Check out this video by EposVox: Linux Capture Cards Guide
He’s a streamer that goes over a bunch of different capture cards, their performance on Linux, and which features work the best. He also gives some helpful tips on Linux Streaming in general.
It’s a little old, but should still get you on the right path.
Looks pretty clean as is, I would need to see without picsto fully know, but looks good as is imo.