Using Plasma Wayland on Debian sounds like you’re deliberately setting yourself up for a lot of pain.

I was under the impression that libsvtav1 was still underdeveloped, but turns out the ffmpeg documentation for it was just lacking. Looks to be pretty good quality and even supports two-pass (which the documentation doesn’t mention).

I wish they made a 100x leap to the AV1 encoder. Even on my 12900k it runs at like 0.001x real time, which is… well, unusably slow.