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Fatal Playback Error - Printable Version

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Fatal Playback Error - Smuggles - 2025-09-18

Hello,

First I'd like to apologize if I'm asking this question in the wrong place.

I recently got a UGreen NAS which doubles as a media server. When I have hardware transcoding turned on, any media in the .mkv format completely fails to play. I can get around this issue by turning hardware transcoding off, but that puts more load on the CPU, which I'd prefer to avoid.

As far as I can tell, the solution for this would be to install/upgrade the version of FFMPEG that Jellyfin uses, but I have no idea how to do that on the NAS through UGOS and Docker.

Attached is a log file created when I attempted to play some .mkv media.

If anyone can help me out that would be much appreciated, thank you.