QSV not working after restart

[TheDreadPirate]

Hello,
I have similar setup and similar issue: QSV not working after Proxmox restart but only if Jellyfin LXC is auto-started without delay...
If I start Jellyfin LXC manually some time after Proxmox boot - QSV works just fine.
As a workaround I set 30sec delay for auto-starting Jellyfin container but... yeah... I would like to solve the root cause.
Any ideas how to troubleshoot this?
I have run mentioned methods when Jellyfin was in "corrupted" state but didn't find any obvious issue...

That is very strange.  I'm not aware of any services specifically tied to Intel media drivers that LXC would need to wait on.