
Changing a Movie's Shape with a Video Mask
You can change the shape of a movie from rectangular to other shapes using a video mask. In combination with a media skin; you can "skin" a movie so that it plays in a non-rectangular region (for example, a movie could play from within a ship porthole), and then use a mask to restrict the movie's shape to the desired playback region.
Use a graphics program to create the mask and save it as a QuickTime-compatible file (for example, BMP, GIF, JPEG, or PICT). The mask should be a black shape on a white background. The movie appears through the black shape.