Save a series of images from a video? I'm doing a film where I'll be adding drawings on top of a film, so I need still frame of the film. I've found how to just save one image, but is there a way to say save an image/screenshot of a film every quarter second so that I have a series of images to work off of?  Did that make a lick of sense? 

Thanks! 

Edited to add: m.ardito solved it for me.  I'm doing the drawings in corel painter so I just needed images to use in there.  Thanks for all the help everyone. :)
Have a look at camera tracking in Blender. BlenderGuru and BlenderNation have tutorials on this. Note that this is different from camera mapping.

Yes, this does not answer the question posed directly above, but I believe it poses the motivation behind the question - how to create a 'drawing' that follows the film.