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Has anyone had problems opening 2 USB camera streams at the same time if they are both the same brand and model?

I am trying to play around with a stereo camera rig I built. Both cameras are exactly the same, 2.0MP ELP brand. It uses the USB Video Class (UVC) 1.1 driver. Both cameras are tested and working. I can open them individually in a simple opencv c++ program. The stereo program i wrote works with one ELP camera and my Logitech webcam. (and that's with all three USB cameras connected to the pc.)