If you have an old PC or MacBook, a cheap Video Capture device like the Digitnow (22.99€ from Amazon) seems to work fine.
Initially I was considering Blackmagic and Elgato, but I’ve read mixed reviews about the results using MacBook Pro and USB-C, and didn’t feel like throwing 150€ just to see if one of them works for me.
I doubt this Digitnow would run on my MacBook Pro, but for less than 25€… In any case, I was thinking in using the MacBook Pro for sending video, Lumen, etc., into the Visual Cortex, and the old Mac for recording.
The quality seems pretty good. If interested, I could list the codecs included and the maximum resolution. In any case, way better than my up-to-now attempts at recording from the TV (which included multiple unwanted reflections, knocking the camera off a few times, and the “textures” one gets from filming from TVs… though they also have their charm). Anyway, for now it’s just for fun, to record some experiments with the Visual Cortex. I have no illusions of becoming a Pro anytime soon.