What's the easiest way to move to the next frame?
A The easiest way is to use a Movie Controller to accomplish this. The
controller does not need to be visible, but it must reside in the same grafPort
as your movie. You can send mcActionStep to the controller to bump the movie to
a new frame.
See chapter 2 of Inside Macintosh: QuickTime Components for complete
details on using a Movie Controller, pp. 2-3 to 2-75.