Obs deregocnizing iSight camera.

I have an interesting problem.

Using obs24.0.2 for Mac on Mac OS 10.11.6, I could see four cameras. One camera is the built-in iSight camera. Then there are also two other cameras and one video feed.

The last one I inserted was the second video feed and though the Mac operating system and OBS can see it when I turn it on it does not turn on. By the way my eyesight camera is never used but is always a default camera.

I heard that Mac obs around that range can only recognize one USB camera per native USB 2.0 port or equivalent in higher USB ports.

If that's the case I need OBS to somehow derecognize my eyesight camera, so it recognize the two cameras I set up intentionally.

By the way I sent all my videos downstairs on analog on 640 by 480. If there's a limit to pixels with that help bring it in line as opposed to doing 1280x720?

Is there a certain limit to the amount of video that could be processed in terms of vertical lines times horizontal lines times bits per pixel times frames per second?
 
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