[x264-devel] How extract I-Frames from a video stream?

[amir.rouhi at rmit.edu.au]

I know that ffmpeg or x264 is enable to extract images at any desired time
interval from a video stream. i.e the below command:
ffmpeg -i test.avi -r 1 -s WxH -f image2 test-%03d.jpeg
extract 1 second image interval from test.avi. But i dont know how to
change this command to extract just I-Frames from the stream, regardless of
the frame time position.
Can u help me to find the solution? Or do you how x264 can extract I-Frames?
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