Only on TV: 'player error encountered'

[banchev]

Well, it looks like in terms of hardware it is all OK with my LXC based on this output: https://prnt.sc/G9TkH5xzJxqE

This error related to the XDG_RUNTIME_DIR and X server when running vainfo in my LXC container shouldn't be the case since Jellyfin primarily uses FFMPEG for transcoding.

But in fact, I suppose that is the source of my issue since I get this log now: https://pastebin.com/Ch41Z4P7

Code:

[AVHWDeviceContext @ 0x55afb461ef00] No VA display found for any default device.
Device creation failed: -22.
Failed to set value 'vaapi=va:,kernel_driver=i915,driver=iHD' for option 'init_hw_device': Invalid argument
Error parsing global options: Invalid argument

And this error suggests that the VA-API device is not being recognized or created. I shall try installing it and add to the LXC. 

But before that, do you have any other suggestions?