Cant get GPU transcoding working

[TheDreadPirate]

For the record, your GPU cannot decode AV1.

Also, transcoding only happens when the client needs it. It doesn't happen for every playback. If the client can play the video as it, the server will just send the file unmodified.

A couple things will always occur on the CPU: 1) audio transcoding and 2) subtitle burn in. But subtitle burn in would involve the GPU as well. So the CPU usage you are seeing is almost certainly audio transcoding.