Icon previews - mp4 files

Leopard can show icon previews for mp4 files now. But most of my mp4 files start off with a few frames of blank screen - so my icons (when I choose to display them) are just an ugly little black square.
Anyone know if you can specify a frame of the mp4 movie that you want to use as the icon??
Thanks.

Actually, I've just answered my own question!
A bit long-winded...
Start to play the mp4 in Quicktime.
Pause at a suitably artistic moment in the action.
Shift-cmd-4 to take a selection of the screen and grab it as a file (I have my system set so it grabs it as a jpg.)
Open that jpg in Preview.
Select some of the image and cmd-C to copy it
Cmd-I to open the 'info' on the file in question.
Highlight the icon in the top left corner.
Cmd-V to 'overwrite' that with the image you have just put on your clipboard.
It works! But like I said, it does seem a VERY circuitous route.
Also seems to highlight the fact that you can use any size of jpg image as an icon. Is this something new in Leopard?
Anyway, I'm sure there's a clever person out there who knows how to do this 'properly'...?

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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.
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Displaying icons as previews of files
In Finder windows and on the desktop, the icons for files can appear as thumbnail previews of the file contents. For example, instead of seeing a generic icon for a PDF file, you can see a miniature version of what’s in the PDF file. If you “hover” over the icon for a movie or sound file, you’ll see a Play button, which you can click to view the movie or hear the sound. (If you don’t see a Play button, enlarge the icon.)
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If you’re working in a Finder window, you can also set the following options, depending on which view you’re using:
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Icon previews - mp4 files

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