I copied code from https://stackoverflow.com/a/34588758/210342 and used with default (built-in) camera, it worked. Then I attached USB camera, tested it with VLC and changed the code to open camera 1
:
cam = cv2.VideoCapture(1)
I check whether the camera is open cam.isOpened()
— it is — but the camera is not enabled (its hardware indicator, LED, is off) and indeed all I see on the screen is black frame.
Is there some extra special code to add in order to enable USB camera?
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Answer
Are you sure the usb camera is camera 1, i’ve done this before and had to use cv2.VideoCapture(0)