Take a single snaphot from a webcam with a delay

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http://askubuntu.com – I use gst-launch-0.10 v4l2src num-buffers=1 ! jpegenc ! filesink location=$HOME/Desktop/test.jpg to take snapshots. It works well. However in some light situation i need to drop some of the first frames the webcam outputs so that the webcam white balance dosen't provide me with an impossible to view image. Do you know how could i do that? With the GUI of cheese i can do it without any problem, but i need to automate this via CLI. Many thanks. (HowTos)