so apparently default 'OS' on Pi4 uses v4ĺ2 encoder, should be easy to create profile for (just copy vaapi one and edit ) and as bonus you can find  python +  ffmpeg encoding manager ....

another random project is wayland capture program, might not work on intel due to fb modifiers (?)

and all this because adventurious user 'goat' reported he had better luck with cin-gg on arm  single-board computer under Wayland/Xwayland - namely timeline scrolling performance.