SOLVED: Can't get intel a380 working properly

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You need what's after the part of the log you provided to get any real info. That's just the ffmpeg command, not the result of it. Also, the ffmpeg log will provide better details.

First things I would check are whether the user running JF has access to the device (requires sudo privileges):

Code:

usermod -aG render jellyfin

Also, this info from the HWA guide:

The LTS kernel 6.6.26+ and the stable kernel 6.8.5+ have unresolved i915 driver bugs, which break HDR/DV tone-mapping on Intel Gen 12.5 DG2 / ARC A-series GPUs. If you are affected, please refrain from upgrading to those kernel versions.

But before you go log diving and kernel swapping, make sure the user running Jellyfin has been added to the render group and try this: go to VA-API in the JF HWA menu and enter "/dev/dri/renderD129" and save. Now go back up, swap to QuickSync and try again. There isn't a way to select the target once you've selected QSV, but it appears to respect the VA-API setting...