Subtitle burn-in won't use extracted embeded subtitles

[homelabResearcher]

So this may be the difference between what is built into the kernel vs what packages are available.  6.6 probably has all the drivers built into the kernel and Ubuntu 22.04 may be missing some of the driver packages to make it work prior to that kernel.  ADL-N came out quite a bit later than 22.04 so driver packages are probably not available in the Jammy repos.

Thank you for your reply. Just did a reboot on that machine with 6.5 hwe kernel, got same results though (logs attached). I think transcoding is handled by intel-media-va-driver-non-free thus it's kernel invariant. Also same file fails on my Windows backup server. 

Probably the problem is, after subtitle extraction, ffmpeg should be able to load these subtitles externally as other external subtitles (i.e. downloaded by OpenSubtitle plugin) and probing issues would be gracefully addressed on Jellyfin side (C# world, not these driver or ffmpeg stuff).