take a look here
http://www.oz9aec.net/index.php/gstreamer/473-using-the-logitech-c920-webcam-with-gstreamer

On Sun, Oct 28, 2012 at 3:11 PM, rklosinski <rich@klo-group.com> wrote:
Im interested in steaming from usb as well. Im trying to use a Logitech HD920
w/ built in H.264. When I plug the camera in I get /dev/video0 device, but I
cant figure out what the video source would be for gst-launch. I tried
gst-launch -v v4l2src, but the pipe cannot be found.



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