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How to configure a video4linux loopback device

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http://unix.stackexchange.com – I am writing an application which is based on Motion. Motion allows me to define a video4linux loopback device: # Output images to a video4linux loopback device # The value '-' means next available (default: not defined) ; video_pipe value # Output motion images to a video4linux loopback device # The value '-' means next available (default: not defined) ; motion_video_pipe value Motion already accesses the webcam to detect motion, now I would like to access images of the webcam, too. I think the loopback device is the right thing to do this. But what do I have to do exactly? Do I have to (HowTos)