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my 11 year old son working on a project with a robot surveillance camera. has encountered a problem that really confuses me. He Use RF wireless camera that connects via USB grabber to a computer . When activating the program for video capture, we have the option to choose two cameras. One is a web camera with the computer, and the other is rf wireless camera. When I choose a web camera appears on the screen image, but when I select rf wireless camera on the screen is blank. I must mention that the errors do not occur as gstreaming critical . I don't no what the problem is. I apologize if there are errors in the writing because I use google translate.