A/V sync issue that only happens in jellyfin

[TheDreadPirate]

Browsers have limited codec and container support. Additionally, most browsers don't support selecting audio/subtitles tracks other than the first track. So if you select a secondary audio/subtitle track it will trigger a remux. If the original video had some presentation time stamp issues, desync is possible.

The remux command we ran will copy the original video/audio/subs to a new container with proper presentation time stamps (genpts), which can help with desync issues.