SOLVED: My odyssey with a new server with Intel A40 Pro.

[nyanmisaka]

Arc A40 Pro should be no different from Arc A380 in hardware transcoding capabilities.

Some firmware or kernel options not enabled may cause AV1 encoding failures.
But your CPU contains an iGPU that doesn't support AV1 encoding. Make sure jellyfin is using the dGPU instead of the iGPU.

https://jellyfin.org/docs/general/admini...pu-support

https://jellyfin.org/docs/general/admini...e-on-linux