jellyfin/MediaBrowser.Controller/MediaEncoding/TranscodingJob.cs, branch v12.0-rc5

Fix concurrent ffmpeg segment racing

2026-08-04T16:33:42Z

This is a nasty one. The failure mode is: 1. Request A started FFmpeg and waited for a segment. 2. Request B requested an earlier or far away segment. 3. Jellyfin thought FFmpeg should to restart at a different position. 4. Request B killed the existing transcoding job. 5. Killing that job cancelled the same token request A was using. 6. The cancellation produced http 500 to request A. To fix this: we lock transcoding job state changes and segment handling per playlist, and use a thread safe counter to track how many http responses are still using each job’s segments. A job is only stopped or replaced once that counter reaches zero.

move to new System.Threading.Lock type for better performance

2024-12-12T13:10:06Z

Remove BOM from UTF-8 files

2024-08-30T13:29:48Z

I think some people need to change their IDE configuration ;)

Add TranscodingSegmentCleaner to replace ffmpeg's hlsenc deletion

2024-03-15T23:35:05Z

FFmpeg deletes segments based on its own transcoding progress, but we need to delete segments based on client download progress. Since disk and GPU speeds vary, using hlsenc's built-in deletion will result in premature deletion of some segments. As a consequence, the server has to constantly respin new ffmpeg instances, resulting in choppy video playback. Signed-off-by: nyanmisaka

Rename and clean up TranscodingJob

2023-12-21T17:53:50Z