swf to jpg using ming/imagemagick?

Hey- I'm interested in taking a flash file and somehow extracting a frame of it, saving that frame as a jpg. I see the swf and ming functions in the php docs but it appears that it cannot read an existing SWF. Even if it could, I'm not sure how much help that would be. I've also investigated using imagemagick for this,b ut no luck there, either. Does anyone know if this is possible? Thanks, Michael