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Skip SIDX in fMP4 HLS segments

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Prevent FFmpeg's SIDX path from rewriting open-GOP boundary packet timestamps. HLS uses the media playlist for segment indexing and does not require the SIDX box.
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alchemyyy
2026-07-30 17:15:01 -07:00
parent b15d3c9ad3
commit 893662ba50
1 changed files with 3 additions and 2 deletions
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Jellyfin.Api/Controllers/DynamicHlsController.cs
+3 -2
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@@ -1607,8 +1607,9 @@ public class DynamicHlsController : BaseJellyfinApiController
if (state.VideoStream is not null && state.IsOutputVideo)
{
// fMP4 needs this flag to write the audio packet DTS/PTS including the initial delay into MOOF::TRAF::TFDT
hlsArguments += $" {(useLegacySegmentOption ? "-hls_ts_options" : "-hls_segment_options")} movflags=+frag_discont";
// fMP4 needs frag_discont to write the audio packet DTS/PTS including the initial delay into MOOF::TRAF::TFDT
// HLS does not use SIDX, and skipping it avoids FFmpeg rewriting open-GOP boundary packet PTS
hlsArguments += $" {(useLegacySegmentOption ? "-hls_ts_options" : "-hls_segment_options")} movflags=+frag_discont+skip_sidx";
}
segmentFormat = "fmp4" + outputFmp4HeaderArg;