I’m not an expert,but maybe you can use a 4K video capture card, then encode it to AV1 using GPU acceleration preferably. It’s a bit of a hassle,but it might work.
I never used to donate to any FOSS project, now I donate every alternative month since I realized what I liked about the internet and tech is being taken away by greedy corporates.
Check out new songs from youtube, spotify, music sites and later download them and store them locally as 256 or 320 kbps mp3 files. I used to be a fan of billboard Top 100, but nowadays it’s just crap. Occasionally I do purchase from the artist’s site if available just to support them.