo(BaseItemDto dto, User? user)
+        private Dictionary<Guid, ItemCounts> GetItemCountsBatch(IReadOnlyList<BaseItem> items, User? user)
+        {
+            var result = new Dictionary<Guid, ItemCounts>();
+
+            foreach (var group in items.GroupBy(item => item.GetBaseItemKind()))
+            {
+                if (!_relatedItemKinds.TryGetValue(group.Key, out var relatedItemKinds))
+                {
+                    continue;
+                }
+
+                var ids = group.Select(item => item.Id).ToArray();
+                foreach (var (id, counts) in _libraryManager.GetItemCountsForNameItems(group.Key, ids, relatedItemKinds, user))
+                {
+                    result[id] = counts;
+                }
+            }
+
+            return result;
+        }
+
+        private void SetItemByNameInfo(BaseItemDto dto, User? user, IReadOnlyDictionary<Guid, ItemCounts>? prefetchedCounts = null)
        {
            if (!_relatedItemKinds.TryGetValue(dto.Type, out var relatedItemKinds))
            {
                return;
            }

-            var counts = _libraryManager.GetItemCountsForNameItem(dto.Type, dto.Id, relatedItemKinds, user);
+            var counts = prefetchedCounts?.GetValueOrDefault(dto.Id)
+                ?? _libraryManager.GetItemCountsForNameItem(dto.Type, dto.Id, relatedItemKinds, user);

            dto.AlbumCount = counts.AlbumCount;
            dto.ArtistCount = counts.ArtistCount;
@@ -611,7 +640,11 @@ namespace Emby.Server.Implementations.Dto
                    // For these types we can try to optimize and assume these values will be equal
                    if (item is MusicAlbum || item is Season || item is Playlist)
                    {
-                        dto.ChildCount = dto.RecursiveItemCount;
+                        if (dto.RecursiveItemCount > 0)
+                        {
+                            dto.ChildCount = dto.RecursiveItemCount;
+                        }
+
                        var folderChildCount = folder.LinkedChildren.Length;
                        // The default is an empty array, so we can't reliably use the count when it's empty
                        if (folderChildCount > 0)
@@ -696,7 +729,8 @@ namespace Emby.Server.Implementations.Dto
                return count;
            }

-            // Fall back to individual query for special cases (Series, Season, etc.)
+            // Only reached when no batch was computed: the batch holds an entry for every folder it
+            // was asked about, zero included.
            return folder.GetChildCount(user);
        }

@@ -27,6 +27,11 @@ namespace Emby.Server.Implementations.EntryPoints;
 /// </summary>
 public sealed class LibraryChangedNotifier : IHostedService, IDisposable
 {
+    // A batch holds a live reference to every item it names, so it has to stay small enough that a
+    // library scan - which changes items faster than any batch window closes - cannot grow it without
+    // bound. Reached only by a scan; interactive use closes a batch on the window long before this.
+    internal const int MaxBatchSize = 2000;
+
    private readonly ILibraryManager _libraryManager;
    private readonly IServerConfigurationManager _configurationManager;
    private readonly IProviderManager _providerManager;
@@ -35,11 +40,11 @@ public sealed class LibraryChangedNotifier : IHostedService, IDisposable
    private readonly ILogger<LibraryChangedNotifier> _logger;

    private readonly Lock _libraryChangedSyncLock = new();
-    private readonly List<Folder> _foldersAddedTo = new();
-    private readonly List<Folder> _foldersRemovedFrom = new();
-    private readonly List<BaseItem> _itemsAdded = new();
-    private readonly List<BaseItem> _itemsRemoved = new();
-    private readonly List<BaseItem> _itemsUpdated = new();
+    private readonly Dictionary<Guid, Folder> _foldersAddedTo = [];
+    private readonly Dictionary<Guid, Folder> _foldersRemovedFrom = [];
+    private readonly Dictionary<Guid, BaseItem> _itemsAdded = [];
+    private readonly Dictionary<Guid, BaseItem> _itemsRemoved = [];
+    private readonly Dictionary<Guid, BaseItem> _itemsUpdated = [];
    private readonly ConcurrentDictionary<Guid, DateTime> _lastProgressMessageTimes = new();

    private Timer? _libraryUpdateTimer;
@@ -173,7 +178,7 @@ public sealed class LibraryChangedNotifier : IHostedService, IDisposable
    private void OnLibraryItemRemoved(object? sender, ItemChangeEventArgs e)
        => OnLibraryChange(e.Item, e.Parent, _itemsRemoved, _foldersRemovedFrom);

-    private void OnLibraryChange(BaseItem item, BaseItem parent, List<BaseItem> itemsList, List<Folder>? foldersList)
+    private void OnLibraryChange(BaseItem item, BaseItem parent, Dictionary<Guid, BaseItem> itemsList, Dictionary<Guid, Folder>? foldersList)
    {
        if (!FilterItem(item))
        {
@@ -182,23 +187,28 @@ public sealed class LibraryChangedNotifier : IHostedService, IDisposable

        lock (_libraryChangedSyncLock)
        {
-            var updateDuration = TimeSpan.FromSeconds(_configurationManager.Configuration.LibraryUpdateDuration);
-
+            // The window runs from the first change of a batch and is never extended. Extending it on
+            // every change would keep a library scan's batch open for the whole scan, and the batch
+            // holds the items it names alive, so it would grow to the size of the library.
            if (_libraryUpdateTimer is null)
            {
+                var updateDuration = TimeSpan.FromSeconds(_configurationManager.Configuration.LibraryUpdateDuration);
                _libraryUpdateTimer = new Timer(LibraryUpdateTimerCallback, null, updateDuration, Timeout.InfiniteTimeSpan);
            }
-            else
-            {
-                _libraryUpdateTimer.Change(updateDuration, Timeout.InfiniteTimeSpan);
-            }

            if (foldersList is not null && parent is Folder folder)
            {
-                foldersList.Add(folder);
+                foldersList[folder.Id] = folder;
            }

-            itemsList.Add(item);
+            itemsList[item.Id] = item;
+
+            // A window long enough to cover a burst still has to give way once the batch is large
+            // enough to be worth sending on its own.
+            if (_itemsAdded.Count + _itemsRemoved.Count + _itemsUpdated.Count >= MaxBatchSize)
+            {
+                _libraryUpdateTimer.Change(TimeSpan.Zero, Timeout.InfiniteTimeSpan);
+            }
        }
    }

@@ -211,22 +221,16 @@ public sealed class LibraryChangedNotifier : IHostedService, IDisposable
        List<BaseItem> itemsRemoved;
        lock (_libraryChangedSyncLock)
        {
-            // Remove dupes in case some were saved multiple times
-            foldersAddedTo = _foldersAddedTo
-                .DistinctBy(x => x.Id)
-                .ToList();
-
-            foldersRemovedFrom = _foldersRemovedFrom
-                .DistinctBy(x => x.Id)
-                .ToList();
+            foldersAddedTo = _foldersAddedTo.Values.ToList();
+            foldersRemovedFrom = _foldersRemovedFrom.Values.ToList();

            itemsUpdated = _itemsUpdated
-                .Where(i => !_itemsAdded.Contains(i))
-                .DistinctBy(x => x.Id)
+                .Where(e => !_itemsAdded.ContainsKey(e.Key))
+                .Select(e => e.Value)
                .ToList();

-            itemsAdded = _itemsAdded.ToList();
-            itemsRemoved = _itemsRemoved.ToList();
+            itemsAdded = _itemsAdded.Values.ToList();
+            itemsRemoved = _itemsRemoved.Values.ToList();

            if (_libraryUpdateTimer is not null)
            {
@@ -241,6 +245,15 @@ public sealed class LibraryChangedNotifier : IHostedService, IDisposable
            _foldersRemovedFrom.Clear();
        }

+        if (itemsAdded.Count == 0
+            && itemsUpdated.Count == 0
+            && itemsRemoved.Count == 0
+            && foldersAddedTo.Count == 0
+            && foldersRemovedFrom.Count == 0)
+        {
+            return;
+        }
+
        await SendChangeNotifications(itemsAdded, itemsUpdated, itemsRemoved, foldersAddedTo, foldersRemovedFrom, CancellationToken.None).ConfigureAwait(false);
    }

@@ -18,15 +18,17 @@ namespace Emby.Server.Implementations.EntryPoints
    public sealed class UserDataChangeNotifier : IHostedService, IDisposable
    {
        private const int UpdateDuration = 500;
+        internal const int MaxBatchSize = 2000;

        private readonly ISessionManager _sessionManager;
        private readonly IUserDataManager _userDataManager;
        private readonly IUserManager _userManager;

-        private readonly Dictionary<Guid, List<BaseItem>> _changedItems = new();
+        private readonly Dictionary<Guid, Dictionary<Guid, BaseItem>> _changedItems = [];
        private readonly Lock _syncLock = new();

        private Timer? _updateTimer;
+        private int _changedItemCount;

        /// <summary>
        /// Initializes a new instance of the <see cref="UserDataChangeNotifier"/> class.
@@ -69,50 +71,64 @@ namespace Emby.Server.Implementations.EntryPoints

            lock (_syncLock)
            {
-                if (_updateTimer is null)
-                {
-                    _updateTimer = new Timer(
-                        UpdateTimerCallback,
-                        null,
-                        UpdateDuration,
-                        Timeout.Infinite);
-                }
-                else
-                {
-                    _updateTimer.Change(UpdateDuration, Timeout.Infinite);
-                }
+                // The window runs from the first change of a batch and is never extended, so a stream
+                // of changes that never pauses - a library scan - still closes its batches instead of
+                // holding every item it touched alive until the stream stops.
+                _updateTimer ??= new Timer(
+                    UpdateTimerCallback,
+                    null,
+                    UpdateDuration,
+                    Timeout.Infinite);

-                if (!_changedItems.TryGetValue(e.UserId, out List<BaseItem>? keys))
+                if (!_changedItems.TryGetValue(e.UserId, out Dictionary<Guid, BaseItem>? keys))
                {
-                    keys = new List<BaseItem>();
+                    keys = [];
                    _changedItems[e.UserId] = keys;
                }

-                keys.Add(e.Item);
-
                var baseItem = e.Item;

                // Go up one level for indicators
                if (baseItem is not null)
                {
+                    Track(keys, baseItem);
+
                    var parent = baseItem.GetOwner() ?? baseItem.GetParent();

                    if (parent is not null)
                    {
-                        keys.Add(parent);
+                        Track(keys, parent);
                    }
                }
+
+                // A window long enough to cover a burst still has to give way once the batch is
+                // large enough to be worth sending on its own.
+                if (_changedItemCount >= MaxBatchSize)
+                {
+                    _updateTimer.Change(0, Timeout.Infinite);
+                }
+            }
+        }
+
+        private void Track(Dictionary<Guid, BaseItem> keys, BaseItem item)
+        {
+            var before = keys.Count;
+            keys[item.Id] = item;
+
+            if (keys.Count != before)
+            {
+                _changedItemCount++;
            }
        }

        private async void UpdateTimerCallback(object? state)
        {
-            List<KeyValuePair<Guid, List<BaseItem>>> changes;
+            List<KeyValuePair<Guid, Dictionary<Guid, BaseItem>>> changes;
            lock (_syncLock)
            {
-                // Remove dupes in case some were saved multiple times
                changes = _changedItems.ToList();
                _changedItems.Clear();
+                _changedItemCount = 0;

                if (_updateTimer is not null)
                {
@@ -121,17 +137,22 @@ namespace Emby.Server.Implementations.EntryPoints
                }
            }

+            if (changes.Count == 0)
+            {
+                return;
+            }
+
            foreach (var (userId, changedItems) in changes)
            {
                await _sessionManager.SendMessageToUserSessions(
                    [userId],
                    SessionMessageType.UserDataChanged,
-                    () => GetUserDataChangeInfo(userId, changedItems),
+                    () => GetUserDataChangeInfo(userId, changedItems.Values),
                    default).ConfigureAwait(false);
            }
        }

-        private UserDataChangeInfo GetUserDataChangeInfo(Guid userId, List<BaseItem> changedItems)
+        private UserDataChangeInfo GetUserDataChangeInfo(Guid userId, IEnumerable<BaseItem> changedItems)
        {
            var user = _userManager.GetUserById(userId)
                ?? throw new ArgumentException("Invalid user ID", nameof(userId));
@@ -140,7 +161,6 @@ namespace Emby.Server.Implementations.EntryPoints
            {
                UserId = userId,
                UserDataList = changedItems
-                    .DistinctBy(x => x.Id)
                    .Select(i =>
                    {
                        var dto = _userDataManager.GetUserDataDto(i, user);
@@ -8,6 +8,7 @@ using Emby.Server.Implementations.Library;
 using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Library;
+using MediaBrowser.Controller.Providers;
 using MediaBrowser.Model.IO;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
@@ -21,6 +22,7 @@ namespace Emby.Server.Implementations.IO
        private readonly ILibraryManager _libraryManager;
        private readonly IServerConfigurationManager _configurationManager;
        private readonly IFileSystem _fileSystem;
+        private readonly IDirectoryService _directoryService;
        private readonly DotIgnoreIgnoreRule _dotIgnoreIgnoreRule;

        /// <summary>
@@ -47,6 +49,7 @@ namespace Emby.Server.Implementations.IO
        /// <param name="libraryManager">The library manager.</param>
        /// <param name="configurationManager">The configuration manager.</param>
        /// <param name="fileSystem">The filesystem.</param>
+        /// <param name="directoryService">The directory service.</param>
        /// <param name="appLifetime">The <see cref="IHostApplicationLifetime"/>.</param>
        /// <param name="dotIgnoreIgnoreRule">The .ignore rule handler.</param>
        public LibraryMonitor(
@@ -54,6 +57,7 @@ namespace Emby.Server.Implementations.IO
            ILibraryManager libraryManager,
            IServerConfigurationManager configurationManager,
            IFileSystem fileSystem,
+            IDirectoryService directoryService,
            IHostApplicationLifetime appLifetime,
            DotIgnoreIgnoreRule dotIgnoreIgnoreRule)
        {
@@ -61,6 +65,7 @@ namespace Emby.Server.Implementations.IO
            _logger = logger;
            _configurationManager = configurationManager;
            _fileSystem = fileSystem;
+            _directoryService = directoryService;
            _dotIgnoreIgnoreRule = dotIgnoreIgnoreRule;

            appLifetime.ApplicationStarted.Register(Start);
@@ -363,6 +368,8 @@ namespace Emby.Server.Implementations.IO
                return;
            }

+            _directoryService.Invalidate(path);
+
            // Ignore certain files, If the parent of an ignored path has a change event, ignore that too
            foreach (var i in _tempIgnoredPaths.Keys)
            {
@@ -3,6 +3,7 @@

 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Globalization;
 using System.IO;
 using System.Linq;
@@ -15,7 +16,6 @@ using Emby.Naming.Common;
 using Emby.Naming.TV;
 using Emby.Naming.Video;
 using Emby.Server.Implementations.Library.Resolvers;
-using Emby.Server.Implementations.Library.Validators;
 using Emby.Server.Implementations.Playlists;
 using Emby.Server.Implementations.ScheduledTasks.Tasks;
 using Emby.Server.Implementations.Sorting;
@@ -35,7 +35,6 @@ using MediaBrowser.Controller.Entities.Movies;
 using MediaBrowser.Controller.IO;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.LiveTv;
-using MediaBrowser.Controller.MediaEncoding;
 using MediaBrowser.Controller.Persistence;
 using MediaBrowser.Controller.Playlists;
 using MediaBrowser.Controller.Providers;
@@ -75,7 +74,6 @@ namespace Emby.Server.Implementations.Library
        private readonly Lazy<IProviderManager> _providerManagerFactory;
        private readonly Lazy<IUserViewManager> _userViewManagerFactory;
        private readonly IServerApplicationHost _appHost;
-        private readonly IMediaEncoder _mediaEncoder;
        private readonly IFileSystem _fileSystem;
        private readonly IItemRepository _itemRepository;
        private readonly IItemPersistenceService _persistenceService;
@@ -88,6 +86,7 @@ namespace Emby.Server.Implementations.Library
        private readonly ExtraResolver _extraResolver;
        private readonly IPathManager _pathManager;
        private readonly ILocalizationManager _localization;
+        private readonly IDirectoryService _directoryService;
        private readonly FastConcurrentLru<Guid, BaseItem> _cache;
        private readonly DotIgnoreIgnoreRule _dotIgnoreIgnoreRule;
        private readonly IMediaStreamRepository _mediaStreamRepository;
@@ -122,7 +121,6 @@ namespace Emby.Server.Implementations.Library
        /// <param name="fileSystem">The file system.</param>
        /// <param name="providerManagerFactory">The provider manager.</param>
        /// <param name="userViewManagerFactory">The user view manager.</param>
-        /// <param name="mediaEncoder">The media encoder.</param>
        /// <param name="itemRepository">The item repository.</param>
        /// <param name="persistenceService">The item persistence service.</param>
        /// <param name="nextUpService">The next up service.</param>
@@ -148,7 +146,6 @@ namespace Emby.Server.Implementations.Library
            IFileSystem fileSystem,
            Lazy<IProviderManager> providerManagerFactory,
            Lazy<IUserViewManager> userViewManagerFactory,
-            IMediaEncoder mediaEncoder,
            IItemRepository itemRepository,
            IItemPersistenceService persistenceService,
            INextUpService nextUpService,
@@ -174,7 +171,6 @@ namespace Emby.Server.Implementations.Library
            _fileSystem = fileSystem;
            _providerManagerFactory = providerManagerFactory;
            _userViewManagerFactory = userViewManagerFactory;
-            _mediaEncoder = mediaEncoder;
            _itemRepository = itemRepository;
            _persistenceService = persistenceService;
            _nextUpService = nextUpService;
@@ -189,6 +185,7 @@ namespace Emby.Server.Implementations.Library
            _pathManager = pathManager;
            _dotIgnoreIgnoreRule = dotIgnoreIgnoreRule;
            _localization = localization;
+            _directoryService = directoryService;
            _extraResolver = new ExtraResolver(loggerFactory.CreateLogger<ExtraResolver>(), namingOptions, directoryService);

            _configurationManager.ConfigurationUpdated += ConfigurationUpdated;
@@ -1209,6 +1206,12 @@ namespace Emby.Server.Implementations.Library
                .FirstOrDefault();
        }

+        /// <inheritdoc />
+        public Guid GetPersonId(string name)
+        {
+            return GetItemByNameId<Person>(Person.GetPath(name));
+        }
+
        /// <inheritdoc />
        public Person? GetPerson(string name)
        {
@@ -1222,6 +1225,33 @@ namespace Emby.Server.Implementations.Library
            return null;
        }

+        /// <inheritdoc />
+        public Person GetOrCreatePerson(string name)
+        {
+            var existing = GetPerson(name);
+            if (existing is not null)
+            {
+                return existing;
+            }
+
+            var path = Person.GetPath(name);
+            var info = Directory.CreateDirectory(path);
+            var item = new Person
+            {
+                Name = name,
+                Id = GetItemByNameId<Person>(path),
+                DateCreated = info.CreationTimeUtc,
+                DateModified = info.LastWriteTimeUtc,
+                Path = path
+            };
+
+            item.PresentationUniqueKey = item.CreatePresentationUniqueKey();
+
+            CreateItem(item, null);
+
+            return item;
+        }
+
        /// <summary>
        /// Gets the studio.
        /// </summary>
@@ -1354,15 +1384,6 @@ namespace Emby.Server.Implementations.Library
            return GetNewItemIdInternal(path, typeof(T), forceCaseInsensitiveId);
        }

-        /// <inheritdoc />
-        public Task ValidatePeopleAsync(IProgress<double> progress, CancellationToken cancellationToken)
-        {
-            // Ensure the location is available.
-            Directory.CreateDirectory(_configurationManager.ApplicationPaths.PeoplePath);
-
-            return new PeopleValidator(this, _logger, _fileSystem).ValidatePeople(cancellationToken, progress);
-        }
-
        /// <summary>
        /// Reloads the root media folder.
        /// </summary>
@@ -1489,6 +1510,10 @@ namespace Emby.Server.Implementations.Library
            var numComplete = 0;
            var numTasks = tasks.Count;

+            _logger.LogInformation("Running {TaskCount} post-scan task(s)", numTasks);
+
+            var phaseStart = Stopwatch.GetTimestamp();
+
            foreach (var task in tasks)
            {
                // Prevent access to modified closure
@@ -1506,20 +1531,45 @@ namespace Emby.Server.Implementations.Library
                    progress.Report(innerPercent);
                });

-                _logger.LogDebug("Running post-scan task {0}", task.GetType().Name);
+                var taskName = task.GetType().Name;
+                var taskStart = Stopwatch.GetTimestamp();
+
+                _logger.LogInformation(
+                    "Running post-scan task {TaskNumber}/{TaskCount}: {TaskName}",
+                    currentNumComplete + 1,
+                    numTasks,
+                    taskName);

                try
                {
                    await task.Run(innerProgress, cancellationToken).ConfigureAwait(false);
+
+                    var elapsed = Stopwatch.GetElapsedTime(taskStart);
+                    _logger.LogInformation(
+                        "Post-scan task {TaskName} completed after {Minutes} minute(s) and {Seconds} seconds",
+                        taskName,
+                        Math.Truncate(elapsed.TotalMinutes),
+                        elapsed.Seconds);
                }
                catch (OperationCanceledException)
                {
-                    _logger.LogInformation("Post-scan task cancelled: {0}", task.GetType().Name);
+                    var elapsed = Stopwatch.GetElapsedTime(taskStart);
+                    _logger.LogInformation(
+                        "Post-scan task {TaskName} cancelled after {Minutes} minute(s) and {Seconds} seconds",
+                        taskName,
+                        Math.Truncate(elapsed.TotalMinutes),
+                        elapsed.Seconds);
                    throw;
                }
                catch (Exception ex)
                {
-                    _logger.LogError(ex, "Error running post-scan task");
+                    var elapsed = Stopwatch.GetElapsedTime(taskStart);
+                    _logger.LogError(
+                        ex,
+                        "Post-scan task {TaskName} failed after {Minutes} minute(s) and {Seconds} seconds",
+                        taskName,
+                        Math.Truncate(elapsed.TotalMinutes),
+                        elapsed.Seconds);
                }

                numComplete++;
@@ -1528,6 +1578,12 @@ namespace Emby.Server.Implementations.Library
                progress.Report(percent * 100);
            }

+            var phaseElapsed = Stopwatch.GetElapsedTime(phaseStart);
+            _logger.LogInformation(
+                "All post-scan tasks completed after {Minutes} minute(s) and {Seconds} seconds",
+                Math.Truncate(phaseElapsed.TotalMinutes),
+                phaseElapsed.Seconds);
+
            _persistenceService.UpdateInheritedValues();

            progress.Report(100);
@@ -1745,9 +1801,21 @@ namespace Emby.Server.Implementations.Library
            return _countService.GetItemCountsForNameItem(kind, id, relatedItemKinds, query);
        }

-        public Dictionary<Guid, int> GetChildCountBatch(IReadOnlyList<Guid> parentIds, Guid? userId)
+        /// <inheritdoc/>
+        public Dictionary<Guid, ItemCounts> GetItemCountsForNameItems(BaseItemKind kind, IReadOnlyList<Guid> ids, BaseItemKind[] relatedItemKinds, User? user)
        {
-            return _countService.GetChildCountBatch(parentIds, userId);
+            var query = new InternalItemsQuery(user);
+            if (user is not null)
+            {
+                AddUserToQuery(query, user);
+            }
+
+            return _countService.GetItemCountsForNameItems(kind, ids, relatedItemKinds, query);
+        }
+
+        public Dictionary<Guid, int> GetChildCountBatch(IReadOnlyList<Guid> parentIds, User? user)
+        {
+            return _countService.GetChildCountBatch(parentIds, user);
        }

        /// <inheritdoc/>
@@ -1914,14 +1982,14 @@ namespace Emby.Server.Implementations.Library
            }

            // Optimize by querying against top level views
-            query.TopParentIds = parents.SelectMany(i => GetTopParentIdsForQuery(i, query.User)).ToArray();
-            query.AncestorIds = [];
-
-            // Prevent searching in all libraries due to empty filter
-            if (query.TopParentIds.Length == 0)
+            var topParentIds = parents.SelectMany(i => GetTopParentIdsForQuery(i, query.User)).ToArray();
+            if (topParentIds.Length == 0)
            {
-                query.TopParentIds = [Guid.NewGuid()];
+                return;
            }
+
+            query.TopParentIds = topParentIds;
+            query.AncestorIds = [];
        }

        public QueryResult<(BaseItem Item, ItemCounts ItemCounts)> GetAlbumArtists(InternalItemsQuery query)
@@ -1967,12 +2035,15 @@ namespace Emby.Server.Implementations.Library
            if (parents.All(i => i is ICollectionFolder || i is UserView))
            {
                // Optimize by querying against top level views
-                query.TopParentIds = parents.SelectMany(i => GetTopParentIdsForQuery(i, query.User)).ToArray();
+                var topParentIds = parents.SelectMany(i => GetTopParentIdsForQuery(i, query.User)).ToArray();

-                // Prevent searching in all libraries due to empty filter
-                if (query.TopParentIds.Length == 0)
+                if (topParentIds.Length > 0)
                {
-                    query.TopParentIds = [Guid.NewGuid()];
+                    query.TopParentIds = topParentIds;
+                }
+                else
+                {
+                    SetAncestorIds(query, parents);
                }
            }
            else if (parents.Count == 1 && parents.First() is Folder folder
@@ -1981,34 +2052,31 @@ namespace Emby.Server.Implementations.Library
            {
                // Playlists and BoxSets store their contents in LinkedChildren and never
                // populate AncestorIds for those items, so a recursive AncestorIds query
-                // would return zero rows. Resolve to the linked child IDs up front and
-                // route through the existing indexed ItemIds filter.
-                query.ItemIds = folder.LinkedChildren
-                    .Where(lc => lc.ItemId.HasValue && !lc.ItemId.Value.IsEmpty())
-                    .Select(lc => lc.ItemId!.Value)
-                    .ToArray();
-
-                // Empty linked-children should still return empty rather than scanning everything.
-                if (query.ItemIds.Length == 0)
-                {
-                    query.ItemIds = [Guid.NewGuid()];
-                }
+                // would return zero rows. Filter by the descendant set instead, which follows
+                // the links and keeps descending, so a linked folder contributes what is below
+                // it as well - the episodes of a Series added to a collection, for example.
+                query.DescendantOfId = folder.Id;
            }
            else
            {
-                // We need to be able to query from any arbitrary ancestor up the tree
-                query.AncestorIds = parents.SelectMany(i => i.GetIdsForAncestorQuery()).ToArray();
-
-                // Prevent searching in all libraries due to empty filter
-                if (query.AncestorIds.Length == 0)
-                {
-                    query.AncestorIds = [Guid.NewGuid()];
-                }
+                SetAncestorIds(query, parents);
            }

            query.Parent = null;
        }

+        private static void SetAncestorIds(InternalItemsQuery query, IReadOnlyCollection<BaseItem> parents)
+        {
+            // We need to be able to query from any arbitrary ancestor up the tree
+            query.AncestorIds = parents.SelectMany(i => i.GetIdsForAncestorQuery()).ToArray();
+
+            // Prevent searching in all libraries due to empty filter
+            if (query.AncestorIds.Length == 0)
+            {
+                query.AncestorIds = [Guid.NewGuid()];
+            }
+        }
+
        private void AddUserToQuery(InternalItemsQuery query, User user, bool allowExternalContent = true)
        {
            if (query.User is null)
@@ -2519,9 +2587,15 @@ namespace Emby.Server.Implementations.Library
                    }
                }

-                if (!File.Exists(image.Path))
+                if (string.IsNullOrEmpty(image.Path) || !File.Exists(image.Path))
                {
-                    _logger.LogWarning("Image not found at {ImagePath}", image.Path);
+                    _logger.LogWarning(
+                        "{ImageType} image for {ItemName} ({ItemId}) not found at \"{ImagePath}\", source was {SourcePath}",
+                        img.Type,
+                        item.Name,
+                        item.Id,
+                        image.Path,
+                        img.Path);
                    continue;
                }

@@ -2919,7 +2993,8 @@ namespace Emby.Server.Implementations.Library
                "views",
                _fileSystem.GetValidFilename(viewType.ToString()));

-            var id = GetNewItemId(path + "_namedview_" + name, typeof(UserView));
+            // The display name is localized, so it must not take part in the id.
+            var id = GetNewItemId(path + "_namedview_" + viewType.ToString(), typeof(UserView));

            var item = GetItemById(id) as UserView;

@@ -2943,6 +3018,13 @@ namespace Emby.Server.Implementations.Library

                refresh = true;
            }
+            else if (!string.Equals(item.Name, name, StringComparison.Ordinal))
+            {
+                item.Name = name;
+                item.ForcedSortName = sortName;
+
+                refresh = true;
+            }

            if (refresh)
            {
@@ -2963,7 +3045,9 @@ namespace Emby.Server.Implementations.Library
            var parentIdString = parentId.IsEmpty()
                ? null
                : parentId.ToString("N", CultureInfo.InvariantCulture);
-            var idValues = "38_namedview_" + name + user.Id.ToString("N", CultureInfo.InvariantCulture) + (parentIdString ?? string.Empty) + (viewType?.ToString() ?? string.Empty);
+
+            // The name is either localized (grouped views) or the library folder's own name.
+            var idValues = "38_namedview_" + user.Id.ToString("N", CultureInfo.InvariantCulture) + (parentIdString ?? string.Empty) + (viewType?.ToString() ?? string.Empty);

            var id = GetNewItemId(idValues, typeof(UserView));

@@ -2993,6 +3077,11 @@ namespace Emby.Server.Implementations.Library

                isNew = true;
            }
+            else if (!string.Equals(item.Name, name, StringComparison.Ordinal))
+            {
+                item.Name = name;
+                item.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, CancellationToken.None).GetAwaiter().GetResult();
+            }

            var lastRefreshedUtc = item.DateLastRefreshed;
            var refresh = isNew || DateTime.UtcNow - lastRefreshedUtc >= _viewRefreshInterval;
@@ -3094,7 +3183,7 @@ namespace Emby.Server.Implementations.Library
            var parentIdString = parentId.IsEmpty()
                ? null
                : parentId.ToString("N", CultureInfo.InvariantCulture);
-            var idValues = "37_namedview_" + name + (parentIdString ?? string.Empty) + (viewType?.ToString() ?? string.Empty);
+            var idValues = "37_namedview_" + (parentIdString ?? string.Empty) + (viewType?.ToString() ?? string.Empty);
            if (!string.IsNullOrEmpty(uniqueId))
            {
                idValues += uniqueId;
@@ -3128,9 +3217,10 @@ namespace Emby.Server.Implementations.Library
                isNew = true;
            }

-            if (viewType != item.ViewType)
+            if (viewType != item.ViewType || !string.Equals(item.Name, name, StringComparison.Ordinal))
            {
                item.ViewType = viewType;
+                item.Name = name;
                item.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, CancellationToken.None).GetAwaiter().GetResult();
            }

@@ -3550,6 +3640,12 @@ namespace Emby.Server.Implementations.Library
            return _peopleRepository.GetPeopleNames(query);
        }

+        /// <inheritdoc/>
+        public int DeleteOrphanedCredits()
+        {
+            return _peopleRepository.DeleteOrphanedCredits();
+        }
+
        /// <inheritdoc/>
        public IReadOnlyDictionary<Guid, IReadOnlyList<string>> GetPeopleNamesByItems(IReadOnlyList<Guid> itemIds, IReadOnlyList<string> personTypes)
        {
@@ -3595,7 +3691,20 @@ namespace Emby.Server.Implementations.Library

                    await item.UpdateToRepositoryAsync(ItemUpdateType.ImageUpdate, CancellationToken.None).ConfigureAwait(false);

-                    return item.GetImageInfo(image.Type, imageIndex);
+                    var localImage = item.GetImageInfo(image.Type, imageIndex);
+                    if (localImage is null)
+                    {
+                        throw new InvalidOperationException(string.Format(
+                            CultureInfo.InvariantCulture,
+                            "Downloaded {0} image {1} from {2} is not attached to {3} ({4})",
+                            image.Type,
+                            imageIndex,
+                            url,
+                            item.Name,
+                            item.Id));
+                    }
+
+                    return localImage;
                }
                catch (HttpRequestException ex)
                {
@@ -3617,7 +3726,13 @@ namespace Emby.Server.Implementations.Library
                await item.UpdateToRepositoryAsync(ItemUpdateType.ImageUpdate, CancellationToken.None).ConfigureAwait(false);
            }

-            throw new InvalidOperationException("Unable to convert any images to local");
+            throw new InvalidOperationException(string.Format(
+                CultureInfo.InvariantCulture,
+                "Unable to convert any {0} image url in \"{1}\" to a local file for {2} ({3})",
+                image.Type,
+                image.Path,
+                item.Name,
+                item.Id));
        }

        public async Task AddVirtualFolder(string name, CollectionTypeOptions? collectionType, LibraryOptions options, bool refreshLibrary)
@@ -3673,6 +3788,10 @@ namespace Emby.Server.Implementations.Library
                        AddMediaPathInternal(name, path, false);
                    }
                }
+
+                // The libraries root was listed before this folder existed, so drop that listing:
+                // anything still reading it resolves the library set without the new folder.
+                _directoryService.Invalidate(virtualFolderPath);
            }
            finally
            {
@@ -3699,27 +3818,14 @@ namespace Emby.Server.Implementations.Library

                var itemUpdateType = ItemUpdateType.MetadataDownload;
                var saveEntity = false;
-                var createEntity = false;
                var personEntity = GetPerson(person.Name);

                if (personEntity is null)
                {
                    try
                    {
-                        var path = Person.GetPath(person.Name);
-                        var info = Directory.CreateDirectory(path);
-                        personEntity = new Person()
-                        {
-                            Name = person.Name,
-                            Id = GetItemByNameId<Person>(path),
-                            DateCreated = info.CreationTimeUtc,
-                            DateModified = info.LastWriteTimeUtc,
-                            Path = path
-                        };
-
-                        personEntity.PresentationUniqueKey = personEntity.CreatePresentationUniqueKey();
+                        personEntity = GetOrCreatePerson(person.Name);
                        saveEntity = true;
-                        createEntity = true;
                    }
                    catch (Exception ex)
                    {
@@ -3753,11 +3859,6 @@ namespace Emby.Server.Implementations.Library

                if (saveEntity)
                {
-                    if (createEntity)
-                    {
-                        CreateItems([personEntity], null, CancellationToken.None);
-                    }
-
                    await RunMetadataSavers(personEntity, itemUpdateType).ConfigureAwait(false);
                    personEntity.DateLastSaved = DateTime.UtcNow;

@@ -3797,7 +3898,9 @@ namespace Emby.Server.Implementations.Library
            }

            var rootFolderPath = _configurationManager.ApplicationPaths.DefaultUserViewsPath;
-            var virtualFolderPath = Path.Combine(rootFolderPath, virtualFolderName);
+            var virtualFolderPath = FileSystemHelper.GetChildPath(rootFolderPath, virtualFolderName)
+                ?? throw new FileNotFoundException(
+                    string.Format(CultureInfo.InvariantCulture, "The media collection {0} does not exist", virtualFolderName));

            CreateShortcut(virtualFolderPath, pathInfo);

@@ -3818,7 +3921,9 @@ namespace Emby.Server.Implementations.Library
            ArgumentNullException.ThrowIfNull(mediaPath);

            var rootFolderPath = _configurationManager.ApplicationPaths.DefaultUserViewsPath;
-            var virtualFolderPath = Path.Combine(rootFolderPath, virtualFolderName);
+            var virtualFolderPath = FileSystemHelper.GetChildPath(rootFolderPath, virtualFolderName)
+                ?? throw new FileNotFoundException(
+                    string.Format(CultureInfo.InvariantCulture, "The media collection {0} does not exist", virtualFolderName));

            var libraryOptions = CollectionFolder.GetLibraryOptions(virtualFolderPath);

@@ -3857,9 +3962,9 @@ namespace Emby.Server.Implementations.Library

            var rootFolderPath = _configurationManager.ApplicationPaths.DefaultUserViewsPath;

-            var path = Path.Combine(rootFolderPath, name);
+            var path = FileSystemHelper.GetChildPath(rootFolderPath, name);

-            if (!Directory.Exists(path))
+            if (path is null || !Directory.Exists(path))
            {
                throw new FileNotFoundException("The media folder does not exist");
            }
@@ -3869,6 +3974,7 @@ namespace Emby.Server.Implementations.Library
            try
            {
                Directory.Delete(path, true);
+                _directoryService.Invalidate(path);
            }
            finally
            {
@@ -3923,9 +4029,9 @@ namespace Emby.Server.Implementations.Library
            ArgumentException.ThrowIfNullOrEmpty(mediaPath);

            var rootFolderPath = _configurationManager.ApplicationPaths.DefaultUserViewsPath;
-            var virtualFolderPath = Path.Combine(rootFolderPath, virtualFolderName);
+            var virtualFolderPath = FileSystemHelper.GetChildPath(rootFolderPath, virtualFolderName);

-            if (!Directory.Exists(virtualFolderPath))
+            if (virtualFolderPath is null || !Directory.Exists(virtualFolderPath))
            {
                throw new FileNotFoundException(
                    string.Format(CultureInfo.InvariantCulture, "The media collection {0} does not exist", virtualFolderName));
@@ -3938,6 +4044,7 @@ namespace Emby.Server.Implementations.Library
            if (!string.IsNullOrEmpty(shortcut))
            {
                _fileSystem.DeleteFile(shortcut);
+                _directoryService.Invalidate(shortcut);
            }

            var libraryOptions = CollectionFolder.GetLibraryOptions(virtualFolderPath);
@@ -3981,6 +4088,7 @@ namespace Emby.Server.Implementations.Library
            }

            _fileSystem.CreateShortcut(lnk, _appHost.ReverseVirtualPath(path));
+            _directoryService.Invalidate(lnk);
            RemoveContentTypeOverrides(path);
        }

@@ -99,7 +99,7 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
                        args.LibraryOptions.SeasonZeroDisplayName :
                        string.Format(
                            CultureInfo.InvariantCulture,
-                            _localization.GetLocalizedString("NameSeasonNumber"),
+                            _localization.GetServerLocalizedString("NameSeasonNumber"),
                            seasonNumber,
                            args.LibraryOptions.PreferredMetadataLanguage);
                }
@@ -129,6 +129,17 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV

            var tmdbId = justName.GetAttributeValue("tmdbid");
            item.TrySetProviderId(MetadataProvider.Tmdb, tmdbId);
+
+            // Anime databases model a single cour as its own entry, so a multi-season
+            // series maps to one of these ids per season rather than one per series.
+            var anidbId = justName.GetAttributeValue("anidbid");
+            item.TrySetProviderId("AniDB", anidbId);
+
+            var aniListId = justName.GetAttributeValue("anilistid");
+            item.TrySetProviderId("AniList", aniListId);
+
+            var aniSearchId = justName.GetAttributeValue("anisearchid");
+            item.TrySetProviderId("AniSearch", aniSearchId);
        }
    }
 }
@@ -112,13 +112,12 @@ public class SearchManager : ISearchManager
            return externalResults;
        }

-        var internalResults = await internalTask.ConfigureAwait(false);
        if (_internalProviders.Length > 0)
        {
            _logger.LogDebug("No results from external providers, using internal provider results");
        }

-        return internalResults;
+        return await internalTask.ConfigureAwait(false);
    }

    private async Task<IReadOnlyList<SearchResult>> FilterByUserAccessAsync(
@@ -144,17 +143,16 @@ public class SearchManager : ISearchManager

            baseQuery = _queryHelpers.ApplyAccessFiltering(dbContext, baseQuery, accessFilter);

-            var allowedCount = await baseQuery.CountAsync(cancellationToken).ConfigureAwait(false);
-            if (allowedCount == candidates.Count)
-            {
-                return candidates;
-            }
-
            var allowedIds = await baseQuery
                .Select(e => e.Id)
                .ToHashSetAsync(cancellationToken)
                .ConfigureAwait(false);

+            if (allowedIds.Count == candidates.Count)
+            {
+                return candidates;
+            }
+
            var filtered = candidates.Where(c => allowedIds.Contains(c.ItemId)).ToList();
            if (filtered.Count < candidates.Count)
            {
@@ -260,7 +260,7 @@ public sealed class MovieSimilarItemsProvider : ILocalSimilarItemsProvider<Movie
            }

            var candidateRows = await context.ItemValuesMap.AsNoTracking()
-                .Where(m => m.ItemValue.Type == valueType && allKeys.Contains(m.ItemValue.CleanValue))
+                .Where(m => !m.Item.PrimaryVersionId.HasValue && m.ItemValue.Type == valueType && allKeys.Contains(m.ItemValue.CleanValue))
                .Select(m => new { m.ItemId, Key = m.ItemValue.CleanValue })
                .ToListAsync(cancellationToken).ConfigureAwait(false);

@@ -276,6 +276,7 @@ public sealed class MovieSimilarItemsProvider : ILocalSimilarItemsProvider<Movie
        if (personSourceRows.Count > 0)
        {
            var personCandidateRows = await context.PeopleBaseItemMap.AsNoTracking()
+                .Where(m => !m.Item.PrimaryVersionId.HasValue)
                .Where(m => context.PeopleBaseItemMap
                    .Where(s => sourceIds.Contains(s.ItemId) && _scoredPersonTypes.Contains(s.People.PersonType))
                    .Select(s => s.PeopleId)
@@ -0,0 +1,42 @@
+using Jellyfin.Data.Enums;
+using Jellyfin.Database.Implementations.Entities;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Library;
+
+namespace Emby.Server.Implementations.Library.SimilarItems;
+
+/// <summary>
+/// Builds the access filter that decides which items a similar-items lookup may return for a user.
+/// </summary>
+internal static class SimilarItemsAccessFilter
+{
+    private static readonly BaseItemKind[] _itemByNameKinds =
+    [
+        BaseItemKind.Person,
+        BaseItemKind.Genre,
+        BaseItemKind.MusicGenre,
+        BaseItemKind.MusicArtist,
+        BaseItemKind.Studio
+    ];
+
+    /// <summary>
+    /// Builds an access filter carrying the user's library access and parental restrictions.
+    /// </summary>
+    /// <param name="user">The user the lookup runs for.</param>
+    /// <param name="libraryManager">The library manager.</param>
+    /// <returns>The access filter.</returns>
+    public static InternalItemsQuery Build(User user, ILibraryManager libraryManager)
+    {
+        // IncludeItemTypes is read only for the by-name exemption here; the caller applies this
+        // filter through ApplyAccessFiltering, which does not translate it into a type restriction.
+        var accessFilter = new InternalItemsQuery(user)
+        {
+            IncludeItemTypes = _itemByNameKinds
+        };
+
+        // ConfigureUserAccess populates TopParentIds for the libraries the user may open.
+        libraryManager.ConfigureUserAccess(accessFilter, user);
+
+        return accessFilter;
+    }
+}
@@ -7,8 +7,10 @@ using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
 using Jellyfin.Data.Enums;
+using Jellyfin.Database.Implementations;
 using Jellyfin.Database.Implementations.Entities;
 using Jellyfin.Database.Implementations.Enums;
+using Jellyfin.Extensions;
 using Jellyfin.Extensions.Json;
 using MediaBrowser.Common.Extensions;
 using MediaBrowser.Controller;
@@ -16,11 +18,13 @@ using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Dto;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Library;
+using MediaBrowser.Controller.Persistence;
 using MediaBrowser.Model.Configuration;
 using MediaBrowser.Model.Dto;
 using MediaBrowser.Model.Entities;
 using MediaBrowser.Model.IO;
 using MediaBrowser.Model.Querying;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;

 namespace Emby.Server.Implementations.Library.SimilarItems;
@@ -35,6 +39,8 @@ public class SimilarItemsManager : ISimilarItemsManager
    private readonly ILibraryManager _libraryManager;
    private readonly IFileSystem _fileSystem;
    private readonly IServerConfigurationManager _serverConfigurationManager;
+    private readonly IDbContextFactory<JellyfinDbContext> _dbProvider;
+    private readonly IItemQueryHelpers _queryHelpers;
    private ISimilarItemsProvider[] _similarItemsProviders = [];

    /// <summary>
@@ -45,18 +51,24 @@ public class SimilarItemsManager : ISimilarItemsManager
    /// <param name="libraryManager">The library manager.</param>
    /// <param name="fileSystem">The file system.</param>
    /// <param name="serverConfigurationManager">The server configuration manager.</param>
+    /// <param name="dbProvider">The database context factory.</param>
+    /// <param name="queryHelpers">The shared item query helpers.</param>
    public SimilarItemsManager(
        ILogger<SimilarItemsManager> logger,
        IServerApplicationPaths appPaths,
        ILibraryManager libraryManager,
        IFileSystem fileSystem,
-        IServerConfigurationManager serverConfigurationManager)
+        IServerConfigurationManager serverConfigurationManager,
+        IDbContextFactory<JellyfinDbContext> dbProvider,
+        IItemQueryHelpers queryHelpers)
    {
        _logger = logger;
        _appPaths = appPaths;
        _libraryManager = libraryManager;
        _fileSystem = fileSystem;
        _serverConfigurationManager = serverConfigurationManager;
+        _dbProvider = dbProvider;
+        _queryHelpers = queryHelpers;
    }

    /// <inheritdoc/>
@@ -230,11 +242,64 @@ public class SimilarItemsManager : ISimilarItemsManager
            }
        }

-        return allResults
+        var ordered = allResults
            .OrderByDescending(x => x.Score)
            .Select(x => x.Item)
            .Take(requestedLimit)
            .ToList();
+
+        return await FilterByLibraryAccessAsync(ordered, user, cancellationToken).ConfigureAwait(false);
+    }
+
+    private async Task<IReadOnlyList<BaseItem>> FilterByLibraryAccessAsync(
+        IReadOnlyList<BaseItem> candidates,
+        User? user,
+        CancellationToken cancellationToken)
+    {
+        if (candidates.Count == 0 || user is null)
+        {
+            return candidates;
+        }
+
+        var accessFilter = SimilarItemsAccessFilter.Build(user, _libraryManager);
+
+        // No accessible libraries means nothing to compare against, and an empty TopParentIds set
+        // would disable the filter rather than reject everything.
+        if (accessFilter.TopParentIds.Length == 0)
+        {
+            return candidates;
+        }
+
+        Guid[] candidateIds = [.. candidates.Select(c => c.Id)];
+
+        var dbContext = await _dbProvider.CreateDbContextAsync(cancellationToken).ConfigureAwait(false);
+        await using (dbContext.ConfigureAwait(false))
+        {
+            var baseQuery = dbContext.BaseItems
+                .AsNoTracking()
+                .WhereOneOrMany(candidateIds, e => e.Id);
+
+            baseQuery = _queryHelpers.ApplyAccessFiltering(dbContext, baseQuery, accessFilter);
+
+            var allowedCount = await baseQuery.CountAsync(cancellationToken).ConfigureAwait(false);
+            if (allowedCount == candidates.Count)
+            {
+                return candidates;
+            }
+
+            var allowedIds = await baseQuery
+                .Select(e => e.Id)
+                .ToHashSetAsync(cancellationToken)
+                .ConfigureAwait(false);
+
+            var filtered = candidates.Where(c => allowedIds.Contains(c.Id)).ToList();
+            _logger.LogDebug(
+                "Dropped {Dropped} of {Total} similar-item candidates due to user access filtering",
+                candidates.Count - filtered.Count,
+                candidates.Count);
+
+            return filtered;
+        }
    }

    /// <inheritdoc/>
@@ -376,19 +441,39 @@ public class SimilarItemsManager : ISimilarItemsManager

        var batchResults = await batchProvider.GetBatchSimilarItemsAsync(baselineItems, query, cancellationToken).ConfigureAwait(false);

+        // Filter once across every category rather than per baseline, so a batch provider costs one
+        // access query no matter how many categories it produced.
+        var allItems = batchResults.Values.SelectMany(items => items).DistinctBy(item => item.Id).ToList();
+        var allowed = await FilterByLibraryAccessAsync(allItems, query.User, cancellationToken).ConfigureAwait(false);
+
+        HashSet<Guid>? allowedIds = allowed.Count == allItems.Count
+            ? null
+            : [.. allowed.Select(item => item.Id)];
+
        var recommendations = new List<SimilarItemsRecommendation>(baselineItems.Count);
        foreach (var baseline in baselineItems)
        {
-            if (batchResults.TryGetValue(baseline.Id, out var similar) && similar.Count > 0)
+            if (!batchResults.TryGetValue(baseline.Id, out var similar) || similar.Count == 0)
            {
-                recommendations.Add(new SimilarItemsRecommendation
-                {
-                    BaselineItemName = baseline.Name,
-                    CategoryId = baseline.Id,
-                    RecommendationType = recommendationType,
-                    Items = similar
-                });
+                continue;
            }
+
+            if (allowedIds is not null)
+            {
+                similar = similar.Where(item => allowedIds.Contains(item.Id)).ToList();
+                if (similar.Count == 0)
+                {
+                    continue;
+                }
+            }
+
+            recommendations.Add(new SimilarItemsRecommendation
+            {
+                BaselineItemName = baseline.Name,
+                CategoryId = baseline.Id,
+                RecommendationType = recommendationType,
+                Items = similar
+            });
        }

        return recommendations;
@@ -112,7 +112,7 @@ namespace Emby.Server.Implementations.Library

            if (_config.Configuration.EnableFolderView)
            {
-                var name = _localizationManager.GetLocalizedString("Folders");
+                var name = _localizationManager.GetServerLocalizedString("Folders");
                list.Add(_libraryManager.GetNamedView(name, CollectionType.folders, string.Empty));
            }

@@ -168,7 +168,7 @@ namespace Emby.Server.Implementations.Library

        public UserView GetUserSubView(Guid parentId, CollectionType? type, string localizationKey, string sortName)
        {
-            var name = _localizationManager.GetLocalizedString(localizationKey);
+            var name = _localizationManager.GetServerLocalizedString(localizationKey);

            return GetUserSubViewWithName(name, parentId, type, sortName);
        }
@@ -191,7 +191,7 @@ namespace Emby.Server.Implementations.Library
                return GetUserView((Folder)parents[0], viewType, string.Empty);
            }

-            var name = _localizationManager.GetLocalizedString(localizationKey);
+            var name = _localizationManager.GetServerLocalizedString(localizationKey);
            return _libraryManager.GetNamedView(user, name, viewType, sortName);
        }

@@ -396,6 +396,12 @@ namespace Emby.Server.Implementations.Library
                    query.Limit = limit;
                    return _libraryManager.GetLatestItemList(query, parents, CollectionType.movies);
                }
+
+                if (collectionType is null)
+                {
+                    query.Limit = limit;
+                    return _libraryManager.GetLatestItemList(query, parents, CollectionType.unknown);
+                }
            }

            return _libraryManager.GetItemList(query, parents);
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
 using System.Threading;
@@ -61,6 +62,9 @@ public class ArtistsValidator
        var count = names.Count;
        var refreshed = 0;

+        var liveIds = new HashSet<Guid>();
+        var unresolved = 0;
+
        foreach (var name in names)
        {
            try
@@ -73,13 +77,20 @@ public class ArtistsValidator

                // Fall back to GetArtist if not found (creates new item if needed)
                item ??= _libraryManager.GetArtist(name);
-                var isNew = !existingArtistIds.Contains(item.Id);
-                var neverRefreshed = item.DateLastRefreshed == default;

-                if (isNew || neverRefreshed)
+                // A name with no item is nothing to refresh, and nothing to keep alive either.
+                if (item is not null)
                {
-                    await item.RefreshMetadata(cancellationToken).ConfigureAwait(false);
-                    refreshed++;
+                    liveIds.Add(item.Id);
+
+                    var isNew = !existingArtistIds.Contains(item.Id);
+                    var neverRefreshed = item.DateLastRefreshed == default;
+
+                    if (isNew || neverRefreshed)
+                    {
+                        await item.RefreshMetadata(cancellationToken).ConfigureAwait(false);
+                        refreshed++;
+                    }
                }
            }
            catch (OperationCanceledException)
@@ -88,6 +99,7 @@ public class ArtistsValidator
            }
            catch (Exception ex)
            {
+                unresolved++;
                _logger.LogError(ex, "Error refreshing {ArtistName}", name);
            }

@@ -101,13 +113,26 @@ public class ArtistsValidator

        _logger.LogInformation("Refreshed metadata for {RefreshedCount} new artists out of {TotalCount} total", refreshed, count);

+        // Every name that threw is a name whose artist is missing from the live set, and deleting against
+        // a live set with holes in it deletes artists the library still refers to. Leave the sweep to a
+        // run that got a clean read of them.
+        if (unresolved > 0)
+        {
+            _logger.LogWarning(
+                "Not removing dead artists: {Count} of {TotalCount} names could not be resolved this run",
+                unresolved,
+                count);
+
+            progress.Report(100);
+            return;
+        }
+
        var deadEntities = _libraryManager.GetItemList(new InternalItemsQuery
        {
            IncludeItemTypes = [BaseItemKind.MusicArtist],
-            IsDeadArtist = true,
            IsLocked = false
-        }).Cast<MusicArtist>()
-        .Where(item => item.IsAccessedByName)
+        }).OfType<MusicArtist>()
+        .Where(item => item.IsAccessedByName && !liveIds.Contains(item.Id))
        .ToList();

        foreach (var item in deadEntities)
@@ -1,12 +1,12 @@
 using System;
+using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Jellyfin.Data.Enums;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Library;
-using MediaBrowser.Controller.Providers;
-using MediaBrowser.Model.IO;
 using Microsoft.Extensions.Logging;

 namespace Emby.Server.Implementations.Library.Validators;
@@ -17,104 +17,143 @@ namespace Emby.Server.Implementations.Library.Validators;
 public class PeopleValidator
 {
    /// <summary>
-    /// The _library manager.
+    /// The library manager.
    /// </summary>
    private readonly ILibraryManager _libraryManager;

    /// <summary>
-    /// The _logger.
+    /// The logger.
    /// </summary>
-    private readonly ILogger _logger;
-
-    private readonly IFileSystem _fileSystem;
+    private readonly ILogger<PeopleValidator> _logger;

    /// <summary>
    /// Initializes a new instance of the <see cref="PeopleValidator" /> class.
    /// </summary>
    /// <param name="libraryManager">The library manager.</param>
    /// <param name="logger">The logger.</param>
-    /// <param name="fileSystem">The file system.</param>
-    public PeopleValidator(ILibraryManager libraryManager, ILogger logger, IFileSystem fileSystem)
+    public PeopleValidator(ILibraryManager libraryManager, ILogger<PeopleValidator> logger)
    {
        _libraryManager = libraryManager;
        _logger = logger;
-        _fileSystem = fileSystem;
    }

    /// <summary>
    /// Validates the people.
    /// </summary>
-    /// <param name="cancellationToken">The cancellation token.</param>
    /// <param name="progress">The progress.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
    /// <returns>Task.</returns>
-    public async Task ValidatePeople(CancellationToken cancellationToken, IProgress<double> progress)
+    public async Task Run(IProgress<double> progress, CancellationToken cancellationToken)
    {
-        var people = _libraryManager.GetPeopleNames(new InternalPeopleQuery());
+        // Before the refresh below walks them: a credit no item maps to any more stands for nothing,
+        // and while it is there the person it names cannot reach the dead-person sweep either.
+        var numOrphaned = _libraryManager.DeleteOrphanedCredits();
+        if (numOrphaned > 0)
+        {
+            _logger.LogInformation("Deleted {Amount} credits no item maps to", numOrphaned);
+        }
+
+        var names = _libraryManager.GetPeopleNames(new InternalPeopleQuery());
+        var existingPersonIds = _libraryManager.GetItemIds(new InternalItemsQuery
+        {
+            IncludeItemTypes = [BaseItemKind.Person]
+        }).ToHashSet();
+
+        var (newNames, deadIds) = PartitionCreditsByPersonId(names, _libraryManager.GetPersonId, existingPersonIds);

        var numComplete = 0;
+        var count = names.Count;
+        var refreshed = 0;

-        var numPeople = people.Count;
-
-        IProgress<double> subProgress = new Progress<double>((val) => progress.Report(val / 2));
-
-        _logger.LogDebug("Will refresh {Amount} people", numPeople);
-
-        foreach (var person in people)
+        foreach (var name in names)
        {
            cancellationToken.ThrowIfCancellationRequested();

            try
            {
-                var item = _libraryManager.GetPerson(person);
-                if (item is null)
+                var item = _libraryManager.GetOrCreatePerson(name);
+                var isNew = !existingPersonIds.Contains(item.Id);
+                var neverRefreshed = item.DateLastRefreshed == default;
+
+                if (isNew || neverRefreshed)
                {
-                    _logger.LogWarning("Failed to get person: {Name}", person);
-                    continue;
+                    await item.RefreshMetadata(cancellationToken).ConfigureAwait(false);
+                    refreshed++;
                }
-
-                var options = new MetadataRefreshOptions(new DirectoryService(_fileSystem))
-                {
-                    ImageRefreshMode = MetadataRefreshMode.ValidationOnly,
-                    MetadataRefreshMode = MetadataRefreshMode.ValidationOnly
-                };
-
-                await item.RefreshMetadata(options, cancellationToken).ConfigureAwait(false);
            }
            catch (OperationCanceledException)
            {
+                // Don't clutter the log
                throw;
            }
            catch (Exception ex)
            {
-                _logger.LogError(ex, "Error validating IBN entry {Person}", person);
+                _logger.LogError(ex, "Error refreshing {PersonName}", name);
            }

-            // Update progress
            numComplete++;
            double percent = numComplete;
-            percent /= numPeople;
+            percent /= count;
+            percent *= 100;

-            subProgress.Report(100 * percent);
+            progress.Report(percent);
        }

-        var deadEntities = _libraryManager.GetItemList(new InternalItemsQuery
-        {
-            IncludeItemTypes = [BaseItemKind.Person],
-            IsDeadPerson = true,
-            IsLocked = false
-        });
+        _logger.LogInformation(
+            "Refreshed metadata for {RefreshedCount} people out of {TotalCount} total, {NewCount} of which had no item yet",
+            refreshed,
+            count,
+            newNames.Count);

-        subProgress = new Progress<double>((val) => progress.Report((val / 2) + 50));
+        // A person somebody locked is theirs, not ours, however little the library still credits them.
+        var deadEntities = deadIds
+            .Select(_libraryManager.GetItemById)
+            .OfType<Person>()
+            .Where(item => !item.IsLocked)
+            .ToList();

-        var i = 0;
-        foreach (var item in deadEntities.Chunk(500))
+        foreach (var item in deadEntities)
        {
-            _libraryManager.DeleteItemsUnsafeFast(item, true);
-            subProgress.Report(100f / deadEntities.Count * (i++ * 100));
+            _logger.LogInformation("Deleting dead {ItemType} {ItemId} {ItemName}", item.GetType().Name, item.Id.ToString("N", CultureInfo.InvariantCulture), item.Name);
        }

+        _libraryManager.DeleteItemsUnsafeFast(deadEntities, deleteSourceFiles: true);
+
        progress.Report(100);
+    }

-        _logger.LogInformation("People validation complete");
+    /// <summary>
+    /// Splits the person items into the ones a credit still calls for and the ones nothing does.
+    /// </summary>
+    /// <param name="creditNames">Every name credited on an item, from the people table.</param>
+    /// <param name="getPersonId">Maps a credit name to the id its person item has.</param>
+    /// <param name="existingPersonIds">The ids of the person items that exist.</param>
+    /// <returns>The credits needing an item, and the ids of the items nothing credits.</returns>
+    internal static (List<string> NewNames, List<Guid> DeadIds) PartitionCreditsByPersonId(
+        IReadOnlyList<string> creditNames,
+        Func<string, Guid> getPersonId,
+        IReadOnlySet<Guid> existingPersonIds)
+    {
+        ArgumentNullException.ThrowIfNull(creditNames);
+        ArgumentNullException.ThrowIfNull(getPersonId);
+        ArgumentNullException.ThrowIfNull(existingPersonIds);
+
+        var newNames = new List<string>();
+        var liveIds = new HashSet<Guid>();
+
+        foreach (var name in creditNames)
+        {
+            var personId = getPersonId(name);
+
+            // Distinct credit names can normalize onto one id; only the first of them needs an item.
+            if (liveIds.Add(personId) && !existingPersonIds.Contains(personId))
+            {
+                newNames.Add(name);
+            }
+        }
+
+        var deadIds = existingPersonIds.Where(id => !liveIds.Contains(id)).ToList();
+
+        return (newNames, deadIds);
    }
 }
@@ -106,5 +106,17 @@
    "TaskExtractMediaSegments": "Сканіраванне медыя-сегмента",
    "TaskMoveTrickplayImages": "Перанесці месцазнаходжанне выявы Trickplay",
    "CleanupUserDataTask": "Задача па ачыстцы даных карыстальніка",
-    "CleanupUserDataTaskDescription": "Ачышчае ўсе даныя карыстальніка (стан прагляду, абранае і г.д.) для медыяфайлаў, што адсутнічаюць больш за 90 дзён."
+    "CleanupUserDataTaskDescription": "Ачышчае ўсе даныя карыстальніка (стан прагляду, абранае і г.д.) для медыяфайлаў, што адсутнічаюць больш за 90 дзён.",
+    "LyricDownloadFailureFromForItem": "Не ўдалося загрузіць тэкст песні з {0} для {1}",
+    "NameExtraDeletedScene": "Выдаленая сцэна",
+    "NameExtraInterview": "Інтэрв'ю",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraScene": "Сцэна",
+    "NameExtraTrailer": "Трэйлер",
+    "NameExtraBehindTheScenes": "За кулісамі",
+    "NameExtraClip": "Кліп",
+    "NameExtraFeaturette": "Кароткаметражка",
+    "NameExtraSample": "Прыклад",
+    "NameExtraShort": "Кароткаметражка",
+    "NameExtraThemeSong": "Тэматычная песня"
 }
@@ -106,5 +106,20 @@
    "TaskMoveTrickplayImagesDescription": "Премества съществуващите trickplay изображения спрямо настройките на библиотеката.",
    "TaskExtractMediaSegments": "Сканиране за сегменти",
    "CleanupUserDataTask": "Задача за почистване на потребителски данни",
-    "CleanupUserDataTaskDescription": "Почиства всички потребителски данни (статус на гледане, любими и т.н.) от медия, която вече не е налична от поне 90 дни."
+    "CleanupUserDataTaskDescription": "Почиства всички потребителски данни (статус на гледане, любими и т.н.) от медия, която вече не е налична от поне 90 дни.",
+    "LyricDownloadFailureFromForItem": "Текстът на песента не успя да се изтегли от {0} за {1}",
+    "NameExtraBehindTheScenes": "Зад кулисите",
+    "NameExtraScene": "Сцена",
+    "NameExtraShort": "Откъс",
+    "NameExtraThemeVideo": "Тематично видео",
+    "NameExtraTrailer": "Трейлър",
+    "NameExtraUnknown": "Екстра",
+    "NameExtraClip": "Клип",
+    "NameExtraDeletedScene": "Изтрита Сцена",
+    "NameExtraFeaturette": "Кратък филм",
+    "NameExtraInterview": "Интервю",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Пример",
+    "NameExtraThemeSong": "Тема-песен",
+    "Original": "Оригинал"
 }
@@ -106,5 +106,17 @@
    "TaskMoveTrickplayImages": "Migracija lokacije slike Trickplay",
    "TaskMoveTrickplayImagesDescription": "Premješta postojeće datoteke trik-igara prema postavkama biblioteke.",
    "CleanupUserDataTask": "Zadatak čišćenja korisničkih podataka",
-    "CleanupUserDataTaskDescription": "Čisti sve korisničke podatke (stanje praćenja, status omiljenog itd.) sa medija koji više nije prisutan najmanje 90 dana."
+    "CleanupUserDataTaskDescription": "Čisti sve korisničke podatke (stanje praćenja, status omiljenog itd.) sa medija koji više nije prisutan najmanje 90 dana.",
+    "NameExtraBehindTheScenes": "Iza kulisa",
+    "NameExtraClip": "Isječak",
+    "NameExtraDeletedScene": "Izbrišana scena",
+    "NameExtraFeaturette": "Kratki prilog",
+    "NameExtraInterview": "Intervju",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Uzorak",
+    "NameExtraScene": "Scena",
+    "NameExtraShort": "Kratko",
+    "NameExtraThemeSong": "Tema",
+    "NameExtraThemeVideo": "Tematski video",
+    "NameExtraTrailer": "Najava"
 }
@@ -51,7 +51,7 @@
    "Shows": "Serier",
    "StartupEmbyServerIsLoading": "Jellyfin er i gang med at starte. Prøv igen om et øjeblik.",
    "SubtitleDownloadFailureFromForItem": "Undertekster kunne ikke hentes fra {0} til {1}",
-    "TvShows": "TV-serier",
+    "TvShows": "Serier",
    "UserCreatedWithName": "Bruger {0} er blevet oprettet",
    "UserDeletedWithName": "Brugeren {0} er nu slettet",
    "UserDownloadingItemWithValues": "{0} henter {1}",
@@ -80,8 +80,8 @@
    "TaskRefreshChapterImagesDescription": "Laver miniaturebilleder for videoer, der har kapitler.",
    "TaskRefreshChannelsDescription": "Opdaterer information for internetkanaler.",
    "TaskRefreshChannels": "Opdatér kanaler",
-    "TaskCleanTranscodeDescription": "Fjerner omkodningsfiler, som er mere end 1 dag gamle.",
-    "TaskCleanTranscode": "Tøm omkodningsmappen",
+    "TaskCleanTranscodeDescription": "Fjerner transkodningsfiler, som er mere end 1 dag gamle.",
+    "TaskCleanTranscode": "Tøm transkodningsmappen",
    "TaskRefreshPeople": "Opdatér personer",
    "TaskRefreshPeopleDescription": "Opdaterer metadata for skuespillere og instruktører i dit mediebibliotek.",
    "TaskCleanActivityLogDescription": "Sletter linjer i aktivitetsloggen ældre end den konfigurerede alder.",
@@ -109,17 +109,17 @@
    "CleanupUserDataTaskDescription": "Rydder alle brugerdata (eks. visning- og favoritstatus) fra medier, der har været utilgængelige i mindst 90 dage.",
    "LyricDownloadFailureFromForItem": "Sangtekster kunne ikke downloades fra {0} til {1}",
    "Original": "Original",
-    "NameExtraBehindTheScenes": "Bag Scenerne",
+    "NameExtraBehindTheScenes": "Bag scenerne",
    "NameExtraClip": "Klip",
-    "NameExtraDeletedScene": "Slettet Scene",
+    "NameExtraDeletedScene": "Slettet scene",
    "NameExtraFeaturette": "Featurette",
    "NameExtraInterview": "Interview",
    "NameExtraNumbered": "{0} {1}",
    "NameExtraSample": "Smagsprøve",
    "NameExtraScene": "Scene",
    "NameExtraShort": "Kort",
-    "NameExtraThemeSong": "Tema Sang",
-    "NameExtraThemeVideo": "Tema Video",
+    "NameExtraThemeSong": "Temasang",
+    "NameExtraThemeVideo": "Temavideo",
    "NameExtraTrailer": "Trailer",
    "NameExtraUnknown": "Ekstra"
 }
@@ -1,6 +1,6 @@
 {
    "AppDeviceValues": "App: {0}, Gerät: {1}",
-    "Artists": "Interpreten",
+    "Artists": "Künstler",
    "AuthenticationSucceededWithUserName": "{0} erfolgreich authentifiziert",
    "Books": "Bücher",
    "ChapterNameValue": "Kapitel {0}",
@@ -108,5 +108,18 @@
    "CleanupUserDataTaskDescription": "Καθαρίζει όλα τα δεδομένα χρήστη (κατάσταση παρακολούθησης, κατάσταση αγαπημένων κ.λπ.) από πολυμέσα που δεν υπάρχουν πλέον για τουλάχιστον 90 ημέρες.",
    "CleanupUserDataTask": "Εργασία εκκαθάρισης δεδομένων χρήστη",
    "LyricDownloadFailureFromForItem": "Αποτυχία λήψης στίχων από {0} για {1}",
-    "Original": "Πρωτότυπο"
+    "Original": "Πρωτότυπο",
+    "NameExtraBehindTheScenes": "Πίσω από τις Σκηνές",
+    "NameExtraDeletedScene": "Διεγραμμένη Σκηνή",
+    "NameExtraFeaturette": "Πρόσθετα βίντεο",
+    "NameExtraInterview": "Συνέντευξη",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Δείγμα",
+    "NameExtraScene": "Σκηνή",
+    "NameExtraShort": "Βίντεο μικρού μήκους",
+    "NameExtraThemeSong": "Θεματικό Τραγούδι",
+    "NameExtraThemeVideo": "Θεματικό Βίντεο",
+    "NameExtraTrailer": "τρέιλερ ταινίας",
+    "NameExtraUnknown": "Πρόσθετα",
+    "NameExtraClip": "Απόσπασμα"
 }
@@ -24,8 +24,8 @@
    "Music": "Music",
    "MusicVideos": "Music Videos",
    "NameInstallFailed": "{0} installation failed",
-    "NameSeasonNumber": "Season {0}",
-    "NameSeasonUnknown": "Season Unknown",
+    "NameSeasonNumber": "Series {0}",
+    "NameSeasonUnknown": "Series Unknown",
    "NewVersionIsAvailable": "A new version of Jellyfin Server is available for download.",
    "NotificationOptionApplicationUpdateAvailable": "Application update available",
    "NotificationOptionApplicationUpdateInstalled": "Application update installed",
@@ -108,5 +108,18 @@
    "CleanupUserDataTask": "User data cleanup task",
    "CleanupUserDataTaskDescription": "Cleans all user data (Watch state, favourite status etc) from media that is no longer present for at least 90 days.",
    "LyricDownloadFailureFromForItem": "Lyrics failed to download from {0} for {1}",
-    "Original": "Original"
+    "Original": "Original",
+    "NameExtraBehindTheScenes": "Behind The Scenes",
+    "NameExtraClip": "Clip",
+    "NameExtraDeletedScene": "Deleted Scene",
+    "NameExtraFeaturette": "Featurette",
+    "NameExtraInterview": "Interview",
+    "NameExtraSample": "Sample",
+    "NameExtraScene": "Scene",
+    "NameExtraShort": "Short",
+    "NameExtraThemeSong": "Theme Song",
+    "NameExtraThemeVideo": "Theme Video",
+    "NameExtraTrailer": "Trailer",
+    "NameExtraUnknown": "Extra",
+    "NameExtraNumbered": "{0} {1}"
 }
@@ -97,5 +97,9 @@
    "TaskAudioNormalizationDescription": "Skanas dosierojn por sonnivelaj normaligaj datumoj.",
    "TaskRefreshTrickplayImages": "Generi la bildojn por TrickPlay (Antaŭrigardo rapida antaŭen)",
    "TaskAudioNormalization": "Normaligo Sonnivela",
-    "HearingImpaired": "Surda"
+    "HearingImpaired": "Surda",
+    "NameExtraDeletedScene": "Forigita sceno",
+    "NameExtraScene": "Sceno",
+    "NameExtraThemeSong": "Tema Kanto",
+    "Original": "Originala"
 }
@@ -114,5 +114,12 @@
    "NameExtraScene": "Eszena",
    "NameExtraShort": "Laburra",
    "NameExtraThemeSong": "Gai-abestia",
-    "NameExtraThemeVideo": "Gai-bideoa"
+    "NameExtraThemeVideo": "Gai-bideoa",
+    "NameExtraBehindTheScenes": "Eszenen atzean",
+    "NameExtraClip": "Klipa",
+    "NameExtraDeletedScene": "Ezabatutako eszena",
+    "NameExtraFeaturette": "Erreportajea",
+    "NameExtraInterview": "Elkarrizketa",
+    "NameExtraTrailer": "Trailerra",
+    "NameExtraUnknown": "Extra"
 }
@@ -108,5 +108,17 @@
    "CleanupUserDataTask": "Käyttäjätietojen puhdistustehtävä",
    "CleanupUserDataTaskDescription": "Puhdistaa kaikki käyttäjätiedot (katselutila, suosikit ym.) medioista, joita ei ole ollut saatavilla yli 90 päivään.",
    "LyricDownloadFailureFromForItem": "Sanoitusten lataus kohteesta {0} kappaleelle {1} epäonnistui",
-    "Original": "Alkuperäinen"
+    "Original": "Alkuperäinen",
+    "NameExtraBehindTheScenes": "Kulissien Takana",
+    "NameExtraClip": "Klippi",
+    "NameExtraDeletedScene": "Poistettu Kohtaus",
+    "NameExtraFeaturette": "Lyhytelokuva",
+    "NameExtraInterview": "Haastattelu",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Näyte",
+    "NameExtraScene": "Kohtaus",
+    "NameExtraShort": "Lyhytfilmi",
+    "NameExtraThemeSong": "Tunnusmusiikki",
+    "NameExtraThemeVideo": "Tunnusvideo",
+    "NameExtraTrailer": "Traileri"
 }
@@ -1,19 +1,19 @@
 {
    "Artists": "Tónlistafólk",
-    "Collections": "Søvn",
+    "Collections": "Samlingar",
    "Default": "Forsett",
    "External": "Ytri",
    "Genres": "Greinar",
    "AppDeviceValues": "App: {0}, Eind: {1}",
    "Books": "Bøkur",
    "ChapterNameValue": "Kapittul {0}",
-    "Favorites": "Yndis",
-    "Folders": "Mappur",
+    "Favorites": "Yndislista",
+    "Folders": "Skjáttur",
    "Forced": "Kravt",
    "FailedLoginAttemptWithUserName": "Miseydnað innritanarroynd frá {0}",
    "HeaderFavoriteEpisodes": "Yndispartar",
    "LabelIpAddressValue": "IP-atsetur: {0}",
-    "AuthenticationSucceededWithUserName": "{0} varð samgildur",
+    "AuthenticationSucceededWithUserName": "{0} var samgildur",
    "HeaderFavoriteShows": "Yndisrøðir",
    "HeaderLiveTV": "Beinleiðis sjónvarp",
    "HearingImpaired": "Hoyrnarveik",
@@ -55,8 +55,8 @@
    "TaskUpdatePluginsDescription": "Niðurtekur og innleggur dagføringar til ískoytisforrit ið eru stillaði til at dagførast sjálvvirkandi.",
    "TaskCleanTranscodeDescription": "Strikar umkotaðar fílar ið eru eldri enn 1 dag.",
    "TaskOptimizeDatabase": "Albøt dátugrunn",
-    "NameSeasonNumber": "Sesong {0}",
-    "NameSeasonUnknown": "Ókend sesong",
+    "NameSeasonNumber": "Umfar {0}",
+    "NameSeasonUnknown": "Ókent umfar",
    "ScheduledTaskFailedWithName": "{0} miseydnaðist",
    "Undefined": "Óskilmarkað",
    "TasksMaintenanceCategory": "Viðlíkahald",
@@ -68,7 +68,7 @@
    "NotificationOptionServerRestartRequired": "Tørvur er á ambætaraendurbyrjan",
    "TasksApplicationCategory": "Nýtsluskipan",
    "NotificationOptionApplicationUpdateAvailable": "Skipanardagføring er tøk",
-    "NotificationOptionApplicationUpdateInstalled": "Skipanardagføring varð innløgd",
+    "NotificationOptionApplicationUpdateInstalled": "Skipanardagføring var innløgd",
    "UserStoppedPlayingItemWithValues": "{0} er liðugur at spæla {1} á {2}",
    "HomeVideos": "Heimaupptøkur",
    "StartupEmbyServerIsLoading": "Jellyfin-ambætarin er undir byrjanarinnlesing. Vinaliga royn aftur um eitt bil.",
@@ -104,12 +104,22 @@
    "NotificationOptionCameraImageUploaded": "Ljósmynd uppsend",
    "NameExtraShort": "Stuttfilmur",
    "NameExtraThemeSong": "Eyðkennislag",
-    "NameExtraTrailer": "Forfilmur",
+    "NameExtraTrailer": "Brellbiti",
    "NameExtraInterview": "Samrøða",
    "NameExtraBehindTheScenes": "Aftanfyri leiktjøldini",
    "NameExtraClip": "Klipp",
    "NameExtraNumbered": "{0} {1}",
    "NameExtraFeaturette": "Stuttur heimildarfilmur",
    "TaskAudioNormalization": "Ljóðjavnan",
-    "TaskAudioNormalizationDescription": "Kannar fílur fyri dátum til ljóðjavnan."
+    "TaskAudioNormalizationDescription": "Kannar fílur fyri dátum til ljóðjavnan.",
+    "NameExtraSample": "Sýnislutur",
+    "TaskRefreshTrickplayImages": "Framleið Trickplay-myndir",
+    "TaskRefreshTrickplayImagesDescription": "Framleiðir trickplay-myndir fyri kykmyndir í søvnunm har tað er virkt.",
+    "TaskMoveTrickplayImages": "Flyt Trickplay-myndagoymslustað",
+    "TaskMoveTrickplayImagesDescription": "Flytur verandi trickplay-fílur sambært savnsstillingunum.",
+    "NameExtraThemeVideo": "Eyðkenniskykmynd",
+    "NameExtraDeletedScene": "Úrtikin mynd",
+    "NameExtraScene": "Mynd",
+    "NameExtraUnknown": "Eykatilfar",
+    "Original": "Upprunalig(t/ur)"
 }
@@ -108,5 +108,17 @@
    "CleanupUserDataTask": "Tasc glantacháin sonraí úsáideora",
    "CleanupUserDataTaskDescription": "Glanann sé gach sonraí úsáideora (stádas faire, stádas is fearr leat srl.) ó mheáin nach bhfuil i láthair a thuilleadh ar feadh 90 lá ar a laghad.",
    "Original": "Bunaidh",
-    "LyricDownloadFailureFromForItem": "Theip ar liricí a íoslódáil ó {0} do {1}"
+    "LyricDownloadFailureFromForItem": "Theip ar liricí a íoslódáil ó {0} do {1}",
+    "NameExtraBehindTheScenes": "Taobh thiar de na Radhairc",
+    "NameExtraClip": "Gearrthóg",
+    "NameExtraDeletedScene": "Radharc Scriosta",
+    "NameExtraFeaturette": "Mionghné",
+    "NameExtraInterview": "Agallamh",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Sampla",
+    "NameExtraScene": "Radharc",
+    "NameExtraShort": "Gearr",
+    "NameExtraThemeSong": "Amhrán Téama",
+    "NameExtraThemeVideo": "Físeán Téama",
+    "NameExtraTrailer": "Leantóir"
 }
@@ -107,5 +107,19 @@
    "TaskAudioNormalizationDescription": "Escanea ficheiros á procura de datos de normalización de volume.",
    "CleanupUserDataTask": "Tarefa de limpeza de datos dos usuarios",
    "CleanupUserDataTaskDescription": "Limpa todos os datos do usuario (estado de visualización, de favorito etc.) dos medios ausentes polo menos 90 días.",
-    "Original": "Orixinal"
+    "Original": "Orixinal",
+    "LyricDownloadFailureFromForItem": "Non se puideron descargar as letras desde {0} para {1}",
+    "NameExtraBehindTheScenes": "Detrás das Cámaras",
+    "NameExtraClip": "Clip",
+    "NameExtraDeletedScene": "Escena Eliminada",
+    "NameExtraFeaturette": "Reportaxe especial",
+    "NameExtraInterview": "Entrevista",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Mostra",
+    "NameExtraScene": "Escena",
+    "NameExtraShort": "Curtametraxe",
+    "NameExtraThemeSong": "Canción principal",
+    "NameExtraThemeVideo": "Vídeo da canción principal",
+    "NameExtraTrailer": "Tráiler",
+    "NameExtraUnknown": "Extra"
 }
@@ -108,5 +108,12 @@
    "CleanupUserDataTaskDescription": "ניקוי כל המידע של המשתמש (מצב צפייה, מועדפים וכו) ממדיה שאינה קיימת מעל 90 יום.",
    "CleanupUserDataTask": "משימת ניקוי מידע משתמש",
    "LyricDownloadFailureFromForItem": "הורדת המילים מ-{0} עבור {1} נכשלה",
-    "Original": "מקור"
+    "Original": "מקור",
+    "NameExtraBehindTheScenes": "מאחורי הקלעים",
+    "NameExtraClip": "קליפ",
+    "NameExtraDeletedScene": "סצנה שנמחקה",
+    "NameExtraFeaturette": "סרט קצר",
+    "NameExtraInterview": "ריאיון",
+    "NameExtraSample": "דגימה",
+    "NameExtraScene": "סצנה"
 }
@@ -106,5 +106,20 @@
    "TaskMoveTrickplayImages": "ट्रिकप्ले छवि स्थान माइग्रेट करें",
    "TaskMoveTrickplayImagesDescription": "लाइब्रेरी सेटिंग्स के अनुसार मौजूदा ट्रिकप्ले फ़ाइलों को स्थानांतरित करता है।",
    "CleanupUserDataTask": "यूज़र डेटा सफाई कार्य",
-    "Original": "असली"
+    "Original": "असली",
+    "LyricDownloadFailureFromForItem": "{0} के लिए {1} से बोल (Lyrics) डाउनलोड करने में विफल रहा",
+    "NameExtraBehindTheScenes": "परदे के पीछे",
+    "NameExtraClip": "क्लिप",
+    "NameExtraDeletedScene": "हटाया गया दृश्य",
+    "NameExtraFeaturette": "फीचरेट",
+    "NameExtraInterview": "साक्षात्कार",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "नमूना",
+    "NameExtraScene": "दृश्य",
+    "NameExtraShort": "शॉर्ट",
+    "NameExtraThemeSong": "थीम सॉन्ग",
+    "NameExtraThemeVideo": "थीम वीडियो",
+    "NameExtraTrailer": "ट्रेलर",
+    "NameExtraUnknown": "अतिरिक्त",
+    "CleanupUserDataTaskDescription": "कम से कम 90 दिनों से अनुपस्थित मीडिया से सभी उपयोगकर्ता डेटा (देखने की स्थिति, पसंदीदा स्थिति आदि) को साफ़ करता है।"
 }
@@ -108,5 +108,17 @@
    "CleanupUserDataTask": "Zadatak čišćenja korisničkih podataka",
    "CleanupUserDataTaskDescription": "Briše sve korisničke podatke (stanje gledanja, status favorita itd.) s medija koji više nisu prisutni najmanje 90 dana.",
    "Original": "Original",
-    "LyricDownloadFailureFromForItem": "Preuzimanje tekstova pjesmi od {0} za {1} nije uspjelo"
+    "LyricDownloadFailureFromForItem": "Preuzimanje tekstova pjesmi od {0} za {1} nije uspjelo",
+    "NameExtraBehindTheScenes": "Iza kulisa",
+    "NameExtraClip": "Klip",
+    "NameExtraDeletedScene": "Obrisana Scena",
+    "NameExtraFeaturette": "Promotivni video",
+    "NameExtraInterview": "Intervju",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Uzorak",
+    "NameExtraScene": "Scena",
+    "NameExtraShort": "Kratki film",
+    "NameExtraThemeSong": "Glavna Pjesma",
+    "NameExtraThemeVideo": "Tema videa",
+    "NameExtraTrailer": "Trailer"
 }
@@ -120,5 +120,6 @@
    "NameExtraThemeSong": "Főcímdal",
    "NameExtraThemeVideo": "Főcímvideó",
    "NameExtraTrailer": "Előzetes",
-    "NameExtraUnknown": "Extra"
+    "NameExtraUnknown": "Extra",
+    "NameExtraNumbered": "{0} {1}"
 }
@@ -24,5 +24,10 @@
    "TaskDownloadMissingSubtitles": "Ներբեռնել պակասող ենթագրերը",
    "AppDeviceValues": "Հավելված` {0}, Սարք `{1}",
    "ChapterNameValue": "Գլուխ {0}",
-    "Collections": "Հավաքածուներ"
+    "Collections": "Հավաքածուներ",
+    "Artists": "Երաժիշտներ",
+    "Default": "Լռելյայն",
+    "Favorites": "Ընտրյալ",
+    "Forced": "Ստիպուած",
+    "Genres": "Ոճ"
 }
@@ -118,5 +118,8 @@
    "NameExtraSample": "Campione",
    "NameExtraShort": "Corto",
    "NameExtraThemeSong": "Sigla musicale",
-    "NameExtraTrailer": "Trailer"
+    "NameExtraTrailer": "Trailer",
+    "NameExtraFeaturette": "Caratteristica",
+    "NameExtraThemeVideo": "Video tematico",
+    "NameExtraUnknown": "Extra"
 }
@@ -108,5 +108,17 @@
    "LyricDownloadFailureFromForItem": "Feeler beim Download vun de Songtexter vun {0} fir {1}",
    "Original": "Original",
    "CleanupUserDataTask": "Aufgab fir Berengege vu Benotzerdaten",
-    "CleanupUserDataTaskDescription": "Läscht all Benotzerdaten (Ofspillstatus, Favoritestatus, asw.) vu Medien, déi zënter mindestens 90 Deeg net méi besteeënd sinn."
+    "CleanupUserDataTaskDescription": "Läscht all Benotzerdaten (Ofspillstatus, Favoritestatus, asw.) vu Medien, déi zënter mindestens 90 Deeg net méi besteeënd sinn.",
+    "NameExtraBehindTheScenes": "Hannert de Kulissen",
+    "NameExtraClip": "Clip",
+    "NameExtraDeletedScene": "Geläschte Scène",
+    "NameExtraFeaturette": "Featurette",
+    "NameExtraInterview": "Interview",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Beispill",
+    "NameExtraScene": "Scène",
+    "NameExtraShort": "Kuerzfilm",
+    "NameExtraThemeSong": "Theme-Lidd",
+    "NameExtraThemeVideo": "Theme-Video",
+    "NameExtraTrailer": "Bande-Annonce"
 }
@@ -59,8 +59,8 @@
    "UserOfflineFromDevice": "{0} buvo atjungtas nuo {1}",
    "UserOnlineFromDevice": "{0} prisijungęs iš {1}",
    "UserPasswordChangedWithName": "Slaptažodis pakeistas naudotojui {0}",
-    "UserStartedPlayingItemWithValues": "{0} leidžia {1} į {2}",
-    "UserStoppedPlayingItemWithValues": "{0} baigė leisti {1} į {2}",
+    "UserStartedPlayingItemWithValues": "{0} atkuriama {1} į {2}",
+    "UserStoppedPlayingItemWithValues": "{0} baigė atkūrimą {1} į {2}",
    "VersionNumber": "Versija {0}",
    "TaskUpdatePluginsDescription": "Atsisiunčia ir įdiegia įskiepių, kurie sukonfigūruoti atnaujinti automatiškai, naujinius.",
    "TaskUpdatePlugins": "Atnaujinti įskieius",
@@ -87,7 +87,7 @@
    "TaskCleanActivityLog": "Išvalyti veiklos žurnalą",
    "Undefined": "Neapibrėžtas",
    "Forced": "Priverstinis",
-    "Default": "Numatytas",
+    "Default": "Numatytasis",
    "TaskCleanActivityLogDescription": "Ištrina senesnius nei nustatytas amžius veiklos žurnalo įrašus.",
    "TaskOptimizeDatabase": "Optimizuoti duomenų bazę",
    "TaskKeyframeExtractorDescription": "Iš vaizdo įrašo paruošia reikšminius kadrus, kad būtų sukuriamas tikslenis HLS grojaraštis. Šios užduoties vykdymas gali ilgai užtrukti.",
@@ -100,14 +100,14 @@
    "TaskAudioNormalization": "Garso normalizavimas",
    "TaskAudioNormalizationDescription": "Skenuoja failus, ieškant garso normalizavimo duomenų.",
    "TaskExtractMediaSegments": "Medijos segmentų nuskaitymas",
-    "TaskDownloadMissingLyrics": "Parsisiųsti trūkstamus dainų tekstus",
+    "TaskDownloadMissingLyrics": "Atsisiųsti trūkstamus dainų tekstus",
    "TaskExtractMediaSegmentsDescription": "Ištraukia arba gauna medijos segmentus iš MediaSegment ijungtų įskiepių.",
    "TaskMoveTrickplayImages": "Pakeisti Trickplay atvaizdų vietą",
    "TaskMoveTrickplayImagesDescription": "Perkelia egzistuojančius Trickplay failus pagal bibliotekos nustatymus.",
-    "TaskDownloadMissingLyricsDescription": "Parsisiųsti dainų žodžius",
+    "TaskDownloadMissingLyricsDescription": "Atsisiųsti dainų tekstus",
    "CleanupUserDataTask": "Naudotojo duomenų valymo užduotis",
    "CleanupUserDataTaskDescription": "Iš medijos, kurios nebėra bent 90 dienų, išvalo visus naudotojo duomenis (žiūrėjimo būseną, mėgstamą būseną ir t. t.).",
-    "LyricDownloadFailureFromForItem": "Nepavyko atsisiųsti dainos žodžių iš {0}, skirto {1}",
+    "LyricDownloadFailureFromForItem": "Nepavyko atsisiųsti dainos teksto iš {0}, skirto {1}",
    "NameExtraBehindTheScenes": "Užkulisiuose",
    "NameExtraClip": "Klipas",
    "NameExtraDeletedScene": "Ištrinta scena",
@@ -108,5 +108,17 @@
    "CleanupUserDataTask": "Lietotāju datu tīrīšanas uzdevums",
    "CleanupUserDataTaskDescription": "Notīra visus lietotāja datus (skatīšanās stāvokļus, favorītu statusi utt.) no medijiem, kas vairs nav pieejami vismaz 90 dienas.",
    "Original": "Oriģināls",
-    "LyricDownloadFailureFromForItem": "Dziesmu vārdi nevarēja tikt lejupielādēti no {0} priekš {1}"
+    "LyricDownloadFailureFromForItem": "Dziesmu vārdi nevarēja tikt lejupielādēti no {0} priekš {1}",
+    "NameExtraBehindTheScenes": "Aiz kadra",
+    "NameExtraClip": "Klips",
+    "NameExtraDeletedScene": "Izdzēsta aina",
+    "NameExtraFeaturette": "Īsfilma",
+    "NameExtraInterview": "Intervija",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Paraugs",
+    "NameExtraScene": "Aina",
+    "NameExtraShort": "Īsfilma",
+    "NameExtraThemeSong": "Motīvu dziesma",
+    "NameExtraThemeVideo": "Tēmas video",
+    "NameExtraTrailer": "Treileris"
 }
@@ -106,5 +106,11 @@
    "TaskAudioNormalization": "Normalisasi Audio",
    "TaskAudioNormalizationDescription": "Mengimbas fail-fail untuk data normalisasi audio.",
    "CleanupUserDataTaskDescription": "Membersihkan semua data pengguna (keadaan tontonan, status kegemaran, dan sebagainya) daripada media yang tidak lagi wujud sekurang-kurangnya selama 90 hari.",
-    "CleanupUserDataTask": "Tugas pembersihan data pengguna"
+    "CleanupUserDataTask": "Tugas pembersihan data pengguna",
+    "LyricDownloadFailureFromForItem": "Lirik gagal dimuat turun dari {0} untuk {1}",
+    "NameExtraBehindTheScenes": "Di Sebalik Takbir",
+    "NameExtraClip": "Klip",
+    "NameExtraInterview": "Temu bual",
+    "NameExtraThemeSong": "Lagu Tema",
+    "NameExtraThemeVideo": "Video Tema"
 }
@@ -106,5 +106,15 @@
    "TaskMoveTrickplayImagesDescription": "Flytter eksisterende Trickplay-filer i henhold til biblioteksinstillingene.",
    "TaskExtractMediaSegmentsDescription": "Trekker ut eller henter mediasegmenter fra plugins som støtter MediaSegment.",
    "CleanupUserDataTaskDescription": "Sletter all brukerdata (avspillings-status, favoritter osv.) fra innhold som har vært utilgjengelig i minst 90 dager.",
-    "CleanupUserDataTask": "Oppgave for opprydding av brukerdata"
+    "CleanupUserDataTask": "Oppgave for opprydding av brukerdata",
+    "NameExtraBehindTheScenes": "Bak kulissene",
+    "NameExtraDeletedScene": "Slettet scene",
+    "NameExtraFeaturette": "Presentasjonsfilm",
+    "NameExtraInterview": "Intervju",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Prøve",
+    "NameExtraScene": "Scene",
+    "NameExtraThemeSong": "Tema-låt",
+    "NameExtraThemeVideo": "Tema-video",
+    "NameExtraTrailer": "Trailer"
 }
@@ -120,5 +120,6 @@
    "NameExtraThemeVideo": "Vídeo de Abertura",
    "NameExtraTrailer": "Trailer",
    "NameExtraUnknown": "Extra",
-    "NameExtraFeaturette": "Nos Bastidores"
+    "NameExtraFeaturette": "Nos Bastidores",
+    "NameExtraInterview": "Entrevista"
 }
@@ -5,108 +5,121 @@
    "Books": "Livros",
    "ChapterNameValue": "Capítulo {0}",
    "Collections": "Coleções",
-    "FailedLoginAttemptWithUserName": "Tentativa de login falhada a partir de {0}",
+    "FailedLoginAttemptWithUserName": "Tentativa falhada de início de sessão do utilizador {0}",
    "Favorites": "Favoritos",
    "Folders": "Pastas",
    "Genres": "Géneros",
    "HeaderContinueWatching": "Continuar a ver",
-    "HeaderFavoriteEpisodes": "Episódios Favoritos",
-    "HeaderFavoriteShows": "Séries Favoritas",
-    "HeaderLiveTV": "TV em Direto",
-    "HeaderNextUp": "A Seguir",
-    "HomeVideos": "Vídeos Caseiros",
+    "HeaderFavoriteEpisodes": "Episódios favoritos",
+    "HeaderFavoriteShows": "Séries favoritas",
+    "HeaderLiveTV": "TV em direto",
+    "HeaderNextUp": "A seguir",
+    "HomeVideos": "Vídeos caseiros",
    "Inherit": "Herdar",
    "LabelIpAddressValue": "Endereço IP: {0}",
    "LabelRunningTimeValue": "Duração: {0}",
-    "Latest": "Mais Recente",
-    "MixedContent": "Conteúdo Misto",
+    "Latest": "Mais recente",
+    "MixedContent": "Conteúdo misto",
    "Movies": "Filmes",
    "Music": "Música",
    "MusicVideos": "Videoclipes",
-    "NameInstallFailed": "{0} falha na instalação",
+    "NameInstallFailed": "Falha na instalação de {0}",
    "NameSeasonNumber": "Temporada {0}",
-    "NameSeasonUnknown": "Temporada Desconhecida",
+    "NameSeasonUnknown": "Temporada desconhecida",
    "NewVersionIsAvailable": "Está disponível para transferência uma nova versão do servidor Jellyfin.",
    "NotificationOptionApplicationUpdateAvailable": "Atualização de aplicação disponível",
    "NotificationOptionApplicationUpdateInstalled": "Atualização de aplicação instalada",
-    "NotificationOptionAudioPlayback": "Reprodução Iniciada",
-    "NotificationOptionAudioPlaybackStopped": "Reprodução Parada",
+    "NotificationOptionAudioPlayback": "Reprodução de áudio iniciada",
+    "NotificationOptionAudioPlaybackStopped": "Reprodução de áudio interrompida",
    "NotificationOptionCameraImageUploaded": "Imagem da câmara enviada",
    "NotificationOptionInstallationFailed": "Falha na instalação",
    "NotificationOptionNewLibraryContent": "Novo conteúdo adicionado",
-    "NotificationOptionPluginError": "Falha na extensão",
-    "NotificationOptionPluginInstalled": "Extensão instalada",
-    "NotificationOptionPluginUninstalled": "Extensão desinstalada",
-    "NotificationOptionPluginUpdateInstalled": "Extensão atualizada",
+    "NotificationOptionPluginError": "Falha no plugin",
+    "NotificationOptionPluginInstalled": "Plugin instalado",
+    "NotificationOptionPluginUninstalled": "Plugin desinstalado",
+    "NotificationOptionPluginUpdateInstalled": "Atualização de plugin instalada",
    "NotificationOptionServerRestartRequired": "Necessário reiniciar o servidor",
    "NotificationOptionTaskFailed": "Falha em tarefa agendada",
    "NotificationOptionUserLockedOut": "Utilizador bloqueado",
-    "NotificationOptionVideoPlayback": "Reprodução do vídeo iniciada",
-    "NotificationOptionVideoPlaybackStopped": "Reprodução do vídeo parada",
+    "NotificationOptionVideoPlayback": "Reprodução de vídeo iniciada",
+    "NotificationOptionVideoPlaybackStopped": "Reprodução de vídeo interrompida",
    "Photos": "Fotografias",
    "PluginInstalledWithName": "{0} foi instalado",
    "PluginUninstalledWithName": "{0} foi desinstalado",
    "PluginUpdatedWithName": "{0} foi atualizado",
    "ScheduledTaskFailedWithName": "{0} falhou",
    "Shows": "Séries",
-    "StartupEmbyServerIsLoading": "O servidor Jellyfin está a iniciar. Tente novamente mais tarde.",
-    "SubtitleDownloadFailureFromForItem": "Falha na transferência de legendas a partir de {0} para {1}",
-    "TvShows": "Séries",
+    "StartupEmbyServerIsLoading": "O servidor Jellyfin está a iniciar. Tenta novamente dentro de instantes.",
+    "SubtitleDownloadFailureFromForItem": "Falha ao transferir legendas de {0} para {1}",
+    "TvShows": "Séries de TV",
    "UserCreatedWithName": "Utilizador {0} criado",
-    "UserDeletedWithName": "Utilizador {0} apagado",
+    "UserDeletedWithName": "Utilizador {0} eliminado",
    "UserDownloadingItemWithValues": "{0} está a transferir {1}",
    "UserLockedOutWithName": "Utilizador {0} bloqueado",
-    "UserOfflineFromDevice": "{0} desligou-se a partir de {1}",
-    "UserOnlineFromDevice": "{0} ligou-se a partir de {1}",
+    "UserOfflineFromDevice": "{0} desligou-se de {1}",
+    "UserOnlineFromDevice": "{0} está online em {1}",
    "UserPasswordChangedWithName": "Palavra-passe alterada para o utilizador {0}",
    "UserStartedPlayingItemWithValues": "{0} está a reproduzir {1} em {2}",
    "UserStoppedPlayingItemWithValues": "{0} terminou a reprodução de {1} em {2}",
    "VersionNumber": "Versão {0}",
-    "TaskDownloadMissingSubtitlesDescription": "Procurar na internet por legendas em falta baseado na configuração de metadados.",
+    "TaskDownloadMissingSubtitlesDescription": "Procura na Internet legendas em falta com base na configuração dos metadados.",
    "TaskDownloadMissingSubtitles": "Transferir legendas em falta",
-    "TaskRefreshChannelsDescription": "Atualizar informação sobre canais da Internet.",
-    "TaskRefreshChannels": "Atualizar Canais",
-    "TaskCleanTranscodeDescription": "Apagar ficheiros de transcode com mais de um dia.",
-    "TaskCleanTranscode": "Limpar a Diretoria de Transcode",
-    "TaskUpdatePluginsDescription": "Faz o download e instala updates para os plugins que estão configurados para atualizar automaticamente.",
-    "TaskUpdatePlugins": "Atualizar Plugins",
-    "TaskRefreshPeopleDescription": "Atualizar metadados para elenco e equipa técnica da tua mediateca.",
-    "TaskRefreshPeople": "Atualizar Pessoas",
-    "TaskCleanLogsDescription": "Apagar ficheiros de log que têm mais de {0} dias.",
-    "TaskCleanLogs": "Limpar a Diretoria de Logs",
-    "TaskRefreshLibraryDescription": "Analisar a mediateca para novos ficheiros e atualizar os metadados.",
-    "TaskRefreshLibrary": "Analisar mediateca",
-    "TaskRefreshChapterImagesDescription": "Criar thumbnails para os vídeos que têm capítulos.",
-    "TaskRefreshChapterImages": "Extrair Imagens dos Capítulos",
-    "TaskCleanCacheDescription": "Apagar ficheiros em cache que já não são necessários.",
-    "TaskCleanCache": "Limpar Cache",
+    "TaskRefreshChannelsDescription": "Atualiza as informações dos canais da Internet.",
+    "TaskRefreshChannels": "Atualizar canais",
+    "TaskCleanTranscodeDescription": "Elimina ficheiros de transcodificação com mais de um dia.",
+    "TaskCleanTranscode": "Limpar pasta de transcodificação",
+    "TaskUpdatePluginsDescription": "Transfere e instala atualizações dos plugins configurados para atualização automática.",
+    "TaskUpdatePlugins": "Atualizar plugins",
+    "TaskRefreshPeopleDescription": "Atualiza os metadados de atores e realizadores na tua biblioteca multimédia.",
+    "TaskRefreshPeople": "Atualizar pessoas",
+    "TaskCleanLogsDescription": "Elimina ficheiros de registo com mais de {0} dias.",
+    "TaskCleanLogs": "Limpar pasta de registos",
+    "TaskRefreshLibraryDescription": "Analisa a biblioteca multimédia à procura de novos ficheiros e atualiza os metadados.",
+    "TaskRefreshLibrary": "Analisar biblioteca multimédia",
+    "TaskRefreshChapterImagesDescription": "Cria miniaturas para vídeos que têm capítulos.",
+    "TaskRefreshChapterImages": "Extrair imagens dos capítulos",
+    "TaskCleanCacheDescription": "Elimina ficheiros de cache que já não são necessários ao sistema.",
+    "TaskCleanCache": "Limpar pasta de cache",
    "TasksChannelsCategory": "Canais da Internet",
    "TasksApplicationCategory": "Aplicação",
-    "TasksLibraryCategory": "Mediateca",
+    "TasksLibraryCategory": "Biblioteca",
    "TasksMaintenanceCategory": "Manutenção",
-    "TaskCleanActivityLogDescription": "Apaga as entradas do registo de atividade anteriores à data configurada.",
+    "TaskCleanActivityLogDescription": "Elimina as entradas do registo de atividade mais antigas do que o período configurado.",
    "TaskCleanActivityLog": "Limpar registo de atividade",
    "Undefined": "Indefinido",
    "Forced": "Forçado",
    "Default": "Predefinição",
-    "TaskOptimizeDatabaseDescription": "Otimiza e liberta espaço livre na base de dados. A execução desta tarefa depois de analisar a mediateca ou efetuar outras alterações que impliquem modificações na base de dados pode melhorar o desempenho.",
+    "TaskOptimizeDatabaseDescription": "Compacta a base de dados e liberta espaço não utilizado. A execução desta tarefa depois de analisar a biblioteca ou de outras alterações que modifiquem a base de dados pode melhorar o desempenho.",
    "TaskOptimizeDatabase": "Otimizar base de dados",
-    "TaskKeyframeExtractorDescription": "Extrai quadros-chave de ficheiros de video para criar listas de reprodução HLS mais precisas. Esta tarefa pode demorar algum tempo.",
-    "TaskKeyframeExtractor": "Extrator de Quadros-chave",
+    "TaskKeyframeExtractorDescription": "Extrai fotogramas-chave de ficheiros de vídeo para criar playlists HLS mais precisas. Esta tarefa pode demorar algum tempo.",
+    "TaskKeyframeExtractor": "Extrator de fotogramas-chave",
    "External": "Externo",
-    "HearingImpaired": "Surdo",
+    "HearingImpaired": "Deficiência auditiva",
    "TaskRefreshTrickplayImages": "Gerar imagens de trickplay",
    "TaskRefreshTrickplayImagesDescription": "Cria pré-visualizações de trickplay para vídeos nas bibliotecas ativadas.",
    "TaskAudioNormalizationDescription": "Analisa os ficheiros para obter dados de normalização de áudio.",
    "TaskAudioNormalization": "Normalização de áudio",
-    "TaskExtractMediaSegments": "Analisar segmentos de multimédia",
-    "TaskDownloadMissingLyrics": "Transferir letra em falta",
-    "TaskMoveTrickplayImages": "Migrar a localização da imagem do Trickplay",
-    "TaskDownloadMissingLyricsDescription": "Transferir letra para músicas",
-    "TaskExtractMediaSegmentsDescription": "Extrai ou obtém segmentos de multimédia a partir de plugins com suporte para MediaSegment.",
-    "TaskMoveTrickplayImagesDescription": "Move os ficheiros trickplay existentes de acordo com as definições da mediateca.",
-    "CleanupUserDataTaskDescription": "Apaga todos os dados de utilizador (estados de reprodução, favoritos, etc) de arquivos média não presentes há 90 dias ou mais.",
+    "TaskExtractMediaSegments": "Analisar segmentos multimédia",
+    "TaskDownloadMissingLyrics": "Transferir letras em falta",
+    "TaskMoveTrickplayImages": "Migrar localização das imagens de trickplay",
+    "TaskDownloadMissingLyricsDescription": "Transfere letras de músicas",
+    "TaskExtractMediaSegmentsDescription": "Extrai ou obtém segmentos multimédia de plugins com MediaSegment ativado.",
+    "TaskMoveTrickplayImagesDescription": "Move os ficheiros de trickplay existentes de acordo com as definições da biblioteca.",
+    "CleanupUserDataTaskDescription": "Remove todos os dados de utilizador (estado de reprodução, estado de favorito, etc.) de conteúdos multimédia que já não estejam presentes há pelo menos 90 dias.",
    "CleanupUserDataTask": "Limpeza de dados de utilizador",
    "Original": "Original",
-    "LyricDownloadFailureFromForItem": "Erro ao descarregar letras de {0} para {1}"
+    "LyricDownloadFailureFromForItem": "Falha ao transferir letras de {0} para {1}",
+    "NameExtraDeletedScene": "Cena eliminada",
+    "NameExtraInterview": "Entrevista",
+    "NameExtraUnknown": "Extra",
+    "NameExtraBehindTheScenes": "Bastidores",
+    "NameExtraSample": "Amostra",
+    "NameExtraScene": "Cena",
+    "NameExtraClip": "Excerto",
+    "NameExtraFeaturette": "Minidocumentário",
+    "NameExtraThemeSong": "Tema musical",
+    "NameExtraThemeVideo": "Vídeo temático",
+    "NameExtraShort": "Curta-metragem",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraTrailer": "Trailer"
 }
@@ -1,124 +1,125 @@
 {
-    "HeaderLiveTV": "TV Em Direto",
+    "HeaderLiveTV": "TV em direto",
    "Collections": "Coleções",
    "Books": "Livros",
    "Artists": "Artistas",
-    "HeaderNextUp": "A Seguir",
-    "HeaderFavoriteEpisodes": "Episódios Favoritos",
-    "HeaderFavoriteShows": "Séries Favoritas",
+    "HeaderNextUp": "A seguir",
+    "HeaderFavoriteEpisodes": "Episódios favoritos",
+    "HeaderFavoriteShows": "Séries favoritas",
    "HeaderContinueWatching": "Continuar a ver",
    "Genres": "Géneros",
    "Folders": "Pastas",
    "Favorites": "Favoritos",
-    "UserDownloadingItemWithValues": "{0} está sendo baixado {1}",
+    "UserDownloadingItemWithValues": "{0} está a transferir {1}",
    "VersionNumber": "Versão {0}",
    "UserStoppedPlayingItemWithValues": "{0} terminou a reprodução de {1} em {2}",
-    "UserStartedPlayingItemWithValues": "{0} está reproduzindo {1} em {2}",
-    "UserPasswordChangedWithName": "A senha do usuário {0} foi alterada",
-    "UserOnlineFromDevice": "{0} está online a partir de {1}",
-    "UserOfflineFromDevice": "{0} desconectou-se a partir de {1}",
-    "UserLockedOutWithName": "O usuário {0} foi bloqueado",
-    "UserDeletedWithName": "O usuário {0} foi removido",
-    "UserCreatedWithName": "O usuário {0} foi criado",
-    "TvShows": "Séries",
-    "SubtitleDownloadFailureFromForItem": "Falha na transferência de legendas de {0} para {1}",
-    "StartupEmbyServerIsLoading": "O servidor Jellyfin está iniciando. Tente novamente dentro de momentos.",
+    "UserStartedPlayingItemWithValues": "{0} está a reproduzir {1} em {2}",
+    "UserPasswordChangedWithName": "Palavra-passe alterada para o utilizador {0}",
+    "UserOnlineFromDevice": "{0} está online em {1}",
+    "UserOfflineFromDevice": "{0} desligou-se de {1}",
+    "UserLockedOutWithName": "Utilizador {0} bloqueado",
+    "UserDeletedWithName": "Utilizador {0} eliminado",
+    "UserCreatedWithName": "Utilizador {0} criado",
+    "TvShows": "Séries de TV",
+    "SubtitleDownloadFailureFromForItem": "Falha ao transferir legendas de {0} para {1}",
+    "StartupEmbyServerIsLoading": "O servidor Jellyfin está a iniciar. Tenta novamente dentro de instantes.",
    "ScheduledTaskFailedWithName": "{0} falhou",
    "PluginUpdatedWithName": "{0} foi atualizado",
    "PluginUninstalledWithName": "{0} foi desinstalado",
    "PluginInstalledWithName": "{0} foi instalado",
-    "NotificationOptionVideoPlaybackStopped": "Reprodução de vídeo parada",
+    "NotificationOptionVideoPlaybackStopped": "Reprodução de vídeo interrompida",
    "NotificationOptionVideoPlayback": "Reprodução de vídeo iniciada",
-    "NotificationOptionUserLockedOut": "Usuário bloqueado",
-    "NotificationOptionTaskFailed": "Falha na tarefa agendada",
-    "NotificationOptionServerRestartRequired": "É necessário reiniciar o servidor",
-    "NotificationOptionPluginUpdateInstalled": "Plugin atualizado",
+    "NotificationOptionUserLockedOut": "Utilizador bloqueado",
+    "NotificationOptionTaskFailed": "Falha em tarefa agendada",
+    "NotificationOptionServerRestartRequired": "Necessário reiniciar o servidor",
+    "NotificationOptionPluginUpdateInstalled": "Atualização de plugin instalada",
    "NotificationOptionPluginUninstalled": "Plugin desinstalado",
    "NotificationOptionPluginInstalled": "Plugin instalado",
    "NotificationOptionPluginError": "Falha no plugin",
    "NotificationOptionNewLibraryContent": "Novo conteúdo adicionado",
-    "NotificationOptionInstallationFailed": "Falha de instalação",
-    "NotificationOptionCameraImageUploaded": "Imagem de câmera enviada",
-    "NotificationOptionAudioPlaybackStopped": "Reprodução Parada",
-    "NotificationOptionAudioPlayback": "Reprodução Iniciada",
-    "NotificationOptionApplicationUpdateInstalled": "A atualização do aplicativo foi instalada",
-    "NotificationOptionApplicationUpdateAvailable": "Uma atualização do aplicativo está disponível",
-    "NewVersionIsAvailable": "Uma nova versão do servidor Jellyfin está disponível para download.",
-    "NameSeasonUnknown": "Temporada Desconhecida",
+    "NotificationOptionInstallationFailed": "Falha na instalação",
+    "NotificationOptionCameraImageUploaded": "Imagem da câmara enviada",
+    "NotificationOptionAudioPlaybackStopped": "Reprodução de áudio interrompida",
+    "NotificationOptionAudioPlayback": "Reprodução de áudio iniciada",
+    "NotificationOptionApplicationUpdateInstalled": "Atualização de aplicação instalada",
+    "NotificationOptionApplicationUpdateAvailable": "Atualização de aplicação disponível",
+    "NewVersionIsAvailable": "Está disponível para transferência uma nova versão do servidor Jellyfin.",
+    "NameSeasonUnknown": "Temporada desconhecida",
    "NameSeasonNumber": "Temporada {0}",
    "NameInstallFailed": "Falha na instalação de {0}",
    "MusicVideos": "Videoclipes",
    "Music": "Música",
-    "MixedContent": "Conteúdo diverso",
-    "Latest": "Mais Recente",
+    "MixedContent": "Conteúdo misto",
+    "Latest": "Mais recente",
    "LabelRunningTimeValue": "Duração: {0}",
-    "LabelIpAddressValue": "Endereço de IP: {0}",
+    "LabelIpAddressValue": "Endereço IP: {0}",
    "Inherit": "Herdar",
-    "HomeVideos": "Vídeos Caseiros",
+    "HomeVideos": "Vídeos caseiros",
    "Shows": "Séries",
    "Photos": "Fotografias",
    "Movies": "Filmes",
-    "FailedLoginAttemptWithUserName": "Tentativa de início de sessão falhada a partir de {0}",
+    "FailedLoginAttemptWithUserName": "Tentativa falhada de início de sessão do utilizador {0}",
    "ChapterNameValue": "Capítulo {0}",
    "AuthenticationSucceededWithUserName": "{0} autenticado com sucesso",
    "AppDeviceValues": "Aplicação: {0}, Dispositivo: {1}",
-    "TaskCleanCache": "Limpar Diretório de Cache",
+    "TaskCleanCache": "Limpar pasta de cache",
    "TasksApplicationCategory": "Aplicação",
-    "TasksLibraryCategory": "Mediateca",
+    "TasksLibraryCategory": "Biblioteca",
    "TasksMaintenanceCategory": "Manutenção",
-    "TaskRefreshChannels": "Atualizar Canais",
-    "TaskUpdatePlugins": "Atualizar Plugins",
-    "TaskCleanLogsDescription": "Deletar arquivos de log que existe a mais de {0} dias.",
-    "TaskCleanLogs": "Limpar diretório de logs",
-    "TaskRefreshLibrary": "Analisar mediateca",
+    "TaskRefreshChannels": "Atualizar canais",
+    "TaskUpdatePlugins": "Atualizar plugins",
+    "TaskCleanLogsDescription": "Elimina ficheiros de registo com mais de {0} dias.",
+    "TaskCleanLogs": "Limpar pasta de registos",
+    "TaskRefreshLibrary": "Analisar biblioteca multimédia",
    "TaskRefreshChapterImagesDescription": "Cria miniaturas para vídeos que têm capítulos.",
-    "TaskCleanCacheDescription": "Apaga ficheiros em cache que já não são usados pelo sistema.",
-    "TasksChannelsCategory": "Canais de Internet",
-    "TaskRefreshChapterImages": "Extrair Imagens do Capítulo",
-    "TaskDownloadMissingSubtitlesDescription": "Pesquisa na Internet as legendas em falta com base na configuração de metadados.",
+    "TaskCleanCacheDescription": "Elimina ficheiros de cache que já não são necessários ao sistema.",
+    "TasksChannelsCategory": "Canais da Internet",
+    "TaskRefreshChapterImages": "Extrair imagens dos capítulos",
+    "TaskDownloadMissingSubtitlesDescription": "Procura na Internet legendas em falta com base na configuração dos metadados.",
    "TaskDownloadMissingSubtitles": "Transferir legendas em falta",
-    "TaskRefreshChannelsDescription": "Atualiza as informações do canal da Internet.",
-    "TaskCleanTranscodeDescription": "Apagar os ficheiros com mais de um dia, de Transcode.",
-    "TaskCleanTranscode": "Limpar o diretório de Transcode",
-    "TaskUpdatePluginsDescription": "Baixa e instala as atualizações para plug-ins configurados para atualização automática.",
-    "TaskRefreshPeopleDescription": "Atualizar metadados para elenco e equipa técnica da tua mediateca.",
+    "TaskRefreshChannelsDescription": "Atualiza as informações dos canais da Internet.",
+    "TaskCleanTranscodeDescription": "Elimina ficheiros de transcodificação com mais de um dia.",
+    "TaskCleanTranscode": "Limpar pasta de transcodificação",
+    "TaskUpdatePluginsDescription": "Transfere e instala atualizações dos plugins configurados para atualização automática.",
+    "TaskRefreshPeopleDescription": "Atualiza os metadados de atores e realizadores na tua biblioteca multimédia.",
    "TaskRefreshPeople": "Atualizar pessoas",
-    "TaskRefreshLibraryDescription": "Analisar a mediateca para novos ficheiros e atualizar os metadados.",
-    "TaskCleanActivityLog": "Limpar registro de atividade",
+    "TaskRefreshLibraryDescription": "Analisa a biblioteca multimédia à procura de novos ficheiros e atualiza os metadados.",
+    "TaskCleanActivityLog": "Limpar registo de atividade",
    "Undefined": "Indefinido",
    "Forced": "Forçado",
    "Default": "Predefinição",
-    "TaskCleanActivityLogDescription": "Apaga itens no registro com idade acima do que é configurado.",
+    "TaskCleanActivityLogDescription": "Elimina as entradas do registo de atividade mais antigas do que o período configurado.",
    "TaskOptimizeDatabase": "Otimizar base de dados",
-    "TaskOptimizeDatabaseDescription": "Otimiza e liberta espaço livre na base de dados. A execução desta tarefa depois de analisar a mediateca ou efetuar outras alterações que impliquem modificações na base de dados pode melhorar o desempenho.",
+    "TaskOptimizeDatabaseDescription": "Compacta a base de dados e liberta espaço não utilizado. A execução desta tarefa depois de analisar a biblioteca ou de outras alterações que modifiquem a base de dados pode melhorar o desempenho.",
    "External": "Externo",
-    "HearingImpaired": "Problemas auditivos",
-    "TaskKeyframeExtractor": "Extrator de quadro-chave",
-    "TaskKeyframeExtractorDescription": "Retira frames chave do video para criar listas HLS precisas. Esta tarefa pode correr durante algum tempo.",
-    "TaskRefreshTrickplayImages": "Gerar imagens de Trickplay",
-    "TaskRefreshTrickplayImagesDescription": "Cria miniaturas de pré-visualização (Trickplay) para vídeos nas bibliotecas ativadas.",
+    "HearingImpaired": "Deficiência auditiva",
+    "TaskKeyframeExtractor": "Extrator de fotogramas-chave",
+    "TaskKeyframeExtractorDescription": "Extrai fotogramas-chave de ficheiros de vídeo para criar playlists HLS mais precisas. Esta tarefa pode demorar algum tempo.",
+    "TaskRefreshTrickplayImages": "Gerar imagens de trickplay",
+    "TaskRefreshTrickplayImagesDescription": "Cria pré-visualizações de trickplay para vídeos nas bibliotecas ativadas.",
    "TaskAudioNormalizationDescription": "Analisa os ficheiros para obter dados de normalização de áudio.",
    "TaskAudioNormalization": "Normalização de áudio",
-    "TaskDownloadMissingLyrics": "Transferir letra em falta",
-    "TaskDownloadMissingLyricsDescription": "Transferir letra para músicas",
-    "TaskMoveTrickplayImagesDescription": "Move os ficheiros Trickplay existentes de acordo com as definições da mediateca.",
-    "TaskExtractMediaSegments": "Analisar segmentos de multimédia",
-    "TaskExtractMediaSegmentsDescription": "Extrai ou obtém segmentos de multimédia a partir de plugins com suporte para MediaSegment.",
-    "TaskMoveTrickplayImages": "Migrar a localização das imagens de Trickplay",
-    "CleanupUserDataTask": "Task de limpeza de dados do usuário",
-    "CleanupUserDataTaskDescription": "Remove todos os dados do usuário (progresso, favoritos etc) de mídias que não estão presentes há pelo menos 90 dias.",
+    "TaskDownloadMissingLyrics": "Transferir letras em falta",
+    "TaskDownloadMissingLyricsDescription": "Transfere letras de músicas",
+    "TaskMoveTrickplayImagesDescription": "Move os ficheiros de trickplay existentes de acordo com as definições da biblioteca.",
+    "TaskExtractMediaSegments": "Analisar segmentos multimédia",
+    "TaskExtractMediaSegmentsDescription": "Extrai ou obtém segmentos multimédia de plugins com MediaSegment ativado.",
+    "TaskMoveTrickplayImages": "Migrar localização das imagens de trickplay",
+    "CleanupUserDataTask": "Limpeza de dados de utilizador",
+    "CleanupUserDataTaskDescription": "Remove todos os dados de utilizador (estado de reprodução, estado de favorito, etc.) de conteúdos multimédia que já não estejam presentes há pelo menos 90 dias.",
    "Original": "Original",
-    "LyricDownloadFailureFromForItem": "Erro ao descarregar letras de {0} para {1}",
+    "LyricDownloadFailureFromForItem": "Falha ao transferir letras de {0} para {1}",
    "NameExtraBehindTheScenes": "Bastidores",
-    "NameExtraClip": "Clip",
-    "NameExtraDeletedScene": "Cena Eliminada",
-    "NameExtraFeaturette": "Média-metragem",
+    "NameExtraClip": "Excerto",
+    "NameExtraDeletedScene": "Cena eliminada",
+    "NameExtraFeaturette": "Minidocumentário",
    "NameExtraInterview": "Entrevista",
    "NameExtraSample": "Amostra",
    "NameExtraShort": "Curta-metragem",
-    "NameExtraThemeSong": "Tema Principal",
-    "NameExtraThemeVideo": "Vídeo de Abertura",
+    "NameExtraThemeSong": "Tema musical",
+    "NameExtraThemeVideo": "Vídeo temático",
    "NameExtraScene": "Cena",
    "NameExtraUnknown": "Extra",
-    "NameExtraTrailer": "Trailer"
+    "NameExtraTrailer": "Trailer",
+    "NameExtraNumbered": "{0} {1}"
 }
@@ -108,5 +108,17 @@
    "CleanupUserDataTask": "Sarcina de curatare a datelor utilizatorului",
    "CleanupUserDataTaskDescription": "Sterge toate datele utilizatorului (starea vizionarii, starea favoritelor etc.) de pe suporturile media care nu mai sunt prezente timp de cel puțin 90 de zile.",
    "LyricDownloadFailureFromForItem": "Versurile nu au putut fi descărcate din {0} pentru {1}",
-    "Original": "Original"
+    "Original": "Original",
+    "NameExtraBehindTheScenes": "În culise",
+    "NameExtraClip": "Clip",
+    "NameExtraDeletedScene": "Scenă ștearsă",
+    "NameExtraFeaturette": "Material bonus",
+    "NameExtraInterview": "Interviu",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Monstră",
+    "NameExtraScene": "Scenă",
+    "NameExtraShort": "Scurt",
+    "NameExtraThemeSong": "Audio de Fundal",
+    "NameExtraThemeVideo": "Video de Fundal",
+    "NameExtraTrailer": "Trailer"
 }
@@ -109,7 +109,7 @@
    "CleanupUserDataTaskDescription": "Очищает все пользовательские данные (состояние просмотра, статус избранного и т.д.) с медиа, отсутствующих по меньшей мере в течение 90 дней.",
    "Original": "Оригинальный",
    "LyricDownloadFailureFromForItem": "Не получилось скачать текст песни с {0} для {1}",
-    "NameExtraBehindTheScenes": "За кулисами",
+    "NameExtraBehindTheScenes": "За кадром",
    "NameExtraClip": "Отрывок",
    "NameExtraDeletedScene": "Удалённая сцена",
    "NameExtraFeaturette": "Короткометражка",
@@ -119,5 +119,7 @@
    "NameExtraThemeSong": "Заглавная песня",
    "NameExtraThemeVideo": "Заглавное видео",
    "NameExtraTrailer": "Трейлер",
-    "NameExtraUnknown": "Дополнительный материал"
+    "NameExtraUnknown": "Дополнительный материал",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraShort": "Короткометражка"
 }
@@ -91,7 +91,7 @@
    "Default": "Predvolené",
    "TaskOptimizeDatabaseDescription": "Zmenší databázu a odstráni prázdne miesto. Spustenie tejto úlohy po skenovaní knižnice alebo po iných zmenách zahŕňajúcich úpravy databáze môže zlepšiť výkon.",
    "TaskOptimizeDatabase": "Optimalizovať databázu",
-    "TaskKeyframeExtractorDescription": "Extrahuje kľúčové snímky z video súborov na vytvorenie presnejších HLS playlistov. Táto úloha môže trvať dlhšiu dobu.",
+    "TaskKeyframeExtractorDescription": "Extrahuje kľúčové snímky z videosúborov na vytvorenie presnejších HLS zoznamov. Táto úloha môže trvať dlhší čas.",
    "TaskKeyframeExtractor": "Extraktor kľúčových snímkov",
    "External": "Externé",
    "HearingImpaired": "Sluchovo postihnutí",
@@ -108,5 +108,17 @@
    "CleanupUserDataTask": "Čiščenje uporabniških podatkov",
    "CleanupUserDataTaskDescription": "Izbriše vse uporabniške podatke (stanje ogleda, priljubljene itd.) za vsebine, ki že več kot 90 dni niso na voljo.",
    "LyricDownloadFailureFromForItem": "Besedila ni bilo mogoče prenesti iz {0} za {1}",
-    "Original": "Original"
+    "Original": "Original",
+    "NameExtraBehindTheScenes": "V zakulisju",
+    "NameExtraClip": "Klip",
+    "NameExtraDeletedScene": "Izbrisan prizor",
+    "NameExtraFeaturette": "Kratek dokumentarec o izdelavi filma",
+    "NameExtraInterview": "Intervju",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Vzorec",
+    "NameExtraScene": "Prizor",
+    "NameExtraShort": "Kratki film",
+    "NameExtraThemeSong": "Tematska Pesem",
+    "NameExtraThemeVideo": "Tematski Video",
+    "NameExtraTrailer": "Napovednik"
 }
@@ -108,5 +108,18 @@
    "CleanupUserDataTaskDescription": "Pastron të gjitha të dhënat e përdorueseve (gjendja e shikimit, statusi i të preferuarave etj.) nga mediat që nuk janë më të pranishme për të paktën 90 ditë.",
    "CleanupUserDataTask": "Veprim për pastrimin të dhënave të përdorueseve",
    "LyricDownloadFailureFromForItem": "Teksti i këngës nuk arriti të shkarkohej nga {0} për {1}",
-    "Original": "Origjinal"
+    "Original": "Origjinal",
+    "NameExtraBehindTheScenes": "Pamje nga prapaskenat",
+    "NameExtraClip": "Pjesë",
+    "NameExtraDeletedScene": "Skenë e fshirë",
+    "NameExtraFeaturette": "Film i shkurtër",
+    "NameExtraInterview": "Intervistë",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Shembull",
+    "NameExtraScene": "Skenë",
+    "NameExtraShort": "Film i shkurtër",
+    "NameExtraThemeSong": "Kënga e temës",
+    "NameExtraThemeVideo": "Videoja e temës",
+    "NameExtraTrailer": "Parapamje",
+    "NameExtraUnknown": "Shtesë"
 }
@@ -108,5 +108,18 @@
    "TaskMoveTrickplayImages": "Промени локацију сличица за визуелно премотавање",
    "TaskDownloadMissingLyricsDescription": "Преузми стихове песама",
    "LyricDownloadFailureFromForItem": "Није успело преузимање стихова са {0} за {1}",
-    "Original": "Изворно"
+    "Original": "Изворно",
+    "NameExtraBehindTheScenes": "Иза кулиса",
+    "NameExtraClip": "Исечак",
+    "NameExtraDeletedScene": "Обрисана сцена",
+    "NameExtraFeaturette": "Кратки прилог",
+    "NameExtraInterview": "Интервју",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "Узорак",
+    "NameExtraScene": "Сцена",
+    "NameExtraShort": "Кратки филм",
+    "NameExtraThemeSong": "Музичка тема",
+    "NameExtraThemeVideo": "Спот музичке теме",
+    "NameExtraTrailer": "Реклама",
+    "NameExtraUnknown": "Додатак"
 }
@@ -116,5 +116,10 @@
    "NameExtraScene": "Scen",
    "NameExtraShort": "Kortfilm",
    "NameExtraThemeSong": "Signaturmelodi",
-    "NameExtraTrailer": "Trailer"
+    "NameExtraTrailer": "Trailer",
+    "NameExtraClip": "Klipp",
+    "NameExtraFeaturette": "Kortfilm",
+    "NameExtraSample": "Prov",
+    "NameExtraThemeVideo": "Signaturvideo",
+    "NameExtraUnknown": "Extra"
 }
@@ -106,5 +106,20 @@
    "TaskExtractMediaSegments": "மீடியா பிரிவு ஸ்கேன்",
    "TaskExtractMediaSegmentsDescription": "மீடியாசெக்மென்ட் இயக்கப்பட்ட செருகுநிரல்களிலிருந்து மீடியா பிரிவுகளைப் பிரித்தெடுக்கிறது அல்லது பெறுகிறது.",
    "CleanupUserDataTaskDescription": "குறைந்தது 90 நாட்களுக்கு இல்லாத மீடியாவிலிருந்து அனைத்து பயனர் தரவையும் (கண்காணிப்பு நிலை, பிடித்த நிலை போன்றவை) சுத்தம் செய்கிறது.",
-    "CleanupUserDataTask": "பயனர் தரவை சுத்தம் செய்யும் பணி"
+    "CleanupUserDataTask": "பயனர் தரவை சுத்தம் செய்யும் பணி",
+    "LyricDownloadFailureFromForItem": "{0} இலிருந்து {1} க்கு பாடல் வரிகளைப் பதிவிறக்க முடியவில்லை",
+    "NameExtraBehindTheScenes": "திரைக்குப் பின்னால்",
+    "NameExtraClip": "துண்டுக்காட்சி",
+    "NameExtraDeletedScene": "நீக்கப்பட்ட காட்சிகள்",
+    "NameExtraFeaturette": "திரைப்பின்னணித் தொகுப்பு",
+    "NameExtraInterview": "நேர்காணல்",
+    "NameExtraSample": "மாதிரி",
+    "NameExtraScene": "காட்சி",
+    "NameExtraShort": "குறுகிய",
+    "NameExtraThemeSong": "மையப் பாடல்",
+    "NameExtraThemeVideo": "மையக் காணொளி",
+    "NameExtraTrailer": "முன்னோட்டம்",
+    "NameExtraUnknown": "கூடுதல்",
+    "Original": "அசல்",
+    "NameExtraNumbered": "{0} {1}"
 }
@@ -22,20 +22,20 @@
    "NewVersionIsAvailable": "เวอร์ชันใหม่ของเซิร์ฟเวอร์ Jellyfin พร้อมให้ดาวน์โหลดแล้ว",
    "NameSeasonUnknown": "ไม่ทราบซีซัน",
    "NameSeasonNumber": "ซีซัน {0}",
-    "NameInstallFailed": "การติดตั้ง {0} ล้มเหลว",
+    "NameInstallFailed": "ติดตั้ง {0} ไม่สำเร็จ",
    "MusicVideos": "มิวสิควิดีโอ",
-    "Music": "ดนตรี",
+    "Music": "เพลง",
    "Movies": "ภาพยนตร์",
-    "MixedContent": "เนื้อหาผสม",
-    "Latest": "ล่าสุด",
-    "LabelRunningTimeValue": "ผ่านไปแล้ว: {0}",
-    "LabelIpAddressValue": "ที่อยู่ IP: {0}",
-    "Inherit": "สืบทอด",
-    "HomeVideos": "โฮมวิดีโอ",
-    "HeaderNextUp": "ถัดไป",
-    "HeaderLiveTV": "ทีวีสด",
-    "HeaderFavoriteShows": "รายการที่ชื่นชอบ",
-    "HeaderFavoriteEpisodes": "ตอนที่ชื่นชอบ",
+    "MixedContent": "เนื้อหาหลากหลายประเภท",
+    "Latest": "มาใหม่ล่าสุด",
+    "LabelRunningTimeValue": "ความยาว: {0}",
+    "LabelIpAddressValue": "หมายเลข IP: {0}",
+    "Inherit": "ใช้ค่าเริ่มต้น",
+    "HomeVideos": "วิดีโอส่วนตัว",
+    "HeaderNextUp": "รายการถัดไป",
+    "HeaderLiveTV": "ทีวีถ่ายทอดสด",
+    "HeaderFavoriteShows": "รายการที่ชอบ",
+    "HeaderFavoriteEpisodes": "ตอนที่ชอบ",
    "HeaderContinueWatching": "ดูต่อ",
    "Genres": "ประเภท",
    "Folders": "โฟลเดอร์",
@@ -107,6 +107,19 @@
    "TaskMoveTrickplayImages": "ย้ายตำแหน่งเก็บภาพตัวอย่าง Trickplay",
    "CleanupUserDataTask": "ส่วนงานล้างข้อมูลผู้ใช้",
    "CleanupUserDataTaskDescription": "ล้างข้อมูลผู้ใช้ทั้งหมด (สถานะการรับชม สถานะรายการโปรด ฯลฯ) จากสื่อที่ไม่ได้ใช้งานแล้วอย่างน้อย 90 วัน",
-    "LyricDownloadFailureFromForItem": "ไม่สามารถดาวน์โหลดเนื้อเพลงจาก {0} สำหรับ {1}",
-    "Original": "ต้นฉบับ"
+    "LyricDownloadFailureFromForItem": "ดาวน์โหลดเนื้อเพลงจาก {0} สำหรับ {1} ไม่สำเร็จ",
+    "Original": "ต้นฉบับ",
+    "NameExtraBehindTheScenes": "เบื้องหลังการถ่ายทำ",
+    "NameExtraClip": "คลิปวิดีโอ",
+    "NameExtraDeletedScene": "ฉากที่ถูกตัดออก",
+    "NameExtraFeaturette": "คลิปสั้นพิเศษ",
+    "NameExtraInterview": "บทสัมภาษณ์",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "ตัวอย่าง",
+    "NameExtraScene": "ฉาก",
+    "NameExtraShort": "ภาพยนตร์สั้น",
+    "NameExtraThemeSong": "เพลงประกอบ",
+    "NameExtraThemeVideo": "วิดีโอธีม",
+    "NameExtraTrailer": "ตัวอย่างภาพยนตร์",
+    "NameExtraUnknown": "เนื้อหาพิเศษ"
 }
@@ -1,5 +1,5 @@
 {
-    "AppDeviceValues": "Uygulama: {0}, Aygıt: {1}",
+    "AppDeviceValues": "Uygulama: {0}, Cihaz: {1}",
    "Artists": "Sanatçılar",
    "AuthenticationSucceededWithUserName": "{0} kimliği başarıyla doğrulandı",
    "Books": "Kitaplar",
@@ -115,11 +115,11 @@
    "NameExtraFeaturette": "花絮",
    "NameExtraInterview": "采访",
    "NameExtraNumbered": "{0} {1}",
-    "NameExtraSample": "样本",
-    "NameExtraScene": "场景",
-    "NameExtraShort": "短片",
+    "NameExtraSample": "试看",
+    "NameExtraScene": "精选片段",
+    "NameExtraShort": "短篇",
    "NameExtraThemeSong": "主题曲",
    "NameExtraThemeVideo": "主题视频",
    "NameExtraTrailer": "预告片",
-    "NameExtraUnknown": "额外"
+    "NameExtraUnknown": "额外内容"
 }
@@ -10,8 +10,8 @@
    "Folders": "資料夾",
    "Genres": "風格",
    "HeaderContinueWatching": "繼續睇返",
-    "HeaderFavoriteEpisodes": "心水嘅劇集",
-    "HeaderFavoriteShows": "心水嘅節目",
+    "HeaderFavoriteEpisodes": "心水劇集",
+    "HeaderFavoriteShows": "心水節目",
    "HeaderLiveTV": "電視直播",
    "HeaderNextUp": "跟住落嚟",
    "HomeVideos": "家庭影片",
@@ -108,5 +108,18 @@
    "CleanupUserDataTask": "清理使用者資料嘅任務",
    "CleanupUserDataTaskDescription": "清理已消失至少 90 日嘅媒體用家數據（包括觀看狀態、心水狀態等）。",
    "LyricDownloadFailureFromForItem": "冇辦法從 {0} 下載 {1} 嘅歌詞",
-    "Original": "原始"
+    "Original": "原始",
+    "NameExtraBehindTheScenes": "幕後花絮",
+    "NameExtraClip": "片段",
+    "NameExtraDeletedScene": "刪減場景",
+    "NameExtraFeaturette": "花絮",
+    "NameExtraInterview": "采訪",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "試看",
+    "NameExtraScene": "精選片段",
+    "NameExtraShort": "短篇",
+    "NameExtraThemeSong": "主題曲",
+    "NameExtraThemeVideo": "主題影片",
+    "NameExtraTrailer": "預告片",
+    "NameExtraUnknown": "額外內容"
 }
@@ -108,5 +108,18 @@
    "CleanupUserDataTask": "用戶資料清理工作",
    "CleanupUserDataTaskDescription": "從用戶資料中清除已被刪除超過 90 天的媒體的相關資料。",
    "Original": "原作",
-    "LyricDownloadFailureFromForItem": "無法從 {0} 下載 {1} 的歌詞"
+    "LyricDownloadFailureFromForItem": "無法從 {0} 下載 {1} 的歌詞",
+    "NameExtraBehindTheScenes": "幕後花絮",
+    "NameExtraClip": "片段",
+    "NameExtraDeletedScene": "刪減場景",
+    "NameExtraFeaturette": "花絮",
+    "NameExtraInterview": "采訪",
+    "NameExtraNumbered": "{0} {1}",
+    "NameExtraSample": "試看",
+    "NameExtraScene": "精選片段",
+    "NameExtraShort": "短篇",
+    "NameExtraThemeSong": "主題曲",
+    "NameExtraThemeVideo": "主題影片",
+    "NameExtraTrailer": "預告片",
+    "NameExtraUnknown": "額外內容"
 }
@@ -395,29 +395,11 @@ namespace Emby.Server.Implementations.Plugins
                var url = new Uri(packageInfo.ImageUrl);
                imagePath = Path.Join(path, url.Segments[^1]);

-                var fileStream = AsyncFile.OpenWrite(imagePath);
-                Stream? downloadStream = null;
-                try
+                // The catalog is refreshed on every dashboard visit and rewrites the manifest of
+                // every installed plugin, so only fetch an image that is actually missing.
+                if (!ImageExists(imagePath))
                {
-                    downloadStream = await HttpClientFactory
-                        .CreateClient(NamedClient.Default)
-                        .GetStreamAsync(url)
-                        .ConfigureAwait(false);
-
-                    await downloadStream.CopyToAsync(fileStream).ConfigureAwait(false);
-                }
-                catch (HttpRequestException ex)
-                {
-                    _logger.LogError(ex, "Failed to download image to path {Path} on disk.", imagePath);
-                    imagePath = string.Empty;
-                }
-                finally
-                {
-                    await fileStream.DisposeAsync().ConfigureAwait(false);
-                    if (downloadStream is not null)
-                    {
-                        await downloadStream.DisposeAsync().ConfigureAwait(false);
-                    }
+                    imagePath = await DownloadImage(url, imagePath).ConfigureAwait(false);
                }
            }

@@ -456,6 +438,67 @@ namespace Emby.Server.Implementations.Plugins
            }
        }

+        private static bool ImageExists(string imagePath)
+        {
+            var image = new FileInfo(imagePath);
+
+            // A previous download may have been interrupted, leaving an empty file behind.
+            return image.Exists && image.Length > 0;
+        }
+
+        private async Task<string> DownloadImage(Uri url, string imagePath)
+        {
+            // Download to a temporary file and move it into place, so that neither a failed download
+            // nor a concurrent one can be observed as a partially written image.
+            var tempPath = imagePath + "." + Path.GetRandomFileName();
+
+            try
+            {
+                var fileStream = AsyncFile.Create(tempPath);
+                Stream? downloadStream = null;
+                try
+                {
+                    downloadStream = await HttpClientFactory
+                        .CreateClient(NamedClient.Default)
+                        .GetStreamAsync(url)
+                        .ConfigureAwait(false);
+
+                    await downloadStream.CopyToAsync(fileStream).ConfigureAwait(false);
+                }
+                finally
+                {
+                    await fileStream.DisposeAsync().ConfigureAwait(false);
+                    if (downloadStream is not null)
+                    {
+                        await downloadStream.DisposeAsync().ConfigureAwait(false);
+                    }
+                }
+
+                File.Move(tempPath, imagePath, true);
+
+                return imagePath;
+            }
+            catch (Exception ex) when (ex is HttpRequestException or IOException or UnauthorizedAccessException)
+            {
+                _logger.LogError(ex, "Failed to download image to path {Path} on disk.", imagePath);
+                TryDeleteFile(tempPath);
+
+                return string.Empty;
+            }
+        }
+
+        private void TryDeleteFile(string path)
+        {
+            try
+            {
+                File.Delete(path);
+            }
+            catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
+            {
+                _logger.LogWarning(ex, "Unable to delete {Path}.", path);
+            }
+        }
+
        /// <summary>
        /// Reconciles the manifest against any properties that exist locally in a pre-packaged meta.json found at the path.
        /// If no file is found, no reconciliation occurs.
@@ -174,7 +174,7 @@ public partial class AudioNormalizationTask : IScheduledTask
                if (!t.NormalizationGain.HasValue && !t.LUFS.HasValue && t.IsFileProtocol)
                {
                    t.LUFS = await CalculateLUFSAsync(
-                        string.Format(CultureInfo.InvariantCulture, "-i \"{0}\"", t.Path.Replace("\"", "\\\"", StringComparison.Ordinal)),
+                        string.Format(CultureInfo.InvariantCulture, "-i \"{0}\"", t.Path.EscapeProcessArgument()),
                        false,
                        cancellationToken).ConfigureAwait(false);
                    toSaveDbItems.Add(t);
@@ -11,7 +11,7 @@ using Microsoft.Extensions.Logging;
 namespace Emby.Server.Implementations.ScheduledTasks.Tasks;

 /// <summary>
-/// Optimizes Jellyfin's database by issuing a VACUUM command.
+/// Optimizes Jellyfin's database by issuing VACUUM and ANALYZE commands.
 /// </summary>
 public class OptimizeDatabaseTask : IScheduledTask, IConfigurableScheduledTask
 {
@@ -82,7 +82,7 @@ public class OptimizeDatabaseTask : IScheduledTask, IConfigurableScheduledTask
            return;
        }

-        _logger.LogInformation("Optimizing and vacuuming jellyfin.db...");
+        _logger.LogInformation("Vacuuming and analyzing jellyfin.db...");

        try
        {
@@ -4,6 +4,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using Emby.Server.Implementations.Library.Validators;
 using Jellyfin.Data.Enums;
 using Jellyfin.Database.Implementations;
 using Jellyfin.Database.Implementations.Entities;
@@ -29,6 +30,7 @@ public class PeopleValidationTask : IScheduledTask, IConfigurableScheduledTask
    private readonly IDbContextFactory<JellyfinDbContext> _dbContextFactory;
    private readonly IFileSystem _fileSystem;
    private readonly ILogger<PeopleValidationTask> _logger;
+    private readonly ILogger<PeopleValidator> _validatorLogger;
    private readonly IItemTypeLookup _itemTypeLookup;

    /// <summary>
@@ -39,6 +41,7 @@ public class PeopleValidationTask : IScheduledTask, IConfigurableScheduledTask
    /// <param name="dbContextFactory">Instance of the <see cref="IDbContextFactory{TContext}"/> interface.</param>
    /// <param name="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
    /// <param name="logger">Instance of the <see cref="ILogger{PeopleValidationTask}"/> interface.</param>
+    /// <param name="validatorLogger">Instance of the <see cref="ILogger{PeopleValidator}"/> interface.</param>
    /// <param name="itemTypeLookup">Instance of the <see cref="IItemTypeLookup"/> interface.</param>
    public PeopleValidationTask(
        ILibraryManager libraryManager,
@@ -46,6 +49,7 @@ public class PeopleValidationTask : IScheduledTask, IConfigurableScheduledTask
        IDbContextFactory<JellyfinDbContext> dbContextFactory,
        IFileSystem fileSystem,
        ILogger<PeopleValidationTask> logger,
+        ILogger<PeopleValidator> validatorLogger,
        IItemTypeLookup itemTypeLookup)
    {
        _libraryManager = libraryManager;
@@ -53,6 +57,7 @@ public class PeopleValidationTask : IScheduledTask, IConfigurableScheduledTask
        _dbContextFactory = dbContextFactory;
        _fileSystem = fileSystem;
        _logger = logger;
+        _validatorLogger = validatorLogger;
        _itemTypeLookup = itemTypeLookup;
    }

@@ -109,6 +114,8 @@ public class PeopleValidationTask : IScheduledTask, IConfigurableScheduledTask
            var dupQuery = context.Peoples
                    .GroupBy(e => new { e.Name, e.PersonType })
                    .Where(e => e.Count() > 1)
+                    .OrderBy(e => e.Key.Name)
+                    .ThenBy(e => e.Key.PersonType)
                    .Select(e => e.Select(f => f.Id).ToArray());

            var total = dupQuery.Count();
@@ -163,7 +170,9 @@ public class PeopleValidationTask : IScheduledTask, IConfigurableScheduledTask
        // Phase 2: Validate people (33-66%). Runs after orphaned PeopleBaseItemMap entries are
        // cleaned up above, so dead people are removed in a single pass instead of requiring a second run.
        IProgress<double> validateProgress = new Progress<double>((val) => progress.Report((val / 3) + 33));
-        await _libraryManager.ValidatePeopleAsync(validateProgress, cancellationToken).ConfigureAwait(false);
+        await new PeopleValidator(_libraryManager, _validatorLogger)
+            .Run(validateProgress, cancellationToken)
+            .ConfigureAwait(false);

        // Phase 3: Refresh images for people missing them (66-100%)
        IProgress<double> refreshProgress = new Progress<double>((val) => progress.Report((val / 3) + 66));
@@ -177,33 +186,14 @@ public class PeopleValidationTask : IScheduledTask, IConfigurableScheduledTask
        var thirtyDaysAgo = DateTime.UtcNow.AddDays(-30);
        var personTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Person];

+        List<Guid> peopleIds;
+
        var context = await _dbContextFactory.CreateDbContextAsync(cancellationToken).ConfigureAwait(false);
        await using (context.ConfigureAwait(false))
        {
-            const int PartitionSize = 100;
-
-            var numPeople = await context.BaseItems
-                .AsNoTracking()
-                .Where(b => b.Type == personTypeName)
-                .Where(b => b.DateLastRefreshed == null || b.DateLastRefreshed < thirtyDaysAgo)
-                .Where(b =>
-                    !b.Images!.Any(i => i.ImageType == ImageInfoImageType.Primary) ||
-                    string.IsNullOrEmpty(b.Overview))
-                .CountAsync(cancellationToken)
-                .ConfigureAwait(false);
-
-            _logger.LogDebug("Found {Count} people needing image/overview refresh", numPeople);
-
-            if (numPeople == 0)
-            {
-                progress.Report(100);
-                return;
-            }
-
-            var numComplete = 0;
-            var numRefreshed = 0;
-
-            await foreach (var entry in context.BaseItems
+            // Read the candidates in one go rather than paging them. A refresh stamps the person and takes
+            // it out of this set, so a growing offset over a shrinking set walks past people it never visits.
+            peopleIds = await context.BaseItems
                .AsNoTracking()
                .Where(b => b.Type == personTypeName)
                .Where(b => b.DateLastRefreshed == null || b.DateLastRefreshed < thirtyDaysAgo)
@@ -211,22 +201,36 @@ public class PeopleValidationTask : IScheduledTask, IConfigurableScheduledTask
                    !b.Images!.Any(i => i.ImageType == ImageInfoImageType.Primary) ||
                    string.IsNullOrEmpty(b.Overview))
                .OrderBy(b => b.Id)
-                .WithPartitionProgress(partition => _logger.LogDebug("Processing people partition {Partition}", partition))
-                .PartitionEagerAsync(PartitionSize, cancellationToken)
-                .WithCancellation(cancellationToken)
-                .ConfigureAwait(false))
-            {
-                if (await RefreshPersonAsync(entry.Id, cancellationToken).ConfigureAwait(false))
-                {
-                    numRefreshed++;
-                }
+                .Select(b => b.Id)
+                .ToListAsync(cancellationToken)
+                .ConfigureAwait(false);
+        }

-                numComplete++;
-                progress.Report(100.0 * numComplete / numPeople);
+        _logger.LogDebug("Found {Count} people needing image/overview refresh", peopleIds.Count);
+
+        if (peopleIds.Count == 0)
+        {
+            progress.Report(100);
+            return;
+        }
+
+        var numComplete = 0;
+        var numRefreshed = 0;
+
+        foreach (var personId in peopleIds)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            if (await RefreshPersonAsync(personId, cancellationToken).ConfigureAwait(false))
+            {
+                numRefreshed++;
            }

-            _logger.LogInformation("Refreshed metadata for {Count} people missing images or overview", numRefreshed);
+            numComplete++;
+            progress.Report(100.0 * numComplete / peopleIds.Count);
        }
+
+        _logger.LogInformation("Refreshed metadata for {Count} people missing images or overview", numRefreshed);
    }

    private async Task<bool> RefreshPersonAsync(Guid personId, CancellationToken cancellationToken)
@@ -243,8 +247,8 @@ public class PeopleValidationTask : IScheduledTask, IConfigurableScheduledTask

            var options = new MetadataRefreshOptions(new DirectoryService(_fileSystem))
            {
-                ImageRefreshMode = hasImage ? MetadataRefreshMode.ValidationOnly : MetadataRefreshMode.Default,
-                MetadataRefreshMode = hasOverview ? MetadataRefreshMode.ValidationOnly : MetadataRefreshMode.Default
+                ImageRefreshMode = hasImage ? MetadataRefreshMode.ValidationOnly : MetadataRefreshMode.FullRefresh,
+                MetadataRefreshMode = hasOverview ? MetadataRefreshMode.ValidationOnly : MetadataRefreshMode.FullRefresh
            };

            await item.RefreshMetadata(options, cancellationToken).ConfigureAwait(false);
@@ -107,6 +107,11 @@ public class PluginUpdateTask : IScheduledTask, IConfigurableScheduledTask
            {
                _logger.LogError(ex, "Error updating {Name}", package.Name);
            }
+            catch (TimeoutException ex)
+            {
+                // One slow download must not abort the updates for the remaining plugins.
+                _logger.LogError(ex, "Error downloading {Name}", package.Name);
+            }
            catch (InvalidDataException ex)
            {
                _logger.LogError(ex, "Error updating {Name}", package.Name);
@@ -309,7 +309,7 @@ namespace Emby.Server.Implementations.Session
        {
            if (!session.SessionControllers.Any(i => i.IsSessionActive))
            {
-                var key = GetSessionKey(session.Client, session.DeviceId);
+                var key = GetSessionKey(session.Client, session.DeviceId, session.UserId);

                _activeConnections.TryRemove(key, out _);
                if (!string.IsNullOrEmpty(session.PlayState?.LiveStreamId))
@@ -369,7 +369,7 @@ namespace Emby.Server.Implementations.Session

            if (session is not null)
            {
-                var key = GetSessionKey(session.Client, session.DeviceId);
+                var key = GetSessionKey(session.Client, session.DeviceId, session.UserId);

                _activeConnections.TryRemove(key, out _);

@@ -475,8 +475,11 @@ namespace Emby.Server.Implementations.Session
            }
        }

-        private static string GetSessionKey(string appName, string deviceId)
-            => appName + deviceId;
+        // The user is part of the key because the client name and the device id are taken from the
+        // request headers and are not bound to the access token. Without it, any authenticated user
+        // could claim another user's client/device pair and take over their session.
+        private static string GetSessionKey(string appName, string deviceId, Guid userId)
+            => appName + deviceId + userId.ToString("N", CultureInfo.InvariantCulture);

        /// <summary>
        /// Gets the connection.
@@ -500,7 +503,7 @@ namespace Emby.Server.Implementations.Session

            ArgumentException.ThrowIfNullOrEmpty(deviceId);

-            var key = GetSessionKey(appName, deviceId);
+            var key = GetSessionKey(appName, deviceId, user?.Id ?? Guid.Empty);
            SessionInfo newSession = CreateSessionInfo(key, appName, appVersion, deviceId, deviceName, remoteEndPoint, user);
            SessionInfo sessionInfo = _activeConnections.GetOrAdd(key, newSession);
            if (ReferenceEquals(newSession, sessionInfo))
@@ -655,7 +658,7 @@ namespace Emby.Server.Implementations.Session
                            ItemId = session.NowPlayingItem is null ? Guid.Empty : session.NowPlayingItem.Id,
                            SessionId = session.Id,
                            MediaSourceId = session.PlayState?.MediaSourceId,
-                            PositionTicks = session.PlayState?.PositionTicks
+                            PositionTicks = session.LastPlaybackCheckInPositionTicks
                        }).ConfigureAwait(false);
                    }
                    catch (Exception ex)
@@ -1537,11 +1540,52 @@ namespace Emby.Server.Implementations.Session
            return SendMessageToSession(session, SessionMessageType.Playstate, command, cancellationToken);
        }

-        private static void AssertCanControl(SessionInfo session, SessionInfo controllingSession)
+        private void AssertCanControl(SessionInfo session, SessionInfo controllingSession)
        {
            ArgumentNullException.ThrowIfNull(session);

            ArgumentNullException.ThrowIfNull(controllingSession);
+
+            var controllingUserId = controllingSession.UserId;
+
+            // Controlling a session is always allowed when:
+            // - the caller has no associated user (an API key, which is a privileged context),
+            // - the target session is public (has no owning user), or
+            // - the caller's user is associated with the target session.
+            // Controlling a session owned by a different user requires the
+            // EnableRemoteControlOfOtherUsers permission.
+            if (controllingUserId.IsEmpty()
+                || session.UserId.IsEmpty()
+                || session.ContainsUser(controllingUserId))
+            {
+                return;
+            }
+
+            var controllingUser = _userManager.GetUserById(controllingUserId);
+            if (controllingUser is null
+                || !controllingUser.HasPermission(PermissionKind.EnableRemoteControlOfOtherUsers))
+            {
+                throw new SecurityException("The current user does not have permission to remote control other users.");
+            }
+        }
+
+        private void AssertCanAttachUser(SessionInfo controllingSession, Guid userId)
+        {
+            var controllingUserId = controllingSession.UserId;
+
+            // Playback reported by a session is also written to the user data of its additional users,
+            // so attaching anyone but the calling user requires administrative privileges.
+            if (controllingUserId.IsEmpty() || controllingUserId.Equals(userId))
+            {
+                return;
+            }
+
+            var controllingUser = _userManager.GetUserById(controllingUserId);
+            if (controllingUser is null
+                || !controllingUser.HasPermission(PermissionKind.IsAdministrator))
+            {
+                throw new SecurityException("The current user does not have permission to attach another user to a session.");
+            }
        }

        /// <summary>
@@ -1559,16 +1603,24 @@ namespace Emby.Server.Implementations.Session
        /// <summary>
        /// Adds the additional user.
        /// </summary>
+        /// <param name="controllingSessionId">The controlling session identifier.</param>
        /// <param name="sessionId">The session identifier.</param>
        /// <param name="userId">The user identifier.</param>
-        /// <exception cref="UnauthorizedAccessException">Cannot modify additional users without authenticating first.</exception>
+        /// <exception cref="SecurityException">The controlling user is not allowed to attach the user to the session.</exception>
        /// <exception cref="ArgumentException">The requested user is already the primary user of the session.</exception>
-        public void AddAdditionalUser(string sessionId, Guid userId)
+        public void AddAdditionalUser(string controllingSessionId, string sessionId, Guid userId)
        {
            CheckDisposed();

            var session = GetSession(sessionId);

+            if (!string.IsNullOrEmpty(controllingSessionId))
+            {
+                var controllingSession = GetSession(controllingSessionId);
+                AssertCanControl(session, controllingSession);
+                AssertCanAttachUser(controllingSession, userId);
+            }
+
            if (session.UserId.Equals(userId))
            {
                throw new ArgumentException("The requested user is already the primary user of the session.");
@@ -1576,7 +1628,8 @@ namespace Emby.Server.Implementations.Session

            if (session.AdditionalUsers.All(i => !i.UserId.Equals(userId)))
            {
-                var user = _userManager.GetUserById(userId);
+                var user = _userManager.GetUserById(userId)
+                    ?? throw new ArgumentException("The requested user does not exist.");
                var newUser = new SessionUserInfo
                {
                    UserId = userId,
@@ -1590,16 +1643,22 @@ namespace Emby.Server.Implementations.Session
        /// <summary>
        /// Removes the additional user.
        /// </summary>
+        /// <param name="controllingSessionId">The controlling session identifier.</param>
        /// <param name="sessionId">The session identifier.</param>
        /// <param name="userId">The user identifier.</param>
-        /// <exception cref="UnauthorizedAccessException">Cannot modify additional users without authenticating first.</exception>
+        /// <exception cref="SecurityException">The controlling user is not allowed to control the session.</exception>
        /// <exception cref="ArgumentException">The requested user is already the primary user of the session.</exception>
-        public void RemoveAdditionalUser(string sessionId, Guid userId)
+        public void RemoveAdditionalUser(string controllingSessionId, string sessionId, Guid userId)
        {
            CheckDisposed();

            var session = GetSession(sessionId);

+            if (!string.IsNullOrEmpty(controllingSessionId))
+            {
+                AssertCanControl(session, GetSession(controllingSessionId));
+            }
+
            if (session.UserId.Equals(userId))
            {
                throw new ArgumentException("The requested user is already the primary user of the session.");
@@ -1803,14 +1862,21 @@ namespace Emby.Server.Implementations.Session
        /// <summary>
        /// Reports the capabilities.
        /// </summary>
+        /// <param name="controllingSessionId">The controlling session identifier.</param>
        /// <param name="sessionId">The session identifier.</param>
        /// <param name="capabilities">The capabilities.</param>
-        public void ReportCapabilities(string sessionId, ClientCapabilities capabilities)
+        /// <exception cref="SecurityException">The controlling user is not allowed to control the session.</exception>
+        public void ReportCapabilities(string controllingSessionId, string sessionId, ClientCapabilities capabilities)
        {
            CheckDisposed();

            var session = GetSession(sessionId);

+            if (!string.IsNullOrEmpty(controllingSessionId))
+            {
+                AssertCanControl(session, GetSession(controllingSessionId));
+            }
+
            ReportCapabilities(session, capabilities, true);
        }

@@ -1905,13 +1971,18 @@ namespace Emby.Server.Implementations.Session
        }

        /// <inheritdoc />
-        public void ReportNowViewingItem(string sessionId, string itemId)
+        public void ReportNowViewingItem(string controllingSessionId, string sessionId, string itemId)
        {
            ArgumentException.ThrowIfNullOrEmpty(itemId);

            var item = _libraryManager.GetItemById(new Guid(itemId));
            var session = GetSession(sessionId);

+            if (!string.IsNullOrEmpty(controllingSessionId))
+            {
+                AssertCanControl(session, GetSession(controllingSessionId));
+            }
+
            session.NowViewingItem = GetItemInfo(item, null);
        }

@@ -90,6 +90,18 @@ namespace Emby.Server.Implementations.SyncPlay
        /// <value>The default ping.</value>
        public long DefaultPing { get; } = 500;

+        /// <summary>
+        /// Gets the maximum ping, in milliseconds, accepted from a session.
+        /// </summary>
+        /// <remarks>
+        /// Pings are reported by clients and are scaled into the delays used to schedule playback,
+        /// so an unbounded value lets a single session push the whole group's resume point
+        /// arbitrarily far out, or overflow the arithmetic entirely. Anything above this is not a
+        /// usable measurement for synchronisation.
+        /// </remarks>
+        /// <value>The maximum ping.</value>
+        public long MaxPing { get; } = 10000;
+
        /// <summary>
        /// Gets the maximum time offset error accepted for dates reported by clients, in milliseconds.
        /// </summary>
@@ -438,7 +450,7 @@ namespace Emby.Server.Implementations.SyncPlay
        {
            if (_participants.TryGetValue(session.Id, out GroupMember value))
            {
-                value.Ping = ping;
+                value.Ping = Math.Clamp(ping, 0, MaxPing);
            }
        }

@@ -451,7 +463,9 @@ namespace Emby.Server.Implementations.SyncPlay
                max = Math.Max(max, session.Ping);
            }

-            return max;
+            // A group with no participants has no ping to report. Returning long.MinValue would
+            // overflow the callers that scale this value into ticks, so fall back to the default.
+            return max == long.MinValue ? DefaultPing : max;
        }

        /// <inheritdoc />
@@ -181,8 +181,8 @@ namespace Emby.Server.Implementations.SyncPlay
                    {
                        if (existingGroup.GroupId.Equals(request.GroupId))
                        {
-                            // Restore session.
-                            UpdateSessionsCounter(session.UserId, 1);
+                            // Restore session. The session is already in the group and has already
+                            // been counted, so the counter must not be incremented a second time.
                            group.SessionJoin(session, request, cancellationToken);
                            return;
                        }
@@ -332,8 +332,11 @@ namespace Emby.Server.Implementations.SyncPlay
                // Group lock required as Group is not thread-safe.
                lock (group)
                {
-                    // Make sure that session still belongs to this group.
-                    if (_sessionToGroupMap.TryGetValue(session.Id, out var checkGroup) && !checkGroup.GroupId.Equals(group.GroupId))
+                    // Make sure that session still belongs to this group. The lookup can fail
+                    // outright when the session left while this request was waiting on the group
+                    // lock, which is exactly the case this re-check exists to catch.
+                    if (!_sessionToGroupMap.TryGetValue(session.Id, out var checkGroup)
+                        || !checkGroup.GroupId.Equals(group.GroupId))
                    {
                        // Drop request.
                        return;
@@ -400,7 +403,7 @@ namespace Emby.Server.Implementations.SyncPlay
            // Update sessions counter.
            var newSessionsCounter = _activeUsers.AddOrUpdate(
                userId,
-                1,
+                toAdd,
                (_, sessionsCounter) => sessionsCounter + toAdd);

            // Should never happen.
@@ -11,7 +11,6 @@ using System.Security.Cryptography;
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
-using Jellyfin.Data.Events;
 using Jellyfin.Extensions;
 using Jellyfin.Extensions.Json;
 using MediaBrowser.Common.Configuration;
@@ -34,6 +33,9 @@ namespace Emby.Server.Implementations.Updates
    public class InstallationManager : IInstallationManager
    {
        private static readonly SearchValues<char> InvalidPackageNameChars = SearchValues.Create([.. Path.GetInvalidFileNameChars(), '/', '\\']);
+        // Budget for the whole package download. The response headers are already bounded by the
+        // HttpClient timeout; this covers reading the package body, which can be large and slow.
+        private static readonly TimeSpan PackageDownloadTimeout = TimeSpan.FromMinutes(10);

        /// <summary>
        /// The logger.
@@ -82,8 +84,8 @@ namespace Emby.Server.Implementations.Updates
            IServerConfigurationManager config,
            IPluginManager pluginManager)
        {
-            _currentInstallations = new List<(InstallationInfo, CancellationTokenSource)>();
-            _completedInstallationsInternal = new ConcurrentBag<InstallationInfo>();
+            _currentInstallations = [];
+            _completedInstallationsInternal = [];

            _logger = logger;
            _applicationHost = appHost;
@@ -341,8 +343,9 @@ namespace Emby.Server.Implementations.Updates

                _applicationHost.NotifyPendingRestart();
            }
-            catch (OperationCanceledException)
+            catch (OperationCanceledException) when (linkedToken.IsCancellationRequested)
            {
+                // Only an actually cancelled token is a cancellation.
                lock (_currentInstallationsLock)
                {
                    _currentInstallations.Remove(tuple);
@@ -356,7 +359,7 @@ namespace Emby.Server.Implementations.Updates
            }
            catch (Exception ex)
            {
-                _logger.LogError(ex, "Package installation failed");
+                _logger.LogError(ex, "Package installation failed: {Name} {Version}", package.Name, package.Version);

                lock (_currentInstallationsLock)
                {
@@ -546,12 +549,36 @@ namespace Emby.Server.Implementations.Updates
                throw new InvalidDataException($"Plugin package name '{package.Name}' resolves outside the plugins directory.");
            }

-            using var response = await _httpClientFactory.CreateClient(NamedClient.Default)
-                .GetAsync(new Uri(package.SourceUrl), cancellationToken).ConfigureAwait(false);
-            response.EnsureSuccessStatusCode();
-            Stream stream = await response.Content.ReadAsStreamAsync(cancellationToken).ConfigureAwait(false);
-            await using (stream.ConfigureAwait(false))
+            // ResponseHeadersRead keeps the body out of the HttpClient timeout, which otherwise covers
+            // the whole download; the package gets the longer budget below instead.
+            using var downloadTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
+            downloadTokenSource.CancelAfter(PackageDownloadTimeout);
+            var downloadToken = downloadTokenSource.Token;
+
+            var buffer = new MemoryStream();
+            await using (buffer.ConfigureAwait(false))
            {
+                try
+                {
+                    using var response = await _httpClientFactory.CreateClient(NamedClient.Default)
+                        .GetAsync(new Uri(package.SourceUrl), HttpCompletionOption.ResponseHeadersRead, downloadToken).ConfigureAwait(false);
+                    response.EnsureSuccessStatusCode();
+
+                    // The package is read twice, for the checksum and for the extraction, so it has
+                    // to be buffered: the response stream is not seekable.
+                    await response.Content.CopyToAsync(buffer, downloadToken).ConfigureAwait(false);
+                }
+                catch (OperationCanceledException ex) when (!cancellationToken.IsCancellationRequested)
+                {
+                    // Either our budget above or the HttpClient timeout ran out.
+                    throw new TimeoutException(
+                        $"Downloading the package {package.Name} {package.Version} from {package.SourceUrl} timed out.",
+                        ex);
+                }
+
+                buffer.Position = 0;
+                Stream stream = buffer;
+
                // CA5351: Do Not Use Broken Cryptographic Algorithms
 #pragma warning disable CA5351
                cancellationToken.ThrowIfCancellationRequested();
@@ -126,6 +126,12 @@ public class ArtistsController : BaseJellyfinApiController
        var dtoOptions = new DtoOptions { Fields = fields }
            .AddAdditionalDtoOptions(enableImages, enableUserData, imageTypeLimit, enableImageTypes);

+        // Asking for a type filter has always implied wanting that type's counts back.
+        if (includeItemTypes.Length != 0 && !dtoOptions.ContainsField(ItemFields.ItemCounts))
+        {
+            dtoOptions.Fields = [.. dtoOptions.Fields, ItemFields.ItemCounts];
+        }
+
        User? user = null;
        BaseItem parentItem = _libraryManager.GetParentItem(parentId, userId);

@@ -193,31 +199,7 @@ public class ArtistsController : BaseJellyfinApiController

        var result = _libraryManager.GetArtists(query);

-        var dtos = result.Items.Select(i =>
-        {
-            var (baseItem, itemCounts) = i;
-            var dto = _dtoService.GetItemByNameDto(baseItem, dtoOptions, null, user);
-
-            if (includeItemTypes.Length != 0)
-            {
-                dto.ChildCount = itemCounts.ItemCount;
-                dto.ProgramCount = itemCounts.ProgramCount;
-                dto.SeriesCount = itemCounts.SeriesCount;
-                dto.EpisodeCount = itemCounts.EpisodeCount;
-                dto.MovieCount = itemCounts.MovieCount;
-                dto.TrailerCount = itemCounts.TrailerCount;
-                dto.AlbumCount = itemCounts.AlbumCount;
-                dto.SongCount = itemCounts.SongCount;
-                dto.ArtistCount = itemCounts.ArtistCount;
-            }
-
-            return dto;
-        });
-
-        return new QueryResult<BaseItemDto>(
-            query.StartIndex,
-            result.TotalRecordCount,
-            dtos.ToArray());
+        return RequestHelpers.CreateQueryResult(result, dtoOptions, _dtoService, user);
    }

    /// <summary>
@@ -298,6 +280,12 @@ public class ArtistsController : BaseJellyfinApiController
        var dtoOptions = new DtoOptions { Fields = fields }
            .AddAdditionalDtoOptions(enableImages, enableUserData, imageTypeLimit, enableImageTypes);

+        // Asking for a type filter has always implied wanting that type's counts back.
+        if (includeItemTypes.Length != 0 && !dtoOptions.ContainsField(ItemFields.ItemCounts))
+        {
+            dtoOptions.Fields = [.. dtoOptions.Fields, ItemFields.ItemCounts];
+        }
+
        User? user = null;
        BaseItem parentItem = _libraryManager.GetParentItem(parentId, userId);

@@ -365,31 +353,7 @@ public class ArtistsController : BaseJellyfinApiController

        var result = _libraryManager.GetAlbumArtists(query);

-        var dtos = result.Items.Select(i =>
-        {
-            var (baseItem, itemCounts) = i;
-            var dto = _dtoService.GetItemByNameDto(baseItem, dtoOptions, null, user);
-
-            if (includeItemTypes.Length != 0)
-            {
-                dto.ChildCount = itemCounts.ItemCount;
-                dto.ProgramCount = itemCounts.ProgramCount;
-                dto.SeriesCount = itemCounts.SeriesCount;
-                dto.EpisodeCount = itemCounts.EpisodeCount;
-                dto.MovieCount = itemCounts.MovieCount;
-                dto.TrailerCount = itemCounts.TrailerCount;
-                dto.AlbumCount = itemCounts.AlbumCount;
-                dto.SongCount = itemCounts.SongCount;
-                dto.ArtistCount = itemCounts.ArtistCount;
-            }
-
-            return dto;
-        });
-
-        return new QueryResult<BaseItemDto>(
-            query.StartIndex,
-            result.TotalRecordCount,
-            dtos.ToArray());
+        return RequestHelpers.CreateQueryResult(result, dtoOptions, _dtoService, user);
    }

    /// <summary>
@@ -20,7 +20,6 @@ using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.MediaEncoding;
 using MediaBrowser.Controller.Streaming;
-using MediaBrowser.MediaEncoding.Encoder;
 using MediaBrowser.Model.Configuration;
 using MediaBrowser.Model.Dlna;
 using MediaBrowser.Model.Entities;
@@ -1652,9 +1651,9 @@ public class DynamicHlsController : BaseJellyfinApiController
            segmentFormat,
            startNumber.ToString(CultureInfo.InvariantCulture),
            baseUrlParam,
-            EncodingUtils.NormalizePath(outputTsArg),
+            outputTsArg.EscapeProcessArgument(),
            hlsArguments,
-            EncodingUtils.NormalizePath(outputPath)).Trim();
+            outputPath.EscapeProcessArgument()).Trim();
    }

    /// <summary>
@@ -97,6 +97,12 @@ public class GenresController : BaseJellyfinApiController
        var dtoOptions = new DtoOptions { Fields = fields }
            .AddAdditionalDtoOptions(enableImages, false, imageTypeLimit, enableImageTypes);

+        // Asking for a type filter has always implied wanting that type's counts back.
+        if (includeItemTypes.Length != 0 && !dtoOptions.ContainsField(ItemFields.ItemCounts))
+        {
+            dtoOptions.Fields = [.. dtoOptions.Fields, ItemFields.ItemCounts];
+        }
+
        User? user = userId.IsNullOrEmpty()
            ? null
            : _userManager.GetUserById(userId.Value);
@@ -143,8 +149,7 @@ public class GenresController : BaseJellyfinApiController
            result = _libraryManager.GetGenres(query);
        }

-        var shouldIncludeItemTypes = includeItemTypes.Length != 0;
-        return RequestHelpers.CreateQueryResult(result, dtoOptions, _dtoService, shouldIncludeItemTypes, user);
+        return RequestHelpers.CreateQueryResult(result, dtoOptions, _dtoService, user);
    }

    /// <summary>
@@ -13,6 +13,7 @@ using MediaBrowser.Controller.Entities.Movies;
 using MediaBrowser.Controller.Entities.TV;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.Providers;
+using MediaBrowser.Model.Entities;
 using MediaBrowser.Model.IO;
 using MediaBrowser.Model.Providers;
 using Microsoft.AspNetCore.Authorization;
@@ -263,7 +264,7 @@ public class ItemLookupController : BaseJellyfinApiController
            searchResult.ProviderIds);

        // Since the refresh process won't erase provider Ids, we need to set this explicitly now.
-        item.ProviderIds = searchResult.ProviderIds;
+        item.SetProviderIds(searchResult.ProviderIds);
        await _providerManager.RefreshFullItem(
            item,
            new MetadataRefreshOptions(new DirectoryService(_fileSystem))
@@ -428,15 +428,7 @@ public class ItemUpdateController : BaseJellyfinApiController

        if (request.ProviderIds is not null)
        {
-            foreach (var pair in request.ProviderIds.ToList())
-            {
-                if (string.IsNullOrEmpty(pair.Value))
-                {
-                    request.ProviderIds.Remove(pair.Key);
-                }
-            }
-
-            item.ProviderIds = request.ProviderIds;
+            item.SetProviderIds(request.ProviderIds);
        }

        if (item is Video video)
@@ -14,7 +14,9 @@ using MediaBrowser.Common.Api;
 using MediaBrowser.Controller;
 using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.IO;
 using MediaBrowser.Controller.Library;
+using MediaBrowser.Controller.Providers;
 using MediaBrowser.Model.Configuration;
 using MediaBrowser.Model.Entities;
 using Microsoft.AspNetCore.Authorization;
@@ -33,6 +35,7 @@ public class LibraryStructureController : BaseJellyfinApiController
    private readonly IServerApplicationPaths _appPaths;
    private readonly ILibraryManager _libraryManager;
    private readonly ILibraryMonitor _libraryMonitor;
+    private readonly IDirectoryService _directoryService;

    /// <summary>
    /// Initializes a new instance of the <see cref="LibraryStructureController"/> class.
@@ -40,14 +43,17 @@ public class LibraryStructureController : BaseJellyfinApiController
    /// <param name="serverConfigurationManager">Instance of <see cref="IServerConfigurationManager"/> interface.</param>
    /// <param name="libraryManager">Instance of <see cref="ILibraryManager"/> interface.</param>
    /// <param name="libraryMonitor">Instance of <see cref="ILibraryMonitor"/> interface.</param>
+    /// <param name="directoryService">Instance of <see cref="IDirectoryService"/> interface.</param>
    public LibraryStructureController(
        IServerConfigurationManager serverConfigurationManager,
        ILibraryManager libraryManager,
-        ILibraryMonitor libraryMonitor)
+        ILibraryMonitor libraryMonitor,
+        IDirectoryService directoryService)
    {
        _appPaths = serverConfigurationManager.ApplicationPaths;
        _libraryManager = libraryManager;
        _libraryMonitor = libraryMonitor;
+        _directoryService = directoryService;
    }

    /// <summary>
@@ -122,12 +128,14 @@ public class LibraryStructureController : BaseJellyfinApiController
    /// <param name="newName">The new name.</param>
    /// <param name="refreshLibrary">Whether to refresh the library.</param>
    /// <response code="204">Folder renamed.</response>
+    /// <response code="400">The new name is not a valid library name.</response>
    /// <response code="404">Library doesn't exist.</response>
    /// <response code="409">Library already exists.</response>
-    /// <returns>A <see cref="NoContentResult"/> on success, a <see cref="NotFoundResult"/> if the library doesn't exist, a <see cref="ConflictResult"/> if the new name is already taken.</returns>
+    /// <returns>A <see cref="NoContentResult"/> on success, a <see cref="BadRequestResult"/> if the new name is invalid, a <see cref="NotFoundResult"/> if the library doesn't exist, a <see cref="ConflictResult"/> if the new name is already taken.</returns>
    /// <exception cref="ArgumentNullException">The new name may not be null.</exception>
    [HttpPost("Name")]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    [ProducesResponseType(StatusCodes.Status409Conflict)]
    public ActionResult RenameVirtualFolder(
@@ -147,10 +155,15 @@ public class LibraryStructureController : BaseJellyfinApiController

        var rootFolderPath = _appPaths.DefaultUserViewsPath;

-        var currentPath = Path.Combine(rootFolderPath, name);
-        var newPath = Path.Combine(rootFolderPath, newName);
+        // Both names are caller supplied, so they have to be confined to the libraries root.
+        var newPath = FileSystemHelper.GetChildPath(rootFolderPath, newName);
+        if (newPath is null)
+        {
+            return BadRequest("The new name is not a valid library name.");
+        }

-        if (!Directory.Exists(currentPath))
+        var currentPath = FileSystemHelper.GetChildPath(rootFolderPath, name);
+        if (currentPath is null || !Directory.Exists(currentPath))
        {
            return NotFound("The media collection does not exist.");
        }
@@ -170,11 +183,11 @@ public class LibraryStructureController : BaseJellyfinApiController
                var tempPath = Path.Combine(
                    rootFolderPath,
                    Guid.NewGuid().ToString("N", CultureInfo.InvariantCulture));
-                Directory.Move(currentPath, tempPath);
+                _directoryService.Move(currentPath, tempPath);
                currentPath = tempPath;
            }

-            Directory.Move(currentPath, newPath);
+            _directoryService.Move(currentPath, newPath);
        }
        finally
        {
@@ -98,6 +98,12 @@ public class MusicGenresController : BaseJellyfinApiController
        var dtoOptions = new DtoOptions { Fields = fields }
            .AddAdditionalDtoOptions(enableImages, false, imageTypeLimit, enableImageTypes);

+        // Asking for a type filter has always implied wanting that type's counts back.
+        if (includeItemTypes.Length != 0 && !dtoOptions.ContainsField(ItemFields.ItemCounts))
+        {
+            dtoOptions.Fields = [.. dtoOptions.Fields, ItemFields.ItemCounts];
+        }
+
        User? user = userId.IsNullOrEmpty()
            ? null
            : _userManager.GetUserById(userId.Value);
@@ -134,8 +140,7 @@ public class MusicGenresController : BaseJellyfinApiController

        var result = _libraryManager.GetMusicGenres(query);

-        var shouldIncludeItemTypes = includeItemTypes.Length != 0;
-        return RequestHelpers.CreateQueryResult(result, dtoOptions, _dtoService, shouldIncludeItemTypes, user);
+        return RequestHelpers.CreateQueryResult(result, dtoOptions, _dtoService, user);
    }

    /// <summary>
@@ -3,7 +3,9 @@ using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 using System.Linq;
 using System.Threading.Tasks;
+using Jellyfin.Extensions;
 using MediaBrowser.Common.Api;
+using MediaBrowser.Common.Plugins;
 using MediaBrowser.Common.Updates;
 using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Model.Updates;
@@ -23,16 +25,22 @@ public class PackageController : BaseJellyfinApiController
 {
    private readonly IInstallationManager _installationManager;
    private readonly IServerConfigurationManager _serverConfigurationManager;
+    private readonly IPluginManager _pluginManager;

    /// <summary>
    /// Initializes a new instance of the <see cref="PackageController"/> class.
    /// </summary>
    /// <param name="installationManager">Instance of the <see cref="IInstallationManager"/> interface.</param>
    /// <param name="serverConfigurationManager">Instance of the <see cref="IServerConfigurationManager"/> interface.</param>
-    public PackageController(IInstallationManager installationManager, IServerConfigurationManager serverConfigurationManager)
+    /// <param name="pluginManager">Instance of the <see cref="IPluginManager"/> interface.</param>
+    public PackageController(
+        IInstallationManager installationManager,
+        IServerConfigurationManager serverConfigurationManager,
+        IPluginManager pluginManager)
    {
        _installationManager = installationManager;
        _serverConfigurationManager = serverConfigurationManager;
+        _pluginManager = pluginManager;
    }

    /// <summary>
@@ -48,6 +56,13 @@ public class PackageController : BaseJellyfinApiController
        [FromRoute, Required] string name,
        [FromQuery] Guid? assemblyGuid)
    {
+        // Plugins bundled with the server are not published to any repository, so querying
+        // the configured repositories for them can only ever fail, and does so slowly.
+        if (IsBundledPlugin(name, assemblyGuid))
+        {
+            return NotFound();
+        }
+
        var packages = await _installationManager.GetAvailablePackages().ConfigureAwait(false);
        var result = _installationManager.FilterPackages(
                packages,
@@ -96,6 +111,11 @@ public class PackageController : BaseJellyfinApiController
        [FromQuery] string? version,
        [FromQuery] string? repositoryUrl)
    {
+        if (IsBundledPlugin(name, assemblyGuid))
+        {
+            return NotFound();
+        }
+
        var packages = await _installationManager.GetAvailablePackages().ConfigureAwait(false);
        if (!string.IsNullOrEmpty(repositoryUrl))
        {
@@ -161,4 +181,13 @@ public class PackageController : BaseJellyfinApiController
        _serverConfigurationManager.SaveConfiguration();
        return NoContent();
    }
+
+    private bool IsBundledPlugin(string name, Guid? assemblyGuid)
+    {
+        var plugin = assemblyGuid is Guid id && !id.IsEmpty()
+            ? _pluginManager.GetPlugin(id)
+            : _pluginManager.Plugins.FirstOrDefault(p => p.Name.Equals(name, StringComparison.OrdinalIgnoreCase));
+
+        return plugin?.Instance?.CanUninstall == false;
+    }
 }
@@ -521,7 +521,7 @@ public class PlaylistsController : BaseJellyfinApiController
        [FromQuery] int? imageTypeLimit,
        [FromQuery, ModelBinder(typeof(CommaDelimitedCollectionModelBinder))] ImageType[] enableImageTypes)
    {
-        var callingUserId = userId ?? User.GetUserId();
+        var callingUserId = RequestHelpers.GetUserId(User, userId);
        var playlist = _playlistManager.GetPlaylistForUser(playlistId, callingUserId);
        if (playlist is null)
        {
@@ -306,11 +306,14 @@ public class SessionController : BaseJellyfinApiController
    [HttpPost("Sessions/{sessionId}/User/{userId}")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
-    public ActionResult AddUserToSession(
+    public async Task<ActionResult> AddUserToSession(
        [FromRoute, Required] string sessionId,
        [FromRoute, Required] Guid userId)
    {
-        _sessionManager.AddAdditionalUser(sessionId, userId);
+        _sessionManager.AddAdditionalUser(
+            await RequestHelpers.GetSessionId(_sessionManager, _userManager, HttpContext).ConfigureAwait(false),
+            sessionId,
+            userId);
        return NoContent();
    }

@@ -324,11 +327,14 @@ public class SessionController : BaseJellyfinApiController
    [HttpDelete("Sessions/{sessionId}/User/{userId}")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
-    public ActionResult RemoveUserFromSession(
+    public async Task<ActionResult> RemoveUserFromSession(
        [FromRoute, Required] string sessionId,
        [FromRoute, Required] Guid userId)
    {
-        _sessionManager.RemoveAdditionalUser(sessionId, userId);
+        _sessionManager.RemoveAdditionalUser(
+            await RequestHelpers.GetSessionId(_sessionManager, _userManager, HttpContext).ConfigureAwait(false),
+            sessionId,
+            userId);
        return NoContent();
    }

@@ -352,12 +358,13 @@ public class SessionController : BaseJellyfinApiController
        [FromQuery] bool supportsMediaControl = false,
        [FromQuery] bool supportsPersistentIdentifier = true)
    {
+        var currentSessionId = await RequestHelpers.GetSessionId(_sessionManager, _userManager, HttpContext).ConfigureAwait(false);
        if (string.IsNullOrWhiteSpace(id))
        {
-            id = await RequestHelpers.GetSessionId(_sessionManager, _userManager, HttpContext).ConfigureAwait(false);
+            id = currentSessionId;
        }

-        _sessionManager.ReportCapabilities(id, new ClientCapabilities
+        _sessionManager.ReportCapabilities(currentSessionId, id, new ClientCapabilities
        {
            PlayableMediaTypes = playableMediaTypes,
            SupportedCommands = supportedCommands,
@@ -381,12 +388,13 @@ public class SessionController : BaseJellyfinApiController
        [FromQuery] string? id,
        [FromBody, Required] ClientCapabilitiesDto capabilities)
    {
+        var currentSessionId = await RequestHelpers.GetSessionId(_sessionManager, _userManager, HttpContext).ConfigureAwait(false);
        if (string.IsNullOrWhiteSpace(id))
        {
-            id = await RequestHelpers.GetSessionId(_sessionManager, _userManager, HttpContext).ConfigureAwait(false);
+            id = currentSessionId;
        }

-        _sessionManager.ReportCapabilities(id, capabilities.ToClientCapabilities());
+        _sessionManager.ReportCapabilities(currentSessionId, id, capabilities.ToClientCapabilities());

        return NoContent();
    }
@@ -405,9 +413,9 @@ public class SessionController : BaseJellyfinApiController
        [FromQuery] string? sessionId,
        [FromQuery, Required] string? itemId)
    {
-        string session = sessionId ?? await RequestHelpers.GetSessionId(_sessionManager, _userManager, HttpContext).ConfigureAwait(false);
+        var currentSessionId = await RequestHelpers.GetSessionId(_sessionManager, _userManager, HttpContext).ConfigureAwait(false);

-        _sessionManager.ReportNowViewingItem(session, itemId);
+        _sessionManager.ReportNowViewingItem(currentSessionId, sessionId ?? currentSessionId, itemId);
        return NoContent();
    }

@@ -92,6 +92,12 @@ public class StudiosController : BaseJellyfinApiController
        var dtoOptions = new DtoOptions { Fields = fields }
            .AddAdditionalDtoOptions(enableImages, enableUserData, imageTypeLimit, enableImageTypes);

+        // Asking for a type filter has always implied wanting that type's counts back.
+        if (includeItemTypes.Length != 0 && !dtoOptions.ContainsField(ItemFields.ItemCounts))
+        {
+            dtoOptions.Fields = [.. dtoOptions.Fields, ItemFields.ItemCounts];
+        }
+
        User? user = userId.IsNullOrEmpty()
            ? null
            : _userManager.GetUserById(userId.Value);
@@ -126,8 +132,7 @@ public class StudiosController : BaseJellyfinApiController
        }

        var result = _libraryManager.GetStudios(query);
-        var shouldIncludeItemTypes = includeItemTypes.Length != 0;
-        return RequestHelpers.CreateQueryResult(result, dtoOptions, _dtoService, shouldIncludeItemTypes, user);
+        return RequestHelpers.CreateQueryResult(result, dtoOptions, _dtoService, user);
    }

    /// <summary>
@@ -557,7 +557,7 @@ public class SubtitleController : BaseJellyfinApiController
        if (!string.IsNullOrEmpty(fallbackFontPath))
        {
            var fontFile = _fileSystem.GetFiles(fallbackFontPath)
-                .First(i => string.Equals(i.Name, name, StringComparison.OrdinalIgnoreCase));
+                .FirstOrDefault(i => string.Equals(i.Name, name, StringComparison.OrdinalIgnoreCase));
            var fileSize = fontFile?.Length;

            if (fontFile is not null && fileSize is not null && fileSize > 0)
@@ -34,6 +34,8 @@ namespace Jellyfin.Api.Controllers;
 [Tags("Library")]
 public class UserLibraryController : BaseJellyfinApiController
 {
+    private static readonly TimeSpan RefreshOnDemandTimeout = TimeSpan.FromSeconds(3);
+
    private readonly IUserManager _userManager;
    private readonly IUserDataManager _userDataRepository;
    private readonly ILibraryManager _libraryManager;
@@ -79,7 +81,7 @@ public class UserLibraryController : BaseJellyfinApiController
    /// <returns>An <see cref="OkResult"/> containing the item.</returns>
    [HttpGet("Items/{itemId}")]
    [ProducesResponseType(StatusCodes.Status200OK)]
-    public ActionResult<BaseItemDto> GetItem(
+    public async Task<ActionResult<BaseItemDto>> GetItem(
        [FromQuery] Guid? userId,
        [FromRoute, Required] Guid itemId)
    {
@@ -98,7 +100,7 @@ public class UserLibraryController : BaseJellyfinApiController
            return NotFound();
        }

-        QueueRefreshOnDemandIfNeeded(item);
+        await RefreshOnDemandIfNeeded(item).ConfigureAwait(false);

        var dtoOptions = new DtoOptions();

@@ -116,7 +118,7 @@ public class UserLibraryController : BaseJellyfinApiController
    [ProducesResponseType(StatusCodes.Status200OK)]
    [Obsolete("Kept for backwards compatibility")]
    [ApiExplorerSettings(IgnoreApi = true)]
-    public ActionResult<BaseItemDto> GetItemLegacy(
+    public Task<ActionResult<BaseItemDto>> GetItemLegacy(
        [FromRoute, Required] Guid userId,
        [FromRoute, Required] Guid itemId)
        => GetItem(userId, itemId);
@@ -643,7 +645,7 @@ public class UserLibraryController : BaseJellyfinApiController
            limit,
            groupItems);

-    private void QueueRefreshOnDemandIfNeeded(BaseItem item)
+    private async Task RefreshOnDemandIfNeeded(BaseItem item)
    {
        if (item is not Person)
        {
@@ -656,15 +658,24 @@ public class UserLibraryController : BaseJellyfinApiController
            return;
        }

-        _providerManager.QueueRefresh(
-            item.Id,
-            new MetadataRefreshOptions(new DirectoryService(_fileSystem))
-            {
-                MetadataRefreshMode = MetadataRefreshMode.FullRefresh,
-                ImageRefreshMode = MetadataRefreshMode.FullRefresh,
-                ForceSave = true
-            },
-            RefreshPriority.High);
+        var options = new MetadataRefreshOptions(new DirectoryService(_fileSystem))
+        {
+            MetadataRefreshMode = MetadataRefreshMode.FullRefresh,
+            ImageRefreshMode = MetadataRefreshMode.FullRefresh,
+            ForceSave = true
+        };
+
+        using var timeout = CancellationTokenSource.CreateLinkedTokenSource(HttpContext.RequestAborted);
+        timeout.CancelAfter(RefreshOnDemandTimeout);
+
+        try
+        {
+            await item.RefreshMetadata(options, timeout.Token).ConfigureAwait(false);
+        }
+        catch (OperationCanceledException) when (!HttpContext.RequestAborted.IsCancellationRequested)
+        {
+            _providerManager.QueueRefresh(item.Id, options, RefreshPriority.High);
+        }
    }

    /// <summary>
@@ -458,6 +458,7 @@ public class DynamicHlsHelper
                    {
                        case VideoRangeType.HLG:
                        case VideoRangeType.DOVIWithHLG:
+                        case VideoRangeType.DOVIInvalid when string.Equals(state.VideoStream.ColorTransfer, "arib-std-b67", StringComparison.OrdinalIgnoreCase):
                            builder.Append(",VIDEO-RANGE=HLG");
                            break;
                        default:
@@ -156,7 +156,6 @@ public static class RequestHelpers
        QueryResult<(BaseItem Item, ItemCounts ItemCounts)> result,
        DtoOptions dtoOptions,
        IDtoService dtoService,
-        bool includeItemTypes,
        User? user)
    {
        var dtos = result.Items.Select(i =>
@@ -164,7 +163,7 @@ public static class RequestHelpers
            var (baseItem, counts) = i;
            var dto = dtoService.GetItemByNameDto(baseItem, dtoOptions, null, user);

-            if (includeItemTypes)
+            if (counts is not null)
            {
                dto.ChildCount = counts.ItemCount;
                dto.ProgramCount = counts.ProgramCount;
@@ -175,6 +174,7 @@ public static class RequestHelpers
                dto.AlbumCount = counts.AlbumCount;
                dto.SongCount = counts.SongCount;
                dto.ArtistCount = counts.ArtistCount;
+                dto.MusicVideoCount = counts.MusicVideoCount;
            }

            return dto;
@@ -61,8 +61,9 @@ public enum VideoRangeType
    DOVIWithELHDR10Plus,

    /// <summary>
-    /// Dolby Vision with invalid configuration. e.g. Profile 8 compat id 6.
-    /// When using this range, the server would assume the video is still HDR10 after removing the Dolby Vision metadata.
+    /// Dolby Vision with invalid configuration, e.g. Profile 8 compat id 6 or inconsistent base-layer color metadata.
+    /// The base layer is classified as HDR only when its transfer characteristics signal PQ or HLG.
+    /// Otherwise, it is classified as SDR.
    /// </summary>
    DOVIInvalid,

@@ -121,20 +121,22 @@ public sealed partial class BaseItemRepository
    {
        using var context = _dbProvider.CreateDbContext();

-        var query = context.ItemValuesMap
-            .AsNoTracking()
-            .Where(e => itemValueTypes.Any(w => w == e.ItemValue.Type));
+        var maps = context.ItemValuesMap.AsNoTracking();
        if (withItemTypes.Count > 0)
        {
-            query = query.Where(e => withItemTypes.Contains(e.Item.Type));
+            maps = maps.Where(e => withItemTypes.Contains(e.Item.Type));
        }

        if (excludeItemTypes.Count > 0)
        {
-            query = query.Where(e => !excludeItemTypes.Contains(e.Item.Type));
+            maps = maps.Where(e => !excludeItemTypes.Contains(e.Item.Type));
        }

-        return query.Select(e => e.ItemValue)
+        return context.ItemValues
+            .AsNoTracking()
+            .WhereOneOrMany(itemValueTypes, e => e.Type)
+            .Where(e => maps.Any(m => m.ItemValueId == e.ItemValueId))
+            .Select(e => new { e.CleanValue, e.Value })
            .GroupBy(e => e.CleanValue)
            .Select(g => g.Min(v => v.Value)!)
            .ToArray();
@@ -246,14 +248,20 @@ public sealed partial class BaseItemRepository
        }

        result.StartIndex = filter.StartIndex ?? 0;
-        if (filter.IncludeItemTypes.Length > 0)
+        var page = query.AsEnumerable().Where(e => e is not null).ToList();
+
+        if (filter.DtoOptions.ContainsField(ItemFields.ItemCounts))
        {
-            var countsByCleanName = BuildItemCountsByCleanName(context, filter, itemValueTypes);
+            var pageCleanNames = page
+                .Where(e => !string.IsNullOrEmpty(e.CleanName))
+                .Select(e => e.CleanName!)
+                .Distinct()
+                .ToList();
+
+            var countsByCleanName = BuildItemCountsByCleanName(context, filter, itemValueTypes, pageCleanNames);
            result.Items =
            [
-                .. query
-                    .AsEnumerable()
-                    .Where(e => e is not null)
+                .. page
                    .Select(e =>
                    {
                        var item = DeserializeBaseItem(e, filter.SkipDeserialization);
@@ -268,9 +276,7 @@ public sealed partial class BaseItemRepository
        {
            result.Items =
            [
-                .. query
-                    .AsEnumerable()
-                    .Where(e => e != null)
+                .. page
                    .Select(e => DeserializeBaseItem(e, filter.SkipDeserialization))
                    .Where(item => item != null)
                    .Select(item => (item!, (ItemCounts?)null))
@@ -281,14 +287,22 @@ public sealed partial class BaseItemRepository
    }

    private Dictionary<string, ItemCounts> BuildItemCountsByCleanName(
-        Database.Implementations.JellyfinDbContext context,
+        JellyfinDbContext context,
        InternalItemsQuery filter,
-        IReadOnlyList<ItemValueType> itemValueTypes)
+        IReadOnlyList<ItemValueType> itemValueTypes,
+        IReadOnlyList<string> cleanNames)
    {
-        var typeSubQuery = new InternalItemsQuery(filter.User)
+        var countsByCleanName = new Dictionary<string, ItemCounts>();
+        if (cleanNames.Count == 0)
+        {
+            return countsByCleanName;
+        }
+
+        // The counts describe everything the value is attached to, not only the types the list was
+        // filtered down to.
+        var scopeQuery = new InternalItemsQuery(filter.User)
        {
            ExcludeItemTypes = filter.ExcludeItemTypes,
-            IncludeItemTypes = filter.IncludeItemTypes,
            MediaTypes = filter.MediaTypes,
            AncestorIds = filter.AncestorIds,
            ExcludeItemIds = filter.ExcludeItemIds,
@@ -298,71 +312,115 @@ public sealed partial class BaseItemRepository
            IsPlayed = filter.IsPlayed
        };

-        var itemCountQuery = TranslateQuery(context.BaseItems.AsNoTracking().Where(e => e.Id != EF.Constant(PlaceholderId)), context, typeSubQuery)
-            .Where(e => e.ItemValues!.Any(f => itemValueTypes!.Contains(f.ItemValue.Type)));
+        var scopedItems = TranslateQuery(context.BaseItems.AsNoTracking().Where(e => e.Id != EF.Constant(PlaceholderId)), context, scopeQuery);
+        var valueLinks = context.ItemValuesMap
+            .AsNoTracking()
+            .Where(ivm => itemValueTypes.Contains(ivm.ItemValue.Type))
+            .WhereOneOrMany(cleanNames, ivm => ivm.ItemValue.CleanValue);

        var seriesTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Series];
-        var movieTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Movie];
        var episodeTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Episode];
-        var musicAlbumTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.MusicAlbum];
-        var musicArtistTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.MusicArtist];
-        var audioTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Audio];
-        var trailerTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Trailer];
-        var itemIds = itemCountQuery.Select(e => e.Id);

        // Rewrite query to avoid SelectMany on navigation properties (which requires SQL APPLY, not supported on SQLite)
        // Instead, start from ItemValueMaps and join with BaseItems.
-        var rawCounts = context.ItemValuesMap
-            .Where(ivm => itemValueTypes.Contains(ivm.ItemValue.Type))
-            .Where(ivm => itemIds.Contains(ivm.ItemId))
+        var rawCounts = valueLinks
            .Join(
-                context.BaseItems,
+                scopedItems,
                ivm => ivm.ItemId,
                e => e.Id,
-                (ivm, e) => new { CleanName = ivm.ItemValue.CleanValue, e.Type })
-            .GroupBy(x => new { x.CleanName, x.Type })
-            .Select(g => new { g.Key.CleanName, g.Key.Type, Count = g.Count() })
-            .AsEnumerable();
+                (ivm, e) => new { CleanName = ivm.ItemValue.CleanValue, e.Type, e.SeriesId, e.Id })
+            .GroupBy(x => new { x.CleanName, x.Type, x.SeriesId })
+            .Select(g => new { g.Key.CleanName, g.Key.Type, g.Key.SeriesId, Count = g.Select(x => x.Id).Distinct().Count() })
+            .ToList();
+
+        // Only studios and genres pass down from a series to its episodes; an artist credit does not.
+        var inheritsToEpisodes = itemValueTypes.Contains(ItemValueType.Studios) || itemValueTypes.Contains(ItemValueType.Genre);
+        var episodeCounts = inheritsToEpisodes
+            ? BuildEpisodeCountsByCleanName(
+                scopedItems,
+                valueLinks,
+                rawCounts
+                    .Where(x => x.Type == episodeTypeName)
+                    .Select(x => (x.CleanName, x.SeriesId, x.Count))
+                    .ToList(),
+                seriesTypeName,
+                episodeTypeName)
+            : rawCounts
+                .Where(x => x.Type == episodeTypeName)
+                .GroupBy(x => x.CleanName)
+                .ToDictionary(g => g.Key, g => g.Sum(x => x.Count));

-        var countsByCleanName = new Dictionary<string, ItemCounts>();
        foreach (var group in rawCounts.GroupBy(x => x.CleanName))
        {
-            var counts = new ItemCounts();
-            foreach (var row in group)
-            {
-                if (row.Type == seriesTypeName)
-                {
-                    counts.SeriesCount += row.Count;
-                }
-                else if (row.Type == episodeTypeName)
-                {
-                    counts.EpisodeCount += row.Count;
-                }
-                else if (row.Type == movieTypeName)
-                {
-                    counts.MovieCount += row.Count;
-                }
-                else if (row.Type == musicAlbumTypeName)
-                {
-                    counts.AlbumCount += row.Count;
-                }
-                else if (row.Type == musicArtistTypeName)
-                {
-                    counts.ArtistCount += row.Count;
-                }
-                else if (row.Type == audioTypeName)
-                {
-                    counts.SongCount += row.Count;
-                }
-                else if (row.Type == trailerTypeName)
-                {
-                    counts.TrailerCount += row.Count;
-                }
-            }
+            var counts = ItemCountBuilder.Build(_itemTypeLookup, group.Select(row => (row.Type, row.Count)));

+            // Episodes are counted separately: the value is usually only written on the series.
+            ItemCountBuilder.SetEpisodeCount(counts, episodeCounts.GetValueOrDefault(group.Key));
            countsByCleanName[group.Key] = counts;
        }

+        // A value carried by nothing but the episodes below a tagged series has no row of its own.
+        foreach (var (cleanName, episodeCount) in episodeCounts)
+        {
+            if (!countsByCleanName.ContainsKey(cleanName))
+            {
+                var counts = new ItemCounts();
+                ItemCountBuilder.SetEpisodeCount(counts, episodeCount);
+                countsByCleanName[cleanName] = counts;
+            }
+        }
+
        return countsByCleanName;
    }
+
+    private static Dictionary<string, int> BuildEpisodeCountsByCleanName(
+        IQueryable<BaseItemEntity> scopedItems,
+        IQueryable<ItemValueMap> valueLinks,
+        IReadOnlyList<(string CleanName, Guid? SeriesId, int Count)> taggedEpisodes,
+        string seriesTypeName,
+        string episodeTypeName)
+    {
+        // Resolved in steps rather than as one union: each of these drives off an index, while the
+        // single-statement form leaves SQLite free to scan every episode in the library instead.
+        var taggedSeries = valueLinks
+            .Join(
+                scopedItems.Where(e => e.Type == seriesTypeName),
+                ivm => ivm.ItemId,
+                e => e.Id,
+                (ivm, e) => new { CleanName = ivm.ItemValue.CleanValue, SeriesId = e.Id })
+            .ToList();
+
+        var seriesIds = taggedSeries.Select(x => x.SeriesId).Distinct().ToArray();
+        var episodesPerSeries = seriesIds.Length == 0
+            ? []
+            : scopedItems
+                .Where(e => e.Type == episodeTypeName && e.SeriesId != null)
+                .WhereOneOrMany(seriesIds, e => e.SeriesId!.Value)
+                .GroupBy(e => e.SeriesId!.Value)
+                .Select(g => new { SeriesId = g.Key, Count = g.Count() })
+                .ToDictionary(x => x.SeriesId, x => x.Count);
+
+        var episodeCounts = new Dictionary<string, int>();
+        var seriesByCleanName = new Dictionary<string, HashSet<Guid>>();
+        foreach (var group in taggedSeries.GroupBy(x => x.CleanName))
+        {
+            var series = group.Select(x => x.SeriesId).ToHashSet();
+            seriesByCleanName[group.Key] = series;
+            episodeCounts[group.Key] = series.Sum(id => episodesPerSeries.GetValueOrDefault(id));
+        }
+
+        foreach (var (cleanName, seriesId, count) in taggedEpisodes)
+        {
+            if (seriesId is not null
+                && seriesByCleanName.TryGetValue(cleanName, out var series)
+                && series.Contains(seriesId.Value))
+            {
+                continue;
+            }
+
+            episodeCounts[cleanName] = episodeCounts.GetValueOrDefault(cleanName) + count;
+        }
+
+        return episodeCounts;
+    }
 }
@@ -12,6 +12,7 @@ using Jellyfin.Database.Implementations;
 using Jellyfin.Database.Implementations.Entities;
 using Jellyfin.Database.Implementations.Enums;
 using Jellyfin.Extensions;
+using Jellyfin.Server.Implementations.Extensions;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Model.Entities;
 using MediaBrowser.Model.Querying;
@@ -323,10 +324,21 @@ public sealed partial class BaseItemRepository
            orderedQuery = query.OrderBy(relevanceExpression);
        }

+        // Folders carry no played flag of their own, so these two keys go through the same predicate
+        // the isPlayed filter uses rather than through the stored-column lookup in OrderMapper.
+        Expression<Func<BaseItemEntity, object?>> MapOrderByField(ItemSortBy sortBy) => sortBy switch
+        {
+            ItemSortBy.IsPlayed when filter.User is not null
+                => AsOrderKey(BuildIsPlayedFilter(context, filter.User)),
+            ItemSortBy.IsUnplayed when filter.User is not null
+                => AsOrderKey(BuildIsPlayedFilter(context, filter.User).Not()),
+            _ => OrderMapper.MapOrderByField(sortBy, filter, context)
+        };
+
        if (orderBy.Length > 0)
        {
            var firstOrdering = orderBy[0];
-            var expression = OrderMapper.MapOrderByField(firstOrdering.OrderBy, filter, context);
+            var expression = MapOrderByField(firstOrdering.OrderBy);

            if (orderedQuery is null)
            {
@@ -350,7 +362,7 @@ public sealed partial class BaseItemRepository

            foreach (var item in orderBy.Skip(1))
            {
-                expression = OrderMapper.MapOrderByField(item.OrderBy, filter, context);
+                expression = MapOrderByField(item.OrderBy);
                orderedQuery = item.SortOrder == SortOrder.Ascending
                    ? orderedQuery.ThenBy(expression)
                    : orderedQuery.ThenByDescending(expression);
@@ -666,6 +678,9 @@ public sealed partial class BaseItemRepository
        return ApplyAccessFiltering(context, leafItems, new InternalItemsQuery(user) { IncludeOwnedItems = includeOwnedItems });
    }

+    private static Expression<Func<BaseItemEntity, object?>> AsOrderKey(Expression<Func<BaseItemEntity, bool>> predicate)
+        => Expression.Lambda<Func<BaseItemEntity, object?>>(Expression.Convert(predicate.Body, typeof(object)), predicate.Parameters);
+
    /// <inheritdoc />
    public Expression<Func<BaseItemEntity, bool>> BuildHasDescendantFilter(JellyfinDbContext context, IQueryable<BaseItemEntity> descendants)
    {
@@ -110,7 +110,7 @@ public sealed partial class BaseItemRepository
        PrepareFilterQuery(filter);

        // Early exit if collection type is not supported
-        if (collectionType is not CollectionType.movies and not CollectionType.tvshows and not CollectionType.music)
+        if (collectionType is not CollectionType.movies and not CollectionType.tvshows and not CollectionType.music and not CollectionType.unknown)
        {
            return [];
        }
@@ -121,30 +121,27 @@ public sealed partial class BaseItemRepository
        var baseQuery = PrepareItemQuery(context, filter);
        baseQuery = TranslateQuery(baseQuery, context, filter);

-        if (collectionType == CollectionType.tvshows)
+        if (collectionType is CollectionType.tvshows)
        {
            return GetLatestTvShowItems(context, baseQuery, filter, limit);
        }

        if (collectionType is CollectionType.movies)
        {
-            // Pick, per PresentationUniqueKey, the newest item; return the newest `limit` of those.
-            // Build up until limit by streaming through results and deduplicating on the fly.
-            var orderedIds = baseQuery
-                .Where(e => e.PresentationUniqueKey != null)
-                .OrderByDescending(e => e.DateCreated)
-                .ThenByDescending(e => e.Id)
-                .Select(e => new { e.Id, e.PresentationUniqueKey });
+            return GetLatestMovieItems(context, baseQuery, filter, limit);
+        }

-            // DistinctBy and Take are lazy, so enumeration stops as soon as limit distinct keys are read.
-            var firstIds = orderedIds
-                .AsEnumerable()
-                .DistinctBy(row => row.PresentationUniqueKey)
-                .Select(row => row.Id)
+        if (collectionType is CollectionType.unknown)
+        {
+            var moviesQuery = baseQuery.Where(e => e.SeriesName == null);
+            var latestMovies = GetLatestMovieItems(context, moviesQuery, filter, limit);
+            var latestShows = GetLatestTvShowItems(context, baseQuery, filter, limit);
+
+            return latestMovies.Concat(latestShows)
+                .OrderByDescending(dto => dto.DateCreated)
+                .ThenByDescending(dto => dto.Id)
                .Take(limit ?? int.MaxValue)
                .ToList();
-
-            return LoadLatestByIds(context, firstIds, filter);
        }

        var musicAlbumTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.MusicAlbum]!;
@@ -225,6 +222,39 @@ public sealed partial class BaseItemRepository
            .ToArray()!;
    }

+    /// <summary>
+    /// Gets the latest movies, deduplicated so each movie only appears once.
+    /// </summary>
+    /// <param name="context">The database context.</param>
+    /// <param name="baseQuery">The query to pull movies from, with filters already applied.</param>
+    /// <param name="filter">The original query filter, used when loading the final items.</param>
+    /// <param name="limit">How many items to return.</param>
+    /// <returns>The latest movies, newest first.</returns>
+    private IReadOnlyList<BaseItemDto> GetLatestMovieItems(
+        JellyfinDbContext context,
+        IQueryable<BaseItemEntity> baseQuery,
+        InternalItemsQuery filter,
+        int? limit)
+    {
+        // Pick, per PresentationUniqueKey, the newest item; return the newest `limit` of those.
+        // Build up until limit by streaming through results and deduplicating on the fly.
+        var orderedIds = baseQuery
+            .Where(e => e.PresentationUniqueKey != null)
+            .OrderByDescending(e => e.DateCreated)
+            .ThenByDescending(e => e.Id)
+            .Select(e => new { e.Id, e.PresentationUniqueKey });
+
+        // DistinctBy and Take are lazy, so enumeration stops as soon as limit distinct keys are read.
+        var firstIds = orderedIds
+            .AsEnumerable()
+            .DistinctBy(row => row.PresentationUniqueKey)
+            .Select(row => row.Id)
+            .Take(limit ?? int.MaxValue)
+            .ToList();
+
+        return LoadLatestByIds(context, firstIds, filter);
+    }
+
    /// <summary>
    /// Gets the latest TV show items with smart Season/Series container selection.
    /// </summary>
@@ -596,18 +626,26 @@ public sealed partial class BaseItemRepository
            .ToArray();

        var tags = context.ItemValuesMap
-            .Where(ivm => ivm.ItemValue.Type == ItemValueType.Tags)
-            .Where(ivm => matchingItemIds.Contains(ivm.ItemId))
-            .Select(ivm => ivm.ItemValue)
+            .Join(
+                context.ItemValues,
+                ivm => ivm.ItemValueId,
+                iv => iv.ItemValueId,
+                (ivm, iv) => new { ivm.ItemId, iv.Type, iv.CleanValue, iv.Value })
+            .Where(iv => iv.Type == ItemValueType.Tags)
+            .Where(iv => matchingItemIds.Contains(iv.ItemId))
            .GroupBy(iv => iv.CleanValue)
            .Select(g => g.Min(iv => iv.Value))
            .OrderBy(t => t)
            .ToArray();

        var genres = context.ItemValuesMap
-            .Where(ivm => ivm.ItemValue.Type == ItemValueType.Genre)
-            .Where(ivm => matchingItemIds.Contains(ivm.ItemId))
-            .Select(ivm => ivm.ItemValue)
+            .Join(
+                context.ItemValues,
+                ivm => ivm.ItemValueId,
+                iv => iv.ItemValueId,
+                (ivm, iv) => new { ivm.ItemId, iv.Type, iv.CleanValue, iv.Value })
+            .Where(iv => iv.Type == ItemValueType.Genre)
+            .Where(iv => matchingItemIds.Contains(iv.ItemId))
            .GroupBy(iv => iv.CleanValue)
            .Select(g => g.Min(iv => iv.Value))
            .OrderBy(g => g)
@@ -35,6 +35,49 @@ public sealed partial class BaseItemRepository
    // instance across several lambdas, and this filter is combined into a tree more than once.
    private static Expression<Func<BaseItemEntity, bool>> IsFolderFilter => e => e.IsFolder;

+    // Shared by the isPlayed filter and the IsPlayed/IsUnplayed ordering so the two cannot disagree.
+    private Expression<Func<BaseItemEntity, bool>> BuildIsPlayedFilter(JellyfinDbContext context, User user)
+    {
+        // Folders (Series, Seasons, BoxSets, albums, ...) carry no played state of their own and count
+        // as played once no descendant is left unplayed.
+        var unplayedLeafItems = GetAccessFilteredLeafItemsQuery(context, user)
+            .Where(BuildLeafIsPlayedFilter(context, user.Id).Not());
+
+        return IsFolderFilter.And(BuildHasDescendantFilter(context, unplayedLeafItems).Not())
+            .Or(IsFolderFilter.Not().And(BuildLeafIsPlayedFilter(context, user.Id)));
+    }
+
+    private static Expression<Func<BaseItemEntity, bool>> BuildLeafIsPlayedFilter(JellyfinDbContext context, Guid userId)
+    {
+        var playedItemIds = context.UserData
+            .Where(ud => ud.UserId == userId && ud.Played)
+            .Select(ud => ud.ItemId);
+
+        // The primaries of every version group holding a played row, whichever version carries it.
+        var playedGroupIds = context.BaseItems
+            .Where(v => v.PrimaryVersionId != null
+                && context.UserData.Any(ud => ud.UserId == userId
+                    && ud.Played
+                    && (ud.ItemId == v.Id || ud.ItemId == v.PrimaryVersionId)))
+            .Select(v => v.PrimaryVersionId!.Value);
+
+        return e => playedItemIds.Contains(e.Id)
+            || playedGroupIds.Contains(e.Id)
+            || (e.PrimaryVersionId != null && playedGroupIds.Contains(e.PrimaryVersionId.Value));
+    }
+
+    // "und" is the language filters' stand-in for a track that declares no language at all.
+    private static string NormalizeLanguage(string language)
+        => string.Equals(language, "und", StringComparison.OrdinalIgnoreCase) ? "und" : language;
+
+    // The primary versions whose alternate version satisfies a dimension bound. Anchored on
+    // PrimaryVersionId so the filtered index carries it rather than a scan of every item.
+    private static IQueryable<Guid> VersionsMatchingDimension(JellyfinDbContext context, Expression<Func<BaseItemEntity, bool>> bound)
+        => context.BaseItems
+            .Where(v => v.PrimaryVersionId != null)
+            .Where(bound)
+            .Select(v => v.PrimaryVersionId!.Value);
+
    /// <inheritdoc />
    public IQueryable<BaseItemEntity> TranslateQuery(
        IQueryable<BaseItemEntity> baseQuery,
@@ -70,47 +113,86 @@ public sealed partial class BaseItemRepository
                include4K = true;
            }

-            // Non-folders: check own resolution directly (no subquery).
-            // Folders (Series, BoxSets): EXISTS check on descendants/linked children.
-            // Using navigation properties (a.Item, lc.Child) produces efficient
-            // EXISTS + JOIN instead of nested IN (SELECT ...) subqueries.
+            // A 4K remux of an SD primary is a version of the same item, so the bucket a caller filters
+            // on is the best any of the item's versions offers, not just the primary file's. Three sets,
+            // because a bucket is as much about what the version group does not have as what it does, and
+            // because an unprobed primary can still be placed by a version that does carry dimensions.
+            // The filtered PrimaryVersionId index keeps all three to the few items that have versions.
+            var versionsSd = VersionsMatchingDimension(context, v => v.Width > 0 && v.Width < HDWidth);
+            var versionsHd = VersionsMatchingDimension(context, v => v.Width >= HDWidth);
+            var versions4K = VersionsMatchingDimension(context, v => v.Width >= UHDWidth || v.Height >= UHDHeight);
+
+            // Only the SD test needs the Width > 0 guard against a row with no dimensions: such a row
+            // cannot reach the HD or 4K bound anyway, and EF lowers the HD bucket's negated "not itself
+            // 4K" guard to CASE WHEN ... THEN 0 ELSE 1, which already reads unknown as not 4K rather
+            // than propagating a null. Folders (Series, BoxSets) answer on their descendants, bucketed
+            // exactly as a top-level item is so that the two cannot disagree; the navigation properties
+            // (a.Item, lc.Child) give EXISTS + JOIN rather than nested IN (SELECT ...).
            baseQuery = baseQuery.Where(e =>
-                (!e.IsFolder && e.Width > 0
-                    && ((includeSD && e.Width < HDWidth)
-                        || (includeHD && e.Width >= HDWidth && !(e.Width >= UHDWidth || e.Height >= UHDHeight))
-                        || (include4K && (e.Width >= UHDWidth || e.Height >= UHDHeight))))
+                (!e.IsFolder
+                    && ((includeSD
+                            && ((e.Width > 0 && e.Width < HDWidth) || versionsSd.Contains(e.Id))
+                            && !versionsHd.Contains(e.Id)
+                            && !versions4K.Contains(e.Id))
+                        || (includeHD
+                            && (e.Width >= HDWidth || versionsHd.Contains(e.Id))
+                            && !(e.Width >= UHDWidth || e.Height >= UHDHeight)
+                            && !versions4K.Contains(e.Id))
+                        || (include4K
+                            && (e.Width >= UHDWidth || e.Height >= UHDHeight || versions4K.Contains(e.Id)))))
                || (e.IsFolder
                    && (e.Children!.Any(a =>
-                            a.Item.Width > 0
-                            && ((includeSD && a.Item.Width < HDWidth)
-                                || (includeHD && a.Item.Width >= HDWidth && !(a.Item.Width >= UHDWidth || a.Item.Height >= UHDHeight))
-                                || (include4K && (a.Item.Width >= UHDWidth || a.Item.Height >= UHDHeight))))
+                            (includeSD
+                                && ((a.Item.Width > 0 && a.Item.Width < HDWidth) || versionsSd.Contains(a.ItemId))
+                                && !versionsHd.Contains(a.ItemId)
+                                && !versions4K.Contains(a.ItemId))
+                            || (includeHD
+                                && (a.Item.Width >= HDWidth || versionsHd.Contains(a.ItemId))
+                                && !(a.Item.Width >= UHDWidth || a.Item.Height >= UHDHeight)
+                                && !versions4K.Contains(a.ItemId))
+                            || (include4K
+                                && (a.Item.Width >= UHDWidth || a.Item.Height >= UHDHeight || versions4K.Contains(a.ItemId))))
                        || context.LinkedChildren.Any(lc =>
                            lc.ParentId == e.Id
-                            && lc.Child!.Width > 0
-                            && ((includeSD && lc.Child.Width < HDWidth)
-                                || (includeHD && lc.Child.Width >= HDWidth && !(lc.Child.Width >= UHDWidth || lc.Child.Height >= UHDHeight))
-                                || (include4K && (lc.Child.Width >= UHDWidth || lc.Child.Height >= UHDHeight)))))));
+                            && ((includeSD
+                                    && ((lc.Child!.Width > 0 && lc.Child!.Width < HDWidth) || versionsSd.Contains(lc.ChildId))
+                                    && !versionsHd.Contains(lc.ChildId)
+                                    && !versions4K.Contains(lc.ChildId))
+                                || (includeHD
+                                    && (lc.Child!.Width >= HDWidth || versionsHd.Contains(lc.ChildId))
+                                    && !(lc.Child!.Width >= UHDWidth || lc.Child!.Height >= UHDHeight)
+                                    && !versions4K.Contains(lc.ChildId))
+                                || (include4K
+                                    && (lc.Child!.Width >= UHDWidth || lc.Child!.Height >= UHDHeight || versions4K.Contains(lc.ChildId))))))));
        }

+        // Same reasoning as the resolution filter: a dimension bound is met if any version meets it.
        if (minWidth.HasValue)
        {
-            baseQuery = baseQuery.Where(e => e.Width >= minWidth);
+            var versionsWideEnough = VersionsMatchingDimension(context, v => v.Width >= minWidth);
+            baseQuery = baseQuery.Where(e => e.Width >= minWidth || versionsWideEnough.Contains(e.Id));
        }

        if (filter.MinHeight.HasValue)
        {
-            baseQuery = baseQuery.Where(e => e.Height >= filter.MinHeight);
+            var minHeight = filter.MinHeight;
+            var versionsTallEnough = VersionsMatchingDimension(context, v => v.Height >= minHeight);
+            baseQuery = baseQuery.Where(e => e.Height >= minHeight || versionsTallEnough.Contains(e.Id));
        }

+        // An upper bound inverts that: it is met only if no version breaches it, since the item's
+        // resolution is the best its version group offers.
        if (maxWidth.HasValue)
        {
-            baseQuery = baseQuery.Where(e => e.Width <= maxWidth);
+            var versionsTooWide = VersionsMatchingDimension(context, v => v.Width > maxWidth);
+            baseQuery = baseQuery.Where(e => e.Width <= maxWidth && !versionsTooWide.Contains(e.Id));
        }

        if (filter.MaxHeight.HasValue)
        {
-            baseQuery = baseQuery.Where(e => e.Height <= filter.MaxHeight);
+            var maxHeight = filter.MaxHeight;
+            var versionsTooTall = VersionsMatchingDimension(context, v => v.Height > maxHeight);
+            baseQuery = baseQuery.Where(e => e.Height <= maxHeight && !versionsTooTall.Contains(e.Id));
        }

        if (filter.IsLocked.HasValue)
@@ -472,22 +554,7 @@ public sealed partial class BaseItemRepository

        if (filter.IsPlayed.HasValue)
        {
-            var userId = filter.User!.Id;
-
-            // Leaf items carry their own played state.
-            var playedItemIds = context.UserData
-                .Where(ud => ud.UserId == userId && ud.Played)
-                .Select(ud => ud.ItemId);
-
-            // Folders (Series, Seasons, BoxSets, albums, ...) have none and count as played once no
-            // descendant is left unplayed, matching what the DTO reports for them. This has to key off
-            // the item itself rather than off the requested item types: tag and collection listings mix
-            // folders and leaf items in a single query.
-            var unplayedLeafItems = GetAccessFilteredLeafItemsQuery(context, filter.User!)
-                .Where(e => !e.UserData!.Any(ud => ud.UserId == userId && ud.Played));
-
-            var isPlayedFilter = IsFolderFilter.And(BuildHasDescendantFilter(context, unplayedLeafItems).Not())
-                .Or(IsFolderFilter.Not().And(e => playedItemIds.Contains(e.Id)));
+            var isPlayedFilter = BuildIsPlayedFilter(context, filter.User!);

            baseQuery = baseQuery.Where(filter.IsPlayed.Value ? isPlayedFilter : isPlayedFilter.Not());
        }
@@ -761,104 +828,144 @@ public sealed partial class BaseItemRepository

        if (!string.IsNullOrWhiteSpace(filter.HasNoAudioTrackWithLanguage))
        {
-            var lang = filter.HasNoAudioTrackWithLanguage;
-            var foldersWithAudio = DescendantQueryHelper.GetFolderIdsMatching(context, new HasMediaStreamType(MediaStreamTypeEntity.Audio, lang));
+            var lang = NormalizeLanguage(filter.HasNoAudioTrackWithLanguage);
+            var undetermined = string.Equals(lang, "und", StringComparison.Ordinal);
+            var criteria = new HasMediaStreamType(MediaStreamTypeEntity.Audio, lang);
+            // A track only an alternate version carries still belongs to the item a caller sees, so the
+            // item's own streams alone do not decide this. Same for every stream filter below.
+            var versionsWithAudio = DescendantQueryHelper.GetPrimaryVersionIdsMatching(context, criteria);
+            var foldersWithAudio = DescendantQueryHelper.GetFolderIdsMatching(context, criteria);

            baseQuery = baseQuery
                .Where(e =>
-                    (!e.IsFolder && !e.MediaStreams!.Any(ms => ms.StreamType == MediaStreamTypeEntity.Audio && ms.Language == lang))
+                    (!e.IsFolder
+                        && !e.MediaStreams!.Any(ms => ms.StreamType == MediaStreamTypeEntity.Audio
+                            && (ms.Language == lang || (undetermined && string.IsNullOrEmpty(ms.Language))))
+                        && !versionsWithAudio.Contains(e.Id))
                    || (e.IsFolder && !foldersWithAudio.Contains(e.Id)));
        }

        if (!string.IsNullOrWhiteSpace(filter.HasNoInternalSubtitleTrackWithLanguage))
        {
-            var lang = filter.HasNoInternalSubtitleTrackWithLanguage;
-            var foldersWithSubtitles = DescendantQueryHelper.GetFolderIdsMatching(context, new HasMediaStreamType(MediaStreamTypeEntity.Subtitle, lang, IsExternal: false));
+            var lang = NormalizeLanguage(filter.HasNoInternalSubtitleTrackWithLanguage);
+            var undetermined = string.Equals(lang, "und", StringComparison.Ordinal);
+            var criteria = new HasMediaStreamType(MediaStreamTypeEntity.Subtitle, lang, IsExternal: false);
+            var versionsWithSubtitles = DescendantQueryHelper.GetPrimaryVersionIdsMatching(context, criteria);
+            var foldersWithSubtitles = DescendantQueryHelper.GetFolderIdsMatching(context, criteria);

            baseQuery = baseQuery
                .Where(e =>
-                    (!e.IsFolder && !e.MediaStreams!.Any(ms => ms.StreamType == MediaStreamTypeEntity.Subtitle && !ms.IsExternal && ms.Language == lang))
+                    (!e.IsFolder
+                        && !e.MediaStreams!.Any(ms => ms.StreamType == MediaStreamTypeEntity.Subtitle && !ms.IsExternal
+                            && (ms.Language == lang || (undetermined && string.IsNullOrEmpty(ms.Language))))
+                        && !versionsWithSubtitles.Contains(e.Id))
                    || (e.IsFolder && !foldersWithSubtitles.Contains(e.Id)));
        }

        if (!string.IsNullOrWhiteSpace(filter.HasNoExternalSubtitleTrackWithLanguage))
        {
-            var lang = filter.HasNoExternalSubtitleTrackWithLanguage;
-            var foldersWithSubtitles = DescendantQueryHelper.GetFolderIdsMatching(context, new HasMediaStreamType(MediaStreamTypeEntity.Subtitle, lang, IsExternal: true));
+            var lang = NormalizeLanguage(filter.HasNoExternalSubtitleTrackWithLanguage);
+            var undetermined = string.Equals(lang, "und", StringComparison.Ordinal);
+            var criteria = new HasMediaStreamType(MediaStreamTypeEntity.Subtitle, lang, IsExternal: true);
+            var versionsWithSubtitles = DescendantQueryHelper.GetPrimaryVersionIdsMatching(context, criteria);
+            var foldersWithSubtitles = DescendantQueryHelper.GetFolderIdsMatching(context, criteria);

            baseQuery = baseQuery
                .Where(e =>
-                    (!e.IsFolder && !e.MediaStreams!.Any(ms => ms.StreamType == MediaStreamTypeEntity.Subtitle && ms.IsExternal && ms.Language == lang))
+                    (!e.IsFolder
+                        && !e.MediaStreams!.Any(ms => ms.StreamType == MediaStreamTypeEntity.Subtitle && ms.IsExternal
+                            && (ms.Language == lang || (undetermined && string.IsNullOrEmpty(ms.Language))))
+                        && !versionsWithSubtitles.Contains(e.Id))
                    || (e.IsFolder && !foldersWithSubtitles.Contains(e.Id)));
        }

        if (!string.IsNullOrWhiteSpace(filter.HasNoSubtitleTrackWithLanguage))
        {
-            var lang = filter.HasNoSubtitleTrackWithLanguage;
-            var foldersWithSubtitles = DescendantQueryHelper.GetFolderIdsMatching(context, new HasMediaStreamType(MediaStreamTypeEntity.Subtitle, lang));
+            var lang = NormalizeLanguage(filter.HasNoSubtitleTrackWithLanguage);
+            var undetermined = string.Equals(lang, "und", StringComparison.Ordinal);
+            var criteria = new HasMediaStreamType(MediaStreamTypeEntity.Subtitle, lang);
+            var versionsWithSubtitles = DescendantQueryHelper.GetPrimaryVersionIdsMatching(context, criteria);
+            var foldersWithSubtitles = DescendantQueryHelper.GetFolderIdsMatching(context, criteria);

            baseQuery = baseQuery
                .Where(e =>
-                    (!e.IsFolder && !e.MediaStreams!.Any(ms => ms.StreamType == MediaStreamTypeEntity.Subtitle && ms.Language == lang))
+                    (!e.IsFolder
+                        && !e.MediaStreams!.Any(ms => ms.StreamType == MediaStreamTypeEntity.Subtitle
+                            && (ms.Language == lang || (undetermined && string.IsNullOrEmpty(ms.Language))))
+                        && !versionsWithSubtitles.Contains(e.Id))
                    || (e.IsFolder && !foldersWithSubtitles.Contains(e.Id)));
        }

        if (filter.HasSubtitles.HasValue)
        {
            var hasSubtitles = filter.HasSubtitles.Value;
-            var foldersWithSubtitles = DescendantQueryHelper.GetFolderIdsMatching(context, new HasSubtitles());
+            var criteria = new HasSubtitles();
+            var versionsWithSubtitles = DescendantQueryHelper.GetPrimaryVersionIdsMatching(context, criteria);
+            var foldersWithSubtitles = DescendantQueryHelper.GetFolderIdsMatching(context, criteria);
            if (hasSubtitles)
            {
                baseQuery = baseQuery
                    .Where(e =>
-                        (!e.IsFolder && e.MediaStreams!.Any(f => f.StreamType == MediaStreamTypeEntity.Subtitle))
+                        (!e.IsFolder && (e.MediaStreams!.Any(f => f.StreamType == MediaStreamTypeEntity.Subtitle)
+                            || versionsWithSubtitles.Contains(e.Id)))
                        || (e.IsFolder && foldersWithSubtitles.Contains(e.Id)));
            }
            else
            {
                baseQuery = baseQuery
                    .Where(e =>
-                        (!e.IsFolder && !e.MediaStreams!.Any(f => f.StreamType == MediaStreamTypeEntity.Subtitle))
+                        (!e.IsFolder && !e.MediaStreams!.Any(f => f.StreamType == MediaStreamTypeEntity.Subtitle)
+                            && !versionsWithSubtitles.Contains(e.Id))
                        || (e.IsFolder && !foldersWithSubtitles.Contains(e.Id)));
            }
        }

        if (filter.SubtitleLanguages.Count > 0)
        {
-            var foldersWithSubtitles = DescendantQueryHelper.GetFolderIdsMatching(context, new HasMediaStreamType(MediaStreamTypeEntity.Subtitle, filter.SubtitleLanguages));
+            var criteria = new HasMediaStreamType(MediaStreamTypeEntity.Subtitle, filter.SubtitleLanguages);
+            var versionsWithSubtitles = DescendantQueryHelper.GetPrimaryVersionIdsMatching(context, criteria);
+            var foldersWithSubtitles = DescendantQueryHelper.GetFolderIdsMatching(context, criteria);
            baseQuery = baseQuery
                .Where(e =>
-                    (!e.IsFolder && e.MediaStreams!.Any(f => f.StreamType == MediaStreamTypeEntity.Subtitle
-                     && (filter.SubtitleLanguages.Contains(f.Language) || (filter.SubtitleLanguages.Contains("und") && string.IsNullOrEmpty(f.Language)))))
+                    (!e.IsFolder && (e.MediaStreams!.Any(f => f.StreamType == MediaStreamTypeEntity.Subtitle
+                        && (filter.SubtitleLanguages.Contains(f.Language) || (filter.SubtitleLanguages.Contains("und") && string.IsNullOrEmpty(f.Language))))
+                        || versionsWithSubtitles.Contains(e.Id)))
                    || (e.IsFolder && foldersWithSubtitles.Contains(e.Id)));
        }

        if (filter.AudioLanguages.Count > 0)
        {
-            var foldersWithAudio = DescendantQueryHelper.GetFolderIdsMatching(context, new HasMediaStreamType(MediaStreamTypeEntity.Audio, filter.AudioLanguages));
+            var criteria = new HasMediaStreamType(MediaStreamTypeEntity.Audio, filter.AudioLanguages);
+            var versionsWithAudio = DescendantQueryHelper.GetPrimaryVersionIdsMatching(context, criteria);
+            var foldersWithAudio = DescendantQueryHelper.GetFolderIdsMatching(context, criteria);
            baseQuery = baseQuery
                .Where(e =>
-                    (!e.IsFolder && e.MediaStreams!.Any(f => f.StreamType == MediaStreamTypeEntity.Audio
-                     && (filter.AudioLanguages.Contains(f.Language) || (filter.AudioLanguages.Contains("und") && string.IsNullOrEmpty(f.Language)))))
+                    (!e.IsFolder && (e.MediaStreams!.Any(f => f.StreamType == MediaStreamTypeEntity.Audio
+                        && (filter.AudioLanguages.Contains(f.Language) || (filter.AudioLanguages.Contains("und") && string.IsNullOrEmpty(f.Language))))
+                        || versionsWithAudio.Contains(e.Id)))
                    || (e.IsFolder && foldersWithAudio.Contains(e.Id)));
        }

        if (filter.HasChapterImages.HasValue)
        {
            var hasChapterImages = filter.HasChapterImages.Value;
-            var foldersWithChapterImages = DescendantQueryHelper.GetFolderIdsMatching(context, new HasChapterImages());
+            var criteria = new HasChapterImages();
+            var versionsWithChapterImages = DescendantQueryHelper.GetPrimaryVersionIdsMatching(context, criteria);
+            var foldersWithChapterImages = DescendantQueryHelper.GetFolderIdsMatching(context, criteria);
            if (hasChapterImages)
            {
                baseQuery = baseQuery
                    .Where(e =>
-                        (!e.IsFolder && e.Chapters!.Any(f => f.ImagePath != null))
+                        (!e.IsFolder && (e.Chapters!.Any(f => f.ImagePath != null)
+                            || versionsWithChapterImages.Contains(e.Id)))
                        || (e.IsFolder && foldersWithChapterImages.Contains(e.Id)));
            }
            else
            {
                baseQuery = baseQuery
                    .Where(e =>
-                        (!e.IsFolder && !e.Chapters!.Any(f => f.ImagePath != null))
+                        (!e.IsFolder && !e.Chapters!.Any(f => f.ImagePath != null)
+                            && !versionsWithChapterImages.Contains(e.Id))
                        || (e.IsFolder && !foldersWithChapterImages.Contains(e.Id)));
            }
        }
@@ -994,6 +1101,12 @@ public sealed partial class BaseItemRepository
            baseQuery = baseQuery.Where(e => e.Parents!.AsQueryable().Any(ancestorFilter));
        }

+        if (filter.DescendantOfId.HasValue)
+        {
+            var descendantIds = DescendantQueryHelper.GetAllDescendantIds(context, filter.DescendantOfId.Value);
+            baseQuery = baseQuery.Where(e => descendantIds.Contains(e.Id));
+        }
+
        if (filter.LinkedChildAncestorIds.Length > 0)
        {
            // Keep folder-like items (BoxSets, Playlists) whose linked children descend from any of the requested ancestor ids.
@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using Jellyfin.Data.Enums;
+using MediaBrowser.Controller.Persistence;
+using MediaBrowser.Model.Dto;
+
+namespace Jellyfin.Server.Implementations.Item;
+
+/// <summary>
+/// Turns per-type counts into an <see cref="ItemCounts"/>.
+/// </summary>
+internal static class ItemCountBuilder
+{
+    /// <summary>
+    /// Builds the counts of one by-name item.
+    /// </summary>
+    /// <param name="itemTypeLookup">The item type lookup.</param>
+    /// <param name="counts">The counted items, by type name. A type may repeat.</param>
+    /// <returns>The counts.</returns>
+    public static ItemCounts Build(IItemTypeLookup itemTypeLookup, IEnumerable<(string Type, int Count)> counts)
+    {
+        ArgumentNullException.ThrowIfNull(itemTypeLookup);
+        ArgumentNullException.ThrowIfNull(counts);
+
+        var lookup = itemTypeLookup.BaseItemKindNames;
+        var result = new ItemCounts();
+
+        foreach (var (type, count) in counts)
+        {
+            // Accumulated rather than assigned: a caller may group by something finer than the
+            // type and hand the same type over more than once.
+            if (string.Equals(type, lookup[BaseItemKind.MusicAlbum], StringComparison.Ordinal))
+            {
+                result.AlbumCount += count;
+            }
+            else if (string.Equals(type, lookup[BaseItemKind.MusicArtist], StringComparison.Ordinal))
+            {
+                result.ArtistCount += count;
+            }
+            else if (string.Equals(type, lookup[BaseItemKind.Episode], StringComparison.Ordinal))
+            {
+                result.EpisodeCount += count;
+            }
+            else if (string.Equals(type, lookup[BaseItemKind.Movie], StringComparison.Ordinal))
+            {
+                result.MovieCount += count;
+            }
+            else if (string.Equals(type, lookup[BaseItemKind.MusicVideo], StringComparison.Ordinal))
+            {
+                result.MusicVideoCount += count;
+            }
+            else if (string.Equals(type, lookup[BaseItemKind.LiveTvProgram], StringComparison.Ordinal))
+            {
+                result.ProgramCount += count;
+            }
+            else if (string.Equals(type, lookup[BaseItemKind.Series], StringComparison.Ordinal))
+            {
+                result.SeriesCount += count;
+            }
+            else if (string.Equals(type, lookup[BaseItemKind.Audio], StringComparison.Ordinal))
+            {
+                result.SongCount += count;
+            }
+            else if (string.Equals(type, lookup[BaseItemKind.Trailer], StringComparison.Ordinal))
+            {
+                result.TrailerCount += count;
+            }
+            else if (string.Equals(type, lookup[BaseItemKind.BoxSet], StringComparison.Ordinal))
+            {
+                result.BoxSetCount += count;
+            }
+            else if (string.Equals(type, lookup[BaseItemKind.Book], StringComparison.Ordinal))
+            {
+                result.BookCount += count;
+            }
+        }
+
+        result.ItemCount = result.TotalItemCount();
+
+        return result;
+    }
+
+    /// <summary>
+    /// Replaces the episode count, which both by-name paths decide separately from the other
+    /// types because a genre or studio is usually written on the series rather than its episodes.
+    /// </summary>
+    /// <param name="counts">The counts to update.</param>
+    /// <param name="episodeCount">The episode count.</param>
+    public static void SetEpisodeCount(ItemCounts counts, int episodeCount)
+    {
+        ArgumentNullException.ThrowIfNull(counts);
+
+        counts.EpisodeCount = episodeCount;
+        counts.ItemCount = counts.TotalItemCount();
+    }
+}
@@ -7,6 +7,7 @@ using System.Linq;
 using Jellyfin.Data.Enums;
 using Jellyfin.Database.Implementations;
 using Jellyfin.Database.Implementations.Entities;
+using Jellyfin.Database.Implementations.Enums;
 using Jellyfin.Extensions;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Persistence;
@@ -125,154 +126,304 @@ public class ItemCountService : IItemCountService
    /// <inheritdoc />
    public ItemCounts GetItemCountsForNameItem(BaseItemKind kind, Guid id, BaseItemKind[] relatedItemKinds, InternalItemsQuery accessFilter)
    {
-        using var context = _dbProvider.CreateDbContext();
+        return GetItemCountsForNameItems(kind, [id], relatedItemKinds, accessFilter)[id];
+    }

-        var item = context.BaseItems.AsNoTracking()
-            .Where(e => e.Id == id)
-            .Select(e => new { e.Name, e.CleanName })
-            .FirstOrDefault();
-
-        if (item is null)
+    private static ItemValueType[] GetItemValueTypes(BaseItemKind kind)
+        => kind switch
        {
-            return new ItemCounts();
+            BaseItemKind.MusicArtist => [ItemValueType.Artist, ItemValueType.AlbumArtist],
+            BaseItemKind.Genre or BaseItemKind.MusicGenre => [ItemValueType.Genre],
+            BaseItemKind.Studio => [ItemValueType.Studios],
+            _ => []
+        };
+
+    /// <inheritdoc />
+    public Dictionary<Guid, ItemCounts> GetItemCountsForNameItems(BaseItemKind kind, IReadOnlyList<Guid> ids, BaseItemKind[] relatedItemKinds, InternalItemsQuery accessFilter)
+    {
+        ArgumentNullException.ThrowIfNull(ids);
+        ArgumentNullException.ThrowIfNull(relatedItemKinds);
+        ArgumentNullException.ThrowIfNull(accessFilter);
+
+        var result = new Dictionary<Guid, ItemCounts>();
+        if (ids.Count == 0)
+        {
+            return result;
        }

-        IQueryable<BaseItemEntity> baseQuery;
-        switch (kind)
-        {
-            case BaseItemKind.Person:
-                baseQuery = ItemsById(context, context.PeopleBaseItemMap
-                    .AsNoTracking()
-                    .Where(m => m.People.Name == item.Name)
-                    .Select(m => m.ItemId));
-                break;
-            case BaseItemKind.MusicArtist:
-                baseQuery = ItemsById(context, context.ItemValuesMap
-                    .AsNoTracking()
-                    .Where(ivm => ivm.ItemValue.CleanValue == item.CleanName
-                        && (ivm.ItemValue.Type == ItemValueType.Artist || ivm.ItemValue.Type == ItemValueType.AlbumArtist))
-                    .Select(ivm => ivm.ItemId));
-                break;
-            case BaseItemKind.Genre:
-            case BaseItemKind.MusicGenre:
-                baseQuery = ItemsById(context, context.ItemValuesMap
-                    .AsNoTracking()
-                    .Where(ivm => ivm.ItemValue.CleanValue == item.CleanName
-                        && ivm.ItemValue.Type == ItemValueType.Genre)
-                    .Select(ivm => ivm.ItemId));
-                break;
-            case BaseItemKind.Studio:
-                baseQuery = ItemsById(context, context.ItemValuesMap
-                    .AsNoTracking()
-                    .Where(ivm => ivm.ItemValue.CleanValue == item.CleanName
-                        && ivm.ItemValue.Type == ItemValueType.Studios)
-                    .Select(ivm => ivm.ItemId));
-                break;
-            case BaseItemKind.Year:
-                if (int.TryParse(item.Name, NumberStyles.Integer, CultureInfo.InvariantCulture, out var year))
-                {
-                    baseQuery = context.BaseItems
-                        .AsNoTracking()
-                        .Where(e => e.ProductionYear == year);
-                }
-                else
-                {
-                    return new ItemCounts();
-                }
+        using var context = _dbProvider.CreateDbContext();

-                break;
-            default:
-                return new ItemCounts();
+        var idsArray = ids as Guid[] ?? ids.ToArray();
+        var nameItems = context.BaseItems.AsNoTracking()
+            .WhereOneOrMany(idsArray, e => e.Id)
+            .Select(e => new NameItem(e.Id, e.Name, e.CleanName))
+            .ToArray();
+
+        foreach (var id in ids)
+        {
+            result[id] = new ItemCounts();
+        }
+
+        if (nameItems.Length == 0)
+        {
+            return result;
        }

        var typeNames = relatedItemKinds.Select(k => _itemTypeLookup.BaseItemKindNames[k]).ToArray();
-        baseQuery = baseQuery.Where(e => typeNames.Contains(e.Type));
+        var related = _queryHelpers.ApplyAccessFiltering(
+            context,
+            context.BaseItems.AsNoTracking().Where(e => typeNames.Contains(e.Type)),
+            accessFilter);

-        baseQuery = _queryHelpers.ApplyAccessFiltering(context, baseQuery, accessFilter);
-
-        var counts = baseQuery
-            .GroupBy(x => x.Type)
-            .Select(x => new { x.Key, Count = x.Count() })
-            .ToArray();
-
-        var lookup = _itemTypeLookup.BaseItemKindNames;
-        var result = new ItemCounts();
-        var totalCount = 0;
-
-        foreach (var count in counts)
+        var valueTypes = GetItemValueTypes(kind);
+        if (valueTypes.Length > 0)
        {
-            totalCount += count.Count;
-
-            if (string.Equals(count.Key, lookup[BaseItemKind.MusicAlbum], StringComparison.Ordinal))
-            {
-                result.AlbumCount = count.Count;
-            }
-            else if (string.Equals(count.Key, lookup[BaseItemKind.MusicArtist], StringComparison.Ordinal))
-            {
-                result.ArtistCount = count.Count;
-            }
-            else if (string.Equals(count.Key, lookup[BaseItemKind.Episode], StringComparison.Ordinal))
-            {
-                result.EpisodeCount = count.Count;
-            }
-            else if (string.Equals(count.Key, lookup[BaseItemKind.Movie], StringComparison.Ordinal))
-            {
-                result.MovieCount = count.Count;
-            }
-            else if (string.Equals(count.Key, lookup[BaseItemKind.MusicVideo], StringComparison.Ordinal))
-            {
-                result.MusicVideoCount = count.Count;
-            }
-            else if (string.Equals(count.Key, lookup[BaseItemKind.LiveTvProgram], StringComparison.Ordinal))
-            {
-                result.ProgramCount = count.Count;
-            }
-            else if (string.Equals(count.Key, lookup[BaseItemKind.Series], StringComparison.Ordinal))
-            {
-                result.SeriesCount = count.Count;
-            }
-            else if (string.Equals(count.Key, lookup[BaseItemKind.Audio], StringComparison.Ordinal))
-            {
-                result.SongCount = count.Count;
-            }
-            else if (string.Equals(count.Key, lookup[BaseItemKind.Trailer], StringComparison.Ordinal))
-            {
-                result.TrailerCount = count.Count;
-            }
-            else if (string.Equals(count.Key, lookup[BaseItemKind.BoxSet], StringComparison.Ordinal))
-            {
-                result.BoxSetCount = count.Count;
-            }
-            else if (string.Equals(count.Key, lookup[BaseItemKind.Book], StringComparison.Ordinal))
-            {
-                result.BookCount = count.Count;
-            }
+            CountByItemValue(context, related, kind, relatedItemKinds, valueTypes, nameItems, result);
+        }
+        else if (kind == BaseItemKind.Person)
+        {
+            CountByPersonName(context, related, nameItems, result);
+        }
+        else if (kind == BaseItemKind.Year)
+        {
+            CountByProductionYear(related, nameItems, result);
        }
-
-        result.ItemCount = totalCount;

        return result;
    }

-    private static IQueryable<BaseItemEntity> ItemsById(JellyfinDbContext context, IQueryable<Guid> itemIds)
-        => context.BaseItems.AsNoTracking().Where(e => itemIds.Contains(e.Id));
+    private void CountByItemValue(
+        JellyfinDbContext context,
+        IQueryable<BaseItemEntity> related,
+        BaseItemKind kind,
+        BaseItemKind[] relatedItemKinds,
+        ItemValueType[] valueTypes,
+        NameItem[] nameItems,
+        Dictionary<Guid, ItemCounts> result)
+    {
+        var cleanNames = nameItems
+            .Select(n => n.CleanName)
+            .OfType<string>()
+            .Distinct(StringComparer.Ordinal)
+            .ToArray();
+
+        if (cleanNames.Length == 0)
+        {
+            return;
+        }
+
+        var grouped = context.ItemValuesMap.AsNoTracking()
+            .Where(ivm => valueTypes.Contains(ivm.ItemValue.Type))
+            .WhereOneOrMany(cleanNames, ivm => ivm.ItemValue.CleanValue)
+            .Join(related, ivm => ivm.ItemId, e => e.Id, (ivm, e) => new { ivm.ItemValue.CleanValue, e.Type, e.Id })
+            .GroupBy(x => new { x.CleanValue, x.Type })
+            .Select(g => new { g.Key.CleanValue, g.Key.Type, Count = g.Select(x => x.Id).Distinct().Count() })
+            .ToArray();
+
+        var byCleanName = grouped
+            .GroupBy(g => g.CleanValue, StringComparer.Ordinal)
+            .ToDictionary(g => g.Key, g => g.Select(x => (x.Type, x.Count)).ToArray(), StringComparer.Ordinal);
+
+        var seriesTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Series];
+        var episodeRollUp = RollsUpEpisodes(kind, relatedItemKinds)
+                && Array.Exists(grouped, g => string.Equals(g.Type, seriesTypeName, StringComparison.Ordinal))
+            ? CountEpisodesOfTaggedSeriesByCleanName(context, related, valueTypes, cleanNames)
+            : null;
+
+        foreach (var nameItem in nameItems)
+        {
+            if (nameItem.CleanName is null || !byCleanName.TryGetValue(nameItem.CleanName, out var counts))
+            {
+                continue;
+            }
+
+            var itemCounts = ItemCountBuilder.Build(_itemTypeLookup, counts);
+
+            if (episodeRollUp is not null)
+            {
+                var rollUp = episodeRollUp.GetValueOrDefault(nameItem.CleanName);
+
+                // Episodes of a tagged series count towards it even when untagged themselves, and
+                // a tagged episode of a tagged series must not be counted a second time.
+                var directEpisodeCount = itemCounts.EpisodeCount - rollUp.TaggedEpisodesOfTaggedSeries;
+                ItemCountBuilder.SetEpisodeCount(itemCounts, rollUp.EpisodesOfTaggedSeries + directEpisodeCount);
+            }
+
+            result[nameItem.Id] = itemCounts;
+        }
+    }
+
+    private void CountByPersonName(
+        JellyfinDbContext context,
+        IQueryable<BaseItemEntity> related,
+        NameItem[] nameItems,
+        Dictionary<Guid, ItemCounts> result)
+    {
+        var names = nameItems
+            .Select(n => n.Name)
+            .OfType<string>()
+            .Distinct(StringComparer.Ordinal)
+            .ToArray();
+
+        if (names.Length == 0)
+        {
+            return;
+        }
+
+        var grouped = context.PeopleBaseItemMap.AsNoTracking()
+            .WhereOneOrMany(names, m => m.People.Name)
+            .Join(related, m => m.ItemId, e => e.Id, (m, e) => new { m.People.Name, e.Type, e.Id })
+            .GroupBy(x => new { x.Name, x.Type })
+            // A person can be credited on one item more than once, in different roles.
+            .Select(g => new { g.Key.Name, g.Key.Type, Count = g.Select(x => x.Id).Distinct().Count() })
+            .ToArray();
+
+        ApplyGroupedCounts(nameItems, n => n.Name, grouped.Select(g => (g.Name, g.Type, g.Count)), result);
+    }
+
+    private void CountByProductionYear(
+        IQueryable<BaseItemEntity> related,
+        NameItem[] nameItems,
+        Dictionary<Guid, ItemCounts> result)
+    {
+        var years = new List<int>();
+        foreach (var nameItem in nameItems)
+        {
+            if (int.TryParse(nameItem.Name, NumberStyles.Integer, CultureInfo.InvariantCulture, out var year)
+                && !years.Contains(year))
+            {
+                years.Add(year);
+            }
+        }
+
+        if (years.Count == 0)
+        {
+            return;
+        }
+
+        // No join, so no row can be reached twice and a plain count is the distinct count.
+        var grouped = related
+            .Where(e => e.ProductionYear != null)
+            .WhereOneOrMany(years, e => e.ProductionYear!.Value)
+            .GroupBy(e => new { Year = e.ProductionYear!.Value, e.Type })
+            .Select(g => new { g.Key.Year, g.Key.Type, Count = g.Count() })
+            .ToArray();
+
+        var byYear = grouped
+            .GroupBy(g => g.Year)
+            .ToDictionary(g => g.Key, g => g.Select(x => (x.Type, x.Count)).ToArray());
+
+        foreach (var nameItem in nameItems)
+        {
+            if (int.TryParse(nameItem.Name, NumberStyles.Integer, CultureInfo.InvariantCulture, out var year)
+                && byYear.TryGetValue(year, out var counts))
+            {
+                result[nameItem.Id] = ItemCountBuilder.Build(_itemTypeLookup, counts);
+            }
+        }
+    }
+
+    private void ApplyGroupedCounts(
+        NameItem[] nameItems,
+        Func<NameItem, string?> keySelector,
+        IEnumerable<(string Key, string Type, int Count)> grouped,
+        Dictionary<Guid, ItemCounts> result)
+    {
+        var byKey = grouped
+            .GroupBy(g => g.Key, StringComparer.Ordinal)
+            .ToDictionary(g => g.Key, g => g.Select(x => (x.Type, x.Count)).ToArray(), StringComparer.Ordinal);
+
+        foreach (var nameItem in nameItems)
+        {
+            var key = keySelector(nameItem);
+            if (key is not null && byKey.TryGetValue(key, out var counts))
+            {
+                result[nameItem.Id] = ItemCountBuilder.Build(_itemTypeLookup, counts);
+            }
+        }
+    }
+
+    private static bool RollsUpEpisodes(BaseItemKind kind, BaseItemKind[] relatedItemKinds)
+        => kind is BaseItemKind.Studio or BaseItemKind.Genre or BaseItemKind.MusicGenre
+            && relatedItemKinds.Contains(BaseItemKind.Episode)
+            && relatedItemKinds.Contains(BaseItemKind.Series);
+
+    private Dictionary<string, (int EpisodesOfTaggedSeries, int TaggedEpisodesOfTaggedSeries)> CountEpisodesOfTaggedSeriesByCleanName(
+        JellyfinDbContext context,
+        IQueryable<BaseItemEntity> related,
+        ItemValueType[] valueTypes,
+        string[] cleanNames)
+    {
+        var seriesTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Series];
+        var episodeTypeName = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Episode];
+
+        var taggedValues = context.ItemValuesMap.AsNoTracking()
+            .Where(ivm => valueTypes.Contains(ivm.ItemValue.Type))
+            .WhereOneOrMany(cleanNames, ivm => ivm.ItemValue.CleanValue);
+
+        // The series carrying each clean name. Distinct, because one item can be mapped to the
+        // same clean name once per value type.
+        var taggedSeries = taggedValues
+            .Join(
+                related.Where(e => e.Type == seriesTypeName),
+                ivm => ivm.ItemId,
+                e => e.Id,
+                (ivm, e) => new { ivm.ItemValue.CleanValue, SeriesId = e.Id })
+            .Distinct();
+
+        var episodes = related.Where(e => e.Type == episodeTypeName && e.SeriesId != null);
+
+        var episodesOfTaggedSeries = taggedSeries
+            .Join(episodes, s => s.SeriesId, e => e.SeriesId!.Value, (s, e) => new { s.CleanValue, e.Id })
+            .GroupBy(x => x.CleanValue)
+            .Select(g => new { CleanValue = g.Key, Count = g.Select(x => x.Id).Distinct().Count() })
+            .ToArray();
+
+        // Episodes that carry the clean name themselves *and* belong to a series carrying it. The
+        // roll-up already counts those, so they have to come off the directly tagged ones.
+        var taggedEpisodesOfTaggedSeries = taggedValues
+            .Join(episodes, ivm => ivm.ItemId, e => e.Id, (ivm, e) => new { ivm.ItemValue.CleanValue, e.Id, e.SeriesId })
+            .Join(
+                taggedSeries,
+                e => new { e.CleanValue, SeriesId = e.SeriesId!.Value },
+                s => new { s.CleanValue, s.SeriesId },
+                (e, s) => new { e.CleanValue, e.Id })
+            .GroupBy(x => x.CleanValue)
+            .Select(g => new { CleanValue = g.Key, Count = g.Select(x => x.Id).Distinct().Count() })
+            .ToArray();
+
+        var taggedLookup = taggedEpisodesOfTaggedSeries
+            .ToDictionary(x => x.CleanValue, x => x.Count, StringComparer.Ordinal);
+
+        // Every clean name in taggedLookup came from an episode of a tagged series, so it always
+        // has a row in episodesOfTaggedSeries too - no second merge pass is needed.
+        var result = new Dictionary<string, (int EpisodesOfTaggedSeries, int TaggedEpisodesOfTaggedSeries)>(StringComparer.Ordinal);
+        foreach (var entry in episodesOfTaggedSeries)
+        {
+            result[entry.CleanValue] = (entry.Count, taggedLookup.GetValueOrDefault(entry.CleanValue));
+        }
+
+        return result;
+    }

    /// <inheritdoc/>
    public int GetPlayedCount(InternalItemsQuery filter, Guid ancestorId)
    {
+        ArgumentNullException.ThrowIfNull(filter);
        ArgumentNullException.ThrowIfNull(filter.User);
        using var dbContext = _dbProvider.CreateDbContext();

-        var baseQuery = _queryHelpers.BuildAccessFilteredDescendantsQuery(dbContext, filter, ancestorId);
+        var baseQuery = BuildGroupedDescendantsQuery(dbContext, filter, ancestorId);
        return baseQuery.Count(b => b.UserData!.Any(u => u.UserId == filter.User.Id && u.Played));
    }

    /// <inheritdoc/>
    public int GetTotalCount(InternalItemsQuery filter, Guid ancestorId)
    {
+        ArgumentNullException.ThrowIfNull(filter);
        using var dbContext = _dbProvider.CreateDbContext();

-        var baseQuery = _queryHelpers.BuildAccessFilteredDescendantsQuery(dbContext, filter, ancestorId);
+        var baseQuery = BuildGroupedDescendantsQuery(dbContext, filter, ancestorId);
        return baseQuery.Count();
    }

@@ -283,10 +434,23 @@ public class ItemCountService : IItemCountService
        ArgumentNullException.ThrowIfNull(filter.User);
        using var dbContext = _dbProvider.CreateDbContext();

-        var baseQuery = _queryHelpers.BuildAccessFilteredDescendantsQuery(dbContext, filter, ancestorId);
+        var baseQuery = BuildGroupedDescendantsQuery(dbContext, filter, ancestorId);
        return GetPlayedAndTotalCountFromQuery(baseQuery, filter.User.Id);
    }

+    private IQueryable<BaseItemEntity> BuildGroupedDescendantsQuery(JellyfinDbContext dbContext, InternalItemsQuery filter, Guid ancestorId)
+    {
+        var ancestorIds = GetPresentationKeyGroups(dbContext, [ancestorId])[ancestorId];
+        var descendantIds = DescendantQueryHelper.GetAllDescendantIdsBatch(dbContext, ancestorIds).ToArray();
+
+        var baseQuery = dbContext.BaseItems
+            .AsNoTracking()
+            .WhereOneOrMany(descendantIds, b => b.Id)
+            .Where(DescendantQueryHelper.IsCountableLeaf);
+
+        return _queryHelpers.ApplyAccessFiltering(dbContext, baseQuery, filter);
+    }
+
    /// <inheritdoc/>
    public (int Played, int Total) GetPlayedAndTotalCountFromLinkedChildren(InternalItemsQuery filter, Guid parentId)
    {
@@ -294,9 +458,9 @@ public class ItemCountService : IItemCountService
        ArgumentNullException.ThrowIfNull(filter.User);
        using var dbContext = _dbProvider.CreateDbContext();

-        var allDescendantIds = DescendantQueryHelper.GetAllDescendantIds(dbContext, parentId);
+        var allDescendantIds = DescendantQueryHelper.GetAllDescendantIdsBatch(dbContext, [parentId]).ToArray();
        var baseQuery = dbContext.BaseItems
-            .Where(b => allDescendantIds.Contains(b.Id))
+            .WhereOneOrMany(allDescendantIds, b => b.Id)
            .Where(DescendantQueryHelper.IsCountableLeaf);
        baseQuery = _queryHelpers.ApplyAccessFiltering(dbContext, baseQuery, filter);

@@ -304,7 +468,7 @@ public class ItemCountService : IItemCountService
    }

    /// <inheritdoc/>
-    public Dictionary<Guid, int> GetChildCountBatch(IReadOnlyList<Guid> parentIds, Guid? userId)
+    public Dictionary<Guid, int> GetChildCountBatch(IReadOnlyList<Guid> parentIds, User? user)
    {
        ArgumentNullException.ThrowIfNull(parentIds);

@@ -317,22 +481,44 @@ public class ItemCountService : IItemCountService

        var parentIdsArray = parentIds.ToArray();

+        var includeVirtual = user is null || user.DisplayMissingEpisodes;
+
        var hierarchicalCounts = dbContext.BaseItems
-            .Where(b => b.ParentId.HasValue && parentIdsArray.Contains(b.ParentId.Value))
+            .Where(b => b.ParentId.HasValue && !b.SeasonId.HasValue && (includeVirtual || !b.IsVirtualItem))
+            .WhereOneOrMany(parentIdsArray, b => b.ParentId!.Value)
            .GroupBy(b => b.ParentId!.Value)
            .Select(g => new { ParentId = g.Key, Count = g.Count() })
            .ToDictionary(x => x.ParentId, x => x.Count);

+        // An episode is a child of its season even when it is not stored under one: with a flat
+        // structure ParentId points at the series, so counting by ParentId alone leaves the season
+        // empty and counts its episodes towards the series instead.
+        var seasonCounts = dbContext.BaseItems
+            .Where(b => b.SeasonId.HasValue && (includeVirtual || !b.IsVirtualItem))
+            .WhereOneOrMany(parentIdsArray, b => b.SeasonId!.Value)
+            .GroupBy(b => b.SeasonId!.Value)
+            .Select(g => new { SeasonId = g.Key, Count = g.Count() })
+            .ToDictionary(x => x.SeasonId, x => x.Count);
+
        var linkedCounts = dbContext.LinkedChildren
-            .Where(lc => parentIdsArray.Contains(lc.ParentId))
+            .WhereOneOrMany(parentIdsArray, lc => lc.ParentId)
            .GroupBy(lc => lc.ParentId)
            .Select(g => new { ParentId = g.Key, Count = g.Count() })
            .ToDictionary(x => x.ParentId, x => x.Count);

+        var mergedChildCounts = GetMergedChildCounts(dbContext, parentIdsArray, includeVirtual);
+
        var result = new Dictionary<Guid, int>();
        foreach (var parentId in parentIds)
        {
-            var hierarchicalCount = hierarchicalCounts.GetValueOrDefault(parentId, 0);
+            if (mergedChildCounts.TryGetValue(parentId, out var mergedCount))
+            {
+                result[parentId] = mergedCount;
+                continue;
+            }
+
+            var hierarchicalCount = hierarchicalCounts.GetValueOrDefault(parentId, 0)
+                + seasonCounts.GetValueOrDefault(parentId, 0);
            var linkedCount = linkedCounts.GetValueOrDefault(parentId, 0);

            result[parentId] = linkedCount > 0 ? linkedCount : hierarchicalCount;
@@ -341,6 +527,56 @@ public class ItemCountService : IItemCountService
        return result;
    }

+    private static Dictionary<Guid, int> GetMergedChildCounts(JellyfinDbContext dbContext, IReadOnlyList<Guid> parentIds, bool includeVirtual)
+    {
+        var mergedGroups = GetPresentationKeyGroups(dbContext, parentIds)
+            .Where(group => group.Value.Count > 1)
+            .ToArray();
+
+        if (mergedGroups.Length == 0)
+        {
+            return [];
+        }
+
+        // Only merged folders.
+        var memberIds = mergedGroups.SelectMany(group => group.Value).Distinct().ToArray();
+        var children = dbContext.BaseItems
+            .AsNoTracking()
+            .Where(b => b.ParentId.HasValue && !b.SeasonId.HasValue && (includeVirtual || !b.IsVirtualItem))
+            .WhereOneOrMany(memberIds, b => b.ParentId!.Value)
+            .Select(b => new { ParentId = b.ParentId!.Value, b.Id, b.PresentationUniqueKey })
+            .ToArray()
+            .Concat(dbContext.BaseItems
+                .AsNoTracking()
+                .Where(b => b.SeasonId.HasValue && (includeVirtual || !b.IsVirtualItem))
+                .WhereOneOrMany(memberIds, b => b.SeasonId!.Value)
+                .Select(b => new { ParentId = b.SeasonId!.Value, b.Id, b.PresentationUniqueKey })
+                .ToArray())
+            .GroupBy(b => b.ParentId)
+            .ToDictionary(
+                g => g.Key,
+                g => g.Select(b => string.IsNullOrEmpty(b.PresentationUniqueKey)
+                    ? b.Id.ToString("N", CultureInfo.InvariantCulture)
+                    : b.PresentationUniqueKey).ToArray());
+
+        var result = new Dictionary<Guid, int>();
+        foreach (var (parentId, members) in mergedGroups)
+        {
+            var childKeys = new HashSet<string>(StringComparer.Ordinal);
+            foreach (var member in members)
+            {
+                if (children.TryGetValue(member, out var keys))
+                {
+                    childKeys.UnionWith(keys);
+                }
+            }
+
+            result[parentId] = childKeys.Count;
+        }
+
+        return result;
+    }
+
    /// <inheritdoc/>
    public Dictionary<Guid, (int Played, int Total)> GetPlayedAndTotalCountBatch(IReadOnlyList<Guid> folderIds, User user)
    {
@@ -353,10 +589,13 @@ public class ItemCountService : IItemCountService
        }

        using var dbContext = _dbProvider.CreateDbContext();
-        var folderIdsArray = folderIds.ToArray();
        var filter = new InternalItemsQuery(user);
        var userId = user.Id;

+        // Merged series and seasons are stored as one row per folder-item sharing a presentation key.
+        var groups = GetPresentationKeyGroups(dbContext, folderIds);
+        var folderIdsArray = groups.Values.SelectMany(members => members).Distinct().ToArray();
+
        var leafItems = dbContext.BaseItems
            .Where(DescendantQueryHelper.IsCountableLeaf);
        leafItems = _queryHelpers.ApplyAccessFiltering(dbContext, leafItems, filter);
@@ -398,7 +637,7 @@ public class ItemCountService : IItemCountService
                b => b.Id,
                (x, b) => new { FolderId = x.ParentId, b.Id, b.Played });

-        var results = ancestorLeaves
+        var countsByFolder = ancestorLeaves
            .Union(linkedLeaves)
            .Union(linkedFolderLeaves)
            .GroupBy(x => x.FolderId)
@@ -410,9 +649,73 @@ public class ItemCountService : IItemCountService
            })
            .ToDictionary(x => x.FolderId, x => (x.Played, x.Total));

+        var results = new Dictionary<Guid, (int Played, int Total)>();
+        foreach (var (folderId, members) in groups)
+        {
+            var played = 0;
+            var total = 0;
+
+            // Members of a group are distinct folders, so their leaves cannot overlap.
+            foreach (var member in members)
+            {
+                if (countsByFolder.TryGetValue(member, out var counts))
+                {
+                    played += counts.Played;
+                    total += counts.Total;
+                }
+            }
+
+            if (total > 0 || played > 0)
+            {
+                results[folderId] = (played, total);
+            }
+        }
+
        return results;
    }

+    private static Dictionary<Guid, List<Guid>> GetPresentationKeyGroups(JellyfinDbContext dbContext, IReadOnlyList<Guid> folderIds)
+    {
+        var requested = dbContext.BaseItems
+            .AsNoTracking()
+            .WhereOneOrMany(folderIds, e => e.Id)
+            .Select(e => new { e.Id, e.PresentationUniqueKey })
+            .ToArray();
+
+        var keys = requested
+            .Select(e => e.PresentationUniqueKey)
+            .Where(key => !string.IsNullOrEmpty(key))
+            .Distinct(StringComparer.Ordinal)
+            .ToArray();
+
+        // Every item that is not merged carries a key derived from its own id, so in the common case
+        // each group resolves back to the single folder that was asked for.
+        var membersByKey = keys.Length == 0
+            ? []
+            : dbContext.BaseItems
+                .AsNoTracking()
+                .Where(e => e.IsFolder)
+                .WhereOneOrMany(keys, e => e.PresentationUniqueKey!)
+                .Select(e => new { e.Id, Key = e.PresentationUniqueKey! })
+                .ToArray()
+                .GroupBy(e => e.Key, StringComparer.Ordinal)
+                .ToDictionary(g => g.Key, g => g.Select(e => e.Id).ToList(), StringComparer.Ordinal);
+
+        var keyById = requested.ToDictionary(e => e.Id, e => e.PresentationUniqueKey);
+        var groups = new Dictionary<Guid, List<Guid>>();
+        foreach (var folderId in folderIds)
+        {
+            groups[folderId] = keyById.TryGetValue(folderId, out var key)
+                && !string.IsNullOrEmpty(key)
+                && membersByKey.TryGetValue(key, out var members)
+                && members.Count > 0
+                    ? members
+                    : [folderId];
+        }
+
+        return groups;
+    }
+
    private static (int Played, int Total) GetPlayedAndTotalCountFromQuery(IQueryable<BaseItemEntity> query, Guid userId)
    {
        var result = query
@@ -428,4 +731,12 @@ public class ItemCountService : IItemCountService

        return result is null ? (0, 0) : (result.Played, result.Total);
    }
+
+    /// <summary>
+    /// A by-name item, reduced to the three columns the counting keys off.
+    /// </summary>
+    /// <param name="Id">The id of the by-name item.</param>
+    /// <param name="Name">The name of the by-name item.</param>
+    /// <param name="CleanName">The cleaned name of the by-name item.</param>
+    private sealed record NameItem(Guid Id, string? Name, string? CleanName);
 }
@@ -176,14 +176,6 @@ public class ItemPersistenceService : IItemPersistenceService
        var context = await _dbProvider.CreateDbContextAsync(cancellationToken).ConfigureAwait(false);
        await using (context.ConfigureAwait(false))
        {
-            if (!await context.BaseItems
-                .AnyAsync(bi => bi.Id == item.Id, cancellationToken)
-                .ConfigureAwait(false))
-            {
-                _logger.LogWarning("Unable to save ImageInfo for non existing BaseItem");
-                return;
-            }
-
            await context.BaseItemImageInfos
                .Where(e => e.ItemId == item.Id)
                .ExecuteDeleteAsync(cancellationToken)
@@ -193,7 +185,26 @@ public class ItemPersistenceService : IItemPersistenceService
                .AddRangeAsync(images, cancellationToken)
                .ConfigureAwait(false);

-            await context.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
+            try
+            {
+                await context.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
+            }
+            catch (DbUpdateException)
+            {
+                // Checking that the item exists before writing leaves a gap a scan can delete it
+                // through, turning the insert into a foreign key violation that fails the whole
+                // refresh instead of the no-op intended here. Let the insert be the check: it is the
+                // only point at which the answer cannot go stale. Nothing is orphaned by the delete
+                // above, because deleting the item cascades to its images anyway.
+                if (await context.BaseItems
+                    .AnyAsync(bi => bi.Id == item.Id, cancellationToken)
+                    .ConfigureAwait(false))
+                {
+                    throw;
+                }
+
+                _logger.LogWarning("Unable to save ImageInfo for non existing BaseItem {ItemId}", item.Id);
+            }
        }
    }

@@ -538,7 +549,7 @@ public class ItemPersistenceService : IItemPersistenceService
                var childIdsToCheck = resolvedChildren.Select(c => c.ChildId).Distinct().ToList();
                var existingChildIds = childIdsToCheck.Count > 0
                    ? context.BaseItems
-                        .Where(e => childIdsToCheck.Contains(e.Id))
+                        .WhereOneOrMany(childIdsToCheck, e => e.Id)
                        .Select(e => e.Id)
                        .ToHashSet()
                    : [];
@@ -7,6 +7,7 @@ using System.Collections.Generic;
 using System.Linq;
 using Jellyfin.Data.Enums;
 using Jellyfin.Database.Implementations;
+using Jellyfin.Extensions;
 using MediaBrowser.Controller.Entities.Audio;
 using MediaBrowser.Controller.Persistence;
 using Microsoft.EntityFrameworkCore;
@@ -83,26 +84,27 @@ public class LinkedChildrenService : ILinkedChildrenService
    {
        using var dbContext = _dbProvider.CreateDbContext();

-        var lowerNames = artistNames.Select(n => n.ToLowerInvariant()).ToArray();
+        var cleanNames = artistNames.Select(n => (Original: n, Clean: n.GetCleanValue())).ToArray();
+        var cleanValues = cleanNames.Select(x => x.Clean).ToArray();
+
        var artists = dbContext.BaseItems
            .AsNoTracking()
            .Where(e => e.Type == _itemTypeLookup.BaseItemKindNames[BaseItemKind.MusicArtist]!)
-            .Where(e => lowerNames.Contains(e.Name!.ToLower()))
+            .Where(e => cleanValues.Contains(e.CleanName))
            .ToArray();

        var lookup = artists
-            .GroupBy(e => e.Name!, StringComparer.OrdinalIgnoreCase)
+            .GroupBy(e => e.CleanName!)
            .ToDictionary(
                g => g.Key,
-                g => g.Select(f => _queryHelpers.DeserializeBaseItem(f)).Where(dto => dto is not null).Cast<MusicArtist>().ToArray(),
-                StringComparer.OrdinalIgnoreCase);
+                g => g.Select(f => _queryHelpers.DeserializeBaseItem(f)).Where(dto => dto is not null).Cast<MusicArtist>().ToArray());

-        var result = new Dictionary<string, MusicArtist[]>(artistNames.Count);
-        foreach (var name in artistNames)
+        var result = new Dictionary<string, MusicArtist[]>(cleanNames.Length);
+        foreach (var (original, clean) in cleanNames)
        {
-            if (lookup.TryGetValue(name, out var artistArray))
+            if (lookup.TryGetValue(clean, out var artistArray))
            {
-                result[name] = artistArray;
+                result[original] = artistArray;
            }
        }

@@ -194,12 +194,44 @@ public class PeopleRepository(IDbContextFactory<JellyfinDbContext> dbProvider, I
            listOrder++;
        }

+        var droppedCredits = existingMaps.Select(e => e.PeopleId).Distinct().ToArray();
        context.PeopleBaseItemMap.RemoveRange(existingMaps);

+        context.SaveChanges();
+
+        // Nothing else ever deletes a credit row, so one left without a single mapping outlives the
+        // credit it stood for: it keeps a person of that name off the dead-person sweep, which only
+        // sees items no credit names, and keeps the name in every by-name list. That is how a credit
+        // a provider dropped, or one a broken provider result invented, becomes impossible to clean up.
+        DeleteCreditsWithoutMapping(context, droppedCredits);
+
        context.SaveChanges();
        transaction.Commit();
    }

+    /// <inheritdoc/>
+    public int DeleteOrphanedCredits()
+    {
+        using var context = _dbProvider.CreateDbContext();
+
+        return DeleteCreditsWithoutMapping(context, null);
+    }
+
+    // A null candidate list sweeps every credit, anything else only the ones just unmapped.
+    private int DeleteCreditsWithoutMapping(JellyfinDbContext context, IReadOnlyList<Guid>? candidates)
+    {
+        if (candidates is not null && candidates.Count == 0)
+        {
+            return 0;
+        }
+
+        var credits = candidates is null
+            ? context.Peoples.AsQueryable()
+            : context.Peoples.WhereOneOrMany(candidates, e => e.Id);
+
+        return credits.Where(e => !context.PeopleBaseItemMap.Any(f => f.PeopleId == e.Id)).ExecuteDelete();
+    }
+
    /// <inheritdoc/>
    public IReadOnlyDictionary<Guid, IReadOnlyList<string>> GetPeopleNamesByItems(IReadOnlyList<Guid> itemIds, IReadOnlyList<string> personTypes)
    {
@@ -351,7 +383,11 @@ public class PeopleRepository(IDbContextFactory<JellyfinDbContext> dbProvider, I

        if (!filter.ItemId.IsEmpty())
        {
-            query = query.Where(e => e.BaseItems!.Any(w => w.ItemId.Equals(filter.ItemId)));
+            var itemId = filter.ItemId;
+            query = query.Where(e => context.PeopleBaseItemMap
+                .Where(m => m.ItemId.Equals(itemId))
+                .Select(m => m.PeopleId)
+                .Contains(e.Id));
        }

        if (filter.ParentId != null)
@@ -361,7 +397,11 @@ public class PeopleRepository(IDbContextFactory<JellyfinDbContext> dbProvider, I

        if (!filter.AppearsInItemId.IsEmpty())
        {
-            query = query.Where(e => e.BaseItems!.Any(w => w.ItemId.Equals(filter.AppearsInItemId)));
+            var appearsInItemId = filter.AppearsInItemId;
+            query = query.Where(e => context.PeopleBaseItemMap
+                .Where(m => m.ItemId.Equals(appearsInItemId))
+                .Select(m => m.PeopleId)
+                .Contains(e.Id));
        }

        var queryPersonTypes = filter.PersonTypes.Where(IsValidPersonType).ToList();
@@ -225,17 +225,8 @@ namespace Jellyfin.Server.Implementations.Users
                        ?? throw new ResourceNotFoundException(nameof(user.Id));

                    dbContext.Entry(dbUser).CurrentValues.SetValues(user);
-                    dbUser.Permissions.Clear();
-                    foreach (var permission in user.Permissions)
-                    {
-                        dbUser.Permissions.Add(new Permission(permission.Kind, permission.Value));
-                    }
-
-                    dbUser.Preferences.Clear();
-                    foreach (var preference in user.Preferences)
-                    {
-                        dbUser.Preferences.Add(new Preference(preference.Kind, preference.Value));
-                    }
+                    SyncPermissions(dbUser, user.Permissions);
+                    SyncPreferences(dbUser, user.Preferences);

                    dbUser.AccessSchedules.Clear();
                    foreach (var accessSchedule in user.AccessSchedules)
@@ -269,6 +260,60 @@ namespace Jellyfin.Server.Implementations.Users
            }
        }

+        private static void SyncPermissions(User dbUser, ICollection<Permission> source)
+        {
+            var incoming = new Dictionary<PermissionKind, bool>();
+            foreach (var permission in source)
+            {
+                incoming[permission.Kind] = permission.Value;
+            }
+
+            foreach (var existing in dbUser.Permissions)
+            {
+                if (incoming.Remove(existing.Kind, out var value))
+                {
+                    // EF only marks the row modified if the value actually differs, so an update that
+                    // touches nothing but the user row - a session activity stamp - writes no children.
+                    existing.Value = value;
+                }
+                else
+                {
+                    dbUser.Permissions.Remove(existing);
+                }
+            }
+
+            foreach (var (kind, value) in incoming)
+            {
+                dbUser.Permissions.Add(new Permission(kind, value));
+            }
+        }
+
+        private static void SyncPreferences(User dbUser, ICollection<Preference> source)
+        {
+            var incoming = new Dictionary<PreferenceKind, string>();
+            foreach (var preference in source)
+            {
+                incoming[preference.Kind] = preference.Value;
+            }
+
+            foreach (var existing in dbUser.Preferences)
+            {
+                if (incoming.Remove(existing.Kind, out var value))
+                {
+                    existing.Value = value;
+                }
+                else
+                {
+                    dbUser.Preferences.Remove(existing);
+                }
+            }
+
+            foreach (var (kind, value) in incoming)
+            {
+                dbUser.Preferences.Add(new Preference(kind, value));
+            }
+        }
+
        internal async Task<User> CreateUserInternalAsync(string name, JellyfinDbContext dbContext)
        {
            // TODO: Remove after user item data is migrated.
@@ -183,7 +183,13 @@ internal class JellyfinMigrationService
        }
    }

-    public async Task MigrateStepAsync(JellyfinMigrationStageTypes stage, IServiceProvider? serviceProvider)
+    /// <summary>
+    /// Runs all pending migrations of the requested stage.
+    /// </summary>
+    /// <param name="stage">The stage to migrate.</param>
+    /// <param name="serviceProvider">The service provider handed to the migrations.</param>
+    /// <returns>A value indicating whether at least one migration has been applied.</returns>
+    public async Task<bool> MigrateStepAsync(JellyfinMigrationStageTypes stage, IServiceProvider serviceProvider)
    {
        var logger = _startupLogger.With(_loggerFactory.CreateLogger<JellyfinMigrationService>()).BeginGroup($"Migrate stage {stage}.");
        ICollection<CodeMigration> migrationStage = (Migrations.FirstOrDefault(e => e.Stage == stage) as ICollection<CodeMigration>) ?? [];
@@ -297,6 +303,8 @@ internal class JellyfinMigrationService

                completedMigrations++;
            }
+
+            return completedMigrations > 0;
        }
    }

@@ -445,10 +453,10 @@ internal class JellyfinMigrationService
    private class InternalCodeMigration : IInternalMigration
    {
        private readonly CodeMigration _codeMigration;
-        private readonly IServiceProvider? _serviceProvider;
+        private readonly IServiceProvider _serviceProvider;
        private JellyfinDbContext _dbContext;

-        public InternalCodeMigration(CodeMigration codeMigration, IServiceProvider? serviceProvider, JellyfinDbContext dbContext)
+        public InternalCodeMigration(CodeMigration codeMigration, IServiceProvider serviceProvider, JellyfinDbContext dbContext)
        {
            _codeMigration = codeMigration;
            _serviceProvider = serviceProvider;
@@ -29,7 +29,7 @@ internal class MigrateLibraryUserData : IAsyncMigrationRoutine
    private readonly IDbContextFactory<JellyfinDbContext> _provider;

    public MigrateLibraryUserData(
-            IStartupLogger<MigrateLibraryDb> startupLogger,
+            IStartupLogger<MigrateLibraryUserData> startupLogger,
            IDbContextFactory<JellyfinDbContext> provider,
            IServerApplicationPaths paths)
    {
@@ -24,7 +24,7 @@ internal class ReseedFolderFlag : IAsyncMigrationRoutine
    private readonly IDbContextFactory<JellyfinDbContext> _provider;

    public ReseedFolderFlag(
-            IStartupLogger<MigrateLibraryDb> startupLogger,
+            IStartupLogger<ReseedFolderFlag> startupLogger,
            IDbContextFactory<JellyfinDbContext> provider,
            IServerApplicationPaths paths)
    {
@@ -22,6 +22,11 @@ namespace Jellyfin.Server.Migrations.Routines;
 [JellyfinMigrationBackup(JellyfinDb = true)]
 internal class MigrateLinkedChildren : IDatabaseMigrationRoutine
 {
+    private const int ParseProgressLogStep = 25_000;
+    private const int FileCheckProgressLogStep = 10_000;
+    private const int ResolveProgressLogStep = 10_000;
+    private const int DeleteProgressLogStep = 25;
+
    private readonly ILogger<MigrateLinkedChildren> _logger;
    private readonly IDbContextFactory<JellyfinDbContext> _dbProvider;
    private readonly ILibraryManager _libraryManager;
@@ -85,7 +90,6 @@ internal class MigrateLinkedChildren : IDatabaseMigrationRoutine
        var droppedChildren = 0;
        var linkedChildrenToAdd = new List<LinkedChildEntity>();
        var processedCount = 0;
-        const int progressLogStep = 1000;
        var totalItems = itemsWithData.Count;

        foreach (var item in itemsWithData)
@@ -95,7 +99,7 @@ internal class MigrateLinkedChildren : IDatabaseMigrationRoutine
                continue;
            }

-            if (processedCount > 0 && processedCount % progressLogStep == 0)
+            if (processedCount > 0 && processedCount % ParseProgressLogStep == 0)
            {
                _logger.LogInformation("Processing LinkedChildren: {Processed}/{Total} items", processedCount, totalItems);
            }
@@ -311,11 +315,7 @@ internal class MigrateLinkedChildren : IDatabaseMigrationRoutine

        _logger.LogInformation("Found {Count} wrong-type alternate version items to remove.", wrongTypeChildIds.Count);

-        var itemsToDelete = wrongTypeChildIds
-            .Select(id => _libraryManager.GetItemById(id))
-            .Where(item => item is not null)
-            .ToList();
-        var deleted = DeleteItems(itemsToDelete!);
+        var deleted = ResolveAndDeleteItems(wrongTypeChildIds, "wrong-type alternate version items");

        _logger.LogInformation("Removed {Count} wrong-type alternate version items. They will be recreated with the correct type on next library scan.", deleted);
    }
@@ -342,11 +342,7 @@ internal class MigrateLinkedChildren : IDatabaseMigrationRoutine

        _logger.LogInformation("Found {Count} orphaned alternate version BaseItems to remove.", orphanedVersionIds.Count);

-        var itemsToDelete = orphanedVersionIds
-            .Select(id => _libraryManager.GetItemById(id))
-            .Where(item => item is not null)
-            .ToList();
-        var deleted = DeleteItems(itemsToDelete!);
+        var deleted = ResolveAndDeleteItems(orphanedVersionIds, "orphaned alternate version BaseItems");

        _logger.LogInformation("Removed {Count} orphaned alternate version BaseItems.", deleted);
    }
@@ -371,11 +367,7 @@ internal class MigrateLinkedChildren : IDatabaseMigrationRoutine

        _logger.LogInformation("Found {Count} items from deleted libraries to remove.", orphanedIds.Count);

-        var itemsToDelete = orphanedIds
-            .Select(id => _libraryManager.GetItemById(id))
-            .Where(item => item is not null)
-            .ToList();
-        var deleted = DeleteItems(itemsToDelete!);
+        var deleted = ResolveAndDeleteItems(orphanedIds, "items from deleted libraries");

        _logger.LogInformation("Removed {Count} items from deleted libraries.", deleted);
    }
@@ -427,8 +419,23 @@ internal class MigrateLinkedChildren : IDatabaseMigrationRoutine
        var skippedUnrootedItems = 0;

        var staleIds = new List<Guid>();
+        var checkedCount = 0;
+        _logger.LogInformation("Checking {Total} items for missing files.", itemsWithPaths.Count);
+
        foreach (var item in itemsWithPaths)
        {
+            // A miss on offline storage can block for the mount timeout, so report while scanning.
+            if (checkedCount > 0 && checkedCount % FileCheckProgressLogStep == 0)
+            {
+                _logger.LogInformation(
+                    "Checking for missing files: {Checked}/{Total} items, {Stale} stale so far.",
+                    checkedCount,
+                    itemsWithPaths.Count,
+                    staleIds.Count);
+            }
+
+            checkedCount++;
+
            // Expand virtual path placeholders (%AppDataPath%, %MetadataPath%) to real paths
            var path = _appHost.ExpandVirtualPath(item.Path!);

@@ -482,16 +489,47 @@ internal class MigrateLinkedChildren : IDatabaseMigrationRoutine

        _logger.LogInformation("Found {Count} stale items to remove.", staleIds.Count);

-        var itemsToDelete = staleIds
-            .Select(id => _libraryManager.GetItemById(id))
-            .Where(item => item is not null)
-            .ToList();
-        var deleted = DeleteItems(itemsToDelete!);
+        var deleted = ResolveAndDeleteItems(staleIds, "items with missing files");

        _logger.LogInformation("Removed {Count} stale items.", deleted);
    }

-    private int DeleteItems(IReadOnlyCollection<BaseItem> items)
+    private int ResolveAndDeleteItems(IReadOnlyCollection<Guid> ids, string description)
+    {
+        if (ids.Count == 0)
+        {
+            return 0;
+        }
+
+        return DeleteItems(ResolveItems(ids, description), description);
+    }
+
+    private List<BaseItem> ResolveItems(IReadOnlyCollection<Guid> ids, string description)
+    {
+        // Each lookup is a separate repository read; cached ones are fast, so this only reports
+        // once a set is large enough for the reads to add up to a noticeable stretch.
+        var items = new List<BaseItem>(ids.Count);
+        var processed = 0;
+        foreach (var id in ids)
+        {
+            if (processed > 0 && processed % ResolveProgressLogStep == 0)
+            {
+                _logger.LogInformation("Loading {Description}: {Processed}/{Total} items", description, processed, ids.Count);
+            }
+
+            processed++;
+
+            var item = _libraryManager.GetItemById(id);
+            if (item is not null)
+            {
+                items.Add(item);
+            }
+        }
+
+        return items;
+    }
+
+    private int DeleteItems(IReadOnlyCollection<BaseItem> items, string description)
    {
        if (items.Count == 0)
        {
@@ -500,8 +538,16 @@ internal class MigrateLinkedChildren : IDatabaseMigrationRoutine

        var options = new DeleteOptions { DeleteFileLocation = false, DeleteFromExternalProvider = false };
        var deleted = 0;
+        var processed = 0;
        foreach (var item in items)
        {
+            if (processed > 0 && processed % DeleteProgressLogStep == 0)
+            {
+                _logger.LogInformation("Removing {Description}: {Processed}/{Total} items", description, processed, items.Count);
+            }
+
+            processed++;
+
            try
            {
                _libraryManager.DeleteItem(item, options);
--- a/Show More
+++ b/Show More