I have a problem with the way I capture footage from my N64. Every 0.5 seconds my screen turns black for a single frame the audio is still present is that ok for video proof?

that might be a problem, you could post the link to it so we can check it out

Here is an example https://drive.google.com/file/d/1Me-0hRZjF27_7du6gn1fMea6-V5o5ivc/view?usp=sharing

Had a look, and I noticed that the problem with your screen seems to often occur when Link is in the middle of doing his animations (for instance, pulling out a Bomb or jumping). I don’t think it’ll be too big of a problem as it only lasts for a frame of each animation and I was still able to make out what was going on despite the flickering, but I do think you should check to see if there are any problems with your capture card or TV just in case.