Did you ever get it to work?
Hello, Lucio.
I also have the Matrox VS4 capture card. Until now I had used it with Wirecast since, as you know, it is prepared for this integration. Now, however, I need to use OBS Studio as well, and I have come across the problem that, although the program recognizes the inputs, when you add them as a video source, the signal from the cameras does not get in. Still in black. Looking for a solution to this problem, I came across this post of yours from 5 years ago, and I was wondering if you could finally use it. I would greatly appreciate if you could tell me something about it. Thank you.