movie thumbnail in Pages

Sometimes when I import a movie the initial preview screen is black. There are no other options in the movie styles section, just black options. I tried changing the thumbnail by pasting a new image in the get info window in the finder. I see a new thumbnail in the finder icon but it is still black when I import it. The move plays fine. If I trim the move so it doesn't fade up from black, that works but is not ideal. Is there a way so select a frame and make that the preview image in Pages?