SOLVED: Transcoding not working after migrating VM in the same host

[paaradiso]

I have a machine with a 10400 running PVE. I used to run jellyfin with podman in an alma LXC, but I've been moving everything over to a NixOS VM with podman.

The configuration is the exact same, but it now refuses to transcode anything.

Old configuration: https://sourceb.in/v0E1LNCTPO
New configuration: https://sourceb.in/7AAy3PD2DC - I have tried adding just /dev/dri/renderD128 and adding the user to a group, but nothing works.

Inside the container, the permissions are correct:


alpha@3a084e236d37:/dev/dri$ ls -la
total 0
drwxr-xr-x 2 root root      100 Jun 30 15:12 .
drwxr-xr-x 6 root root      360 Jun 30 15:12 ..
crw-rw---- 1 root tape 226,  0 Jun 30 15:12 card0
crw-rw---- 1 root tape 226,  1 Jun 30 15:12 card1
crw-rw-rw- 1 root  303 226, 128 Jun 30 15:12 renderD128
alpha@3a084e236d37:/dev/dri$ test -r renderD128
alpha@3a084e236d37:/dev/dri$ echo $?
0
alpha@3a084e236d37:/dev/dri$ test -w renderD128
alpha@3a084e236d37:/dev/dri$ echo $?
0

vainfo also works and outputs correct information: https://sourceb.in/9kA2Gy52t6

ffmpeg error with QSV, VPP off and regular tonemapping on: 

[AVHWDeviceContext @ 0x6537ff70ae40] No VA display found for device /dev/dri/renderD128.
Device creation failed: -22.
Failed to set value 'vaapi=va:/dev/dri/renderD128,driver=iHD' for option 'init_hw_device': Invalid argument
Error parsing global options: Invalid argument


VAAPI, VPP off, regular tonemapping on: 

[AVHWDeviceContext @ 0x57225032db00] Failed to get number of OpenCL platforms: -1001.
Device creation failed: -19.
Failed to set value 'opencl=ocl:0.0' for option 'init_hw_device': No such device
Error parsing global options: No such device

VAAPI, VPP on and regular tonemapping off: 

Device creation failed: -542398533.
[vist#0:0/hevc @ 0x62d6f742b440] [dec:hevc @ 0x62d6f7427bc0] No device available for decoder: device type vaapi needed for codec hevc.
[vist#0:0/hevc @ 0x62d6f742b440] [dec:hevc @ 0x62d6f7427bc0] Hardware device setup failed for decoder: Generic error in an external library
[vost#0:0/h264_vaapi @ 0x62d6f73f52c0] Error initializing a simple filtergraph

Another container (immich) is transcoding media normally, so the iGPU is properly passed through to the VM.

Does anyone know what's wrong?