Subject:   -33- I want to write a program which creates a JPEG-
                compressed movie file, but I need to control the
                compression quality.  How do I do this with the Movie
                Library?
Date: Wed Nov 16 13:04:20 PST 1994

  Currently, the way to do this is to create a movie file with
  all the appropriate image track parameters (see above).  But instead
  of simply writing frames to the movie and letting the Movie Library
  automatically compress the frames for you, you handle the compression
  yourself.

  To do the compression yourself, you open a Compression Library JPEG
  compressor, set the quality factor, and use it to compress each
  frame.  Then you write the *compressed* data to the movie file
  (see above for instructions on how to do this).