SOLVED: Playback Error Playback failed due to a fatal player error.

[pizuhh]

There is a separate log file that is generated when ffmpeg is run for transcoding.  They are in the same directory as the main jellyfin log and the file names all start with "FFmpeg".

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A couple of things, though.  From the log you have provided, you enabled AV1 transcoding.  Your CPU is not able to handle software transcoding to AV1.  Nor HEVC.  Uncheck both of those and it will transcode to H264 which your CPU should be able to reasonably handle.

Thanks that fixed it!