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Hello, I don't know how to solve this problem just because I have a same situation as you discribed. I read 5 USB cameras but only first two of CvCapture returned with other camerals return NULL. So, I try to read the camera dynamically. However, I am facing a new weird problem. You can see my problem at:

http://answers.opencv.org/question/57386/there-is-something-wrong-when-i-read-2-cameras/