How do i change the file preview image for mp4 files? I replaced the image but it doesnt show in my dock, instead it shows the first still of a movie

http://imageshack.us/photo/my-images/21/screenshot07m.jpg/
http://imageshack.us/photo/my-images/39/screenshot04s.jpg/
pls help. i change the file preview of a movie file, and it shows that i have changed the preview in finder but when i open the folder on my dock, it shows the still of the movie instead.
the image shows the film the hangover as an example. the movie poster is visible in finder, but reverts to a default movie still from the dock. this only seems to occur for mp4 files.

its nothing to do with itunes, its movies form the internet. i got the file preview by taking an image off the internet, pressing command c and pasting it on top of the small icon in the get info section

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