2023-09-25, 04:30 PM
The PGS subtitle messages are harmless and common. Not related to this issue.
Does this issue happen with the ORIGINAL file before you ran it through MKVToolnix? I've used MKVToolnix. Since you only added tracks, it SHOULDN'T have touched the video track. But Jellyfin's web and MPV players are less tolerant of errors. VLC plays just about anything, even if it is partially corrupted or poorly encoded. MPC has some tolerance for bad files from my experience.
Does this issue happen with the ORIGINAL file before you ran it through MKVToolnix? I've used MKVToolnix. Since you only added tracks, it SHOULDN'T have touched the video track. But Jellyfin's web and MPV players are less tolerant of errors. VLC plays just about anything, even if it is partially corrupted or poorly encoded. MPC has some tolerance for bad files from my experience.