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Additionally you might encounter problems when using two cameras simultaneously specially on a USB 2.0 interface. The first camera connected to USB host tries to reserve all the available bandwidth leaving nothing for the second cam. Error Message: VIDIOC_STREAMON: No space left on device

Solution:

1. Calculate bandwidth required manually and make appropriate configurations.
2. Put cameras on different USB hosts.

Ref thread http://answers.opencv.org/question/4909/using-2-webcams-simultaneously/