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I was trying uvc_camera with my cheap webcam, but the images came out all white. After that, until plugged out and in again the webcam was outputting white even with usb_cam. You mentioned that it might be messing with parameters. And indeed, uvc_cam.cpp has like 15 hardcoded calls to set various parameters my webcam has probably never heard about. So, I commented out all those calls and it worked!