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Hi,

You've probably solved this by now, but i ran into the same problem so thought i'd share the answer.

Basically it's because there isn't enough bandwidth on the the USB.

If you change your resolution to say 320*240 it will work. You can force the camera to calculate the max resolution but i couldn't get that to work.

Hope this helps!

Oh, you've also given bot cameras the same device ID too, set one of them to 1 and the other to 2.