Ffmpeg

Be sure to check you / print your own ffmpeg documentation!
http://ffmpeg.mplayerhq.hu/ffmpeg-doc.html

examples

extract frames (100 seconds per frame) and number the images using "zero-padded 6 digits":

<source lang="bash"> ffmpeg -i rearwindow.avi -f image2 -y -r .01 -an rearwindow%06d.jpg