If you have FFDshow installed there seems to be some settings wich could do the trick (but I'm too tired to try them myself).
Open the "ffdshow MPEG-4 Video decoder properties"
There is an option called "grab". In there you can select something like
grab every X frames.
If you know the framerate of your movie you can calculate X if you want to grab a frame every "something" seconds.
I hope this was of help to you.
Rafke P.
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