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Without any more information, I'll hazard the guess that cap(0) uses the first device (your built-in camera). Have you tried opening the second device? So: cap(1)?

Without any more information, I'll hazard the guess that cap(0) uses the first device (your built-in camera). Have you tried opening the second device? So: cap(1)?

Edit: please do not ask two questions in one post. Use a new post for your second question.

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