Playback error: h264 file with AC3 audio will not playback on swiftfin

[TheDreadPirate]

Try remuxing one of the files and test the new file.  This will copy the existing video/audio into a new container.  Since there is no encoding it should take a few seconds to complete.

Code:

/usr/lib/jellyfin-ffmpeg/ffmpeg -fflags +genpts+igndts -i "/MEDIADRIVE/SERIES/Millennium/Season 1/Millennium - 01x01 - Pilot.mp4" -map 0 -codec copy -max_muxing_queue_size 2048 -max_interleave_delta 0 -avoid_negative_ts disabled newFile.mp4

Then try playing the new file.

Hello again! 

I did this and the file actually plays!

....However - the timecode just stays at 0:00 the whole time. I can't search / forward or rewind when playing. And I cannot switch between the audio tracks. Luckily it played with the standard track and not the commentary. This is very mysterious.... does this make any sense at all?

I also made a .mkv-version, leaving the video and converting the audio to aac, using ffmpeg and this one works normally (except that it only has one audio track - i guess i messed up the CLI command)

Something is off spec or broken with that file.  These flags, -fflags +genpts+igndts, are supposed to help deal with some weird container issues.

Try running the same command without those flags and see what happens with the resulting file.