-28- When writing frames to a movie with the Movie Library, if we fix the image track parameters, does the byte size

                of the frame remain constant across frames?
Date: Mon Mar 25 10:04:18 PST 1996

  In general, no.  The compression codecs return variable size byte
  counts for the frames they compress. 

  However, in later versions of the movie library (eg, IRIX 6.2),
  some codecs support generation of a constant bitrate. Use the
  parameter DM_IMAGE_BITRATE when creating an image track. (Note
  that this is not supported by all codecs; CinePak is the only
  one currently supporting this feature.)

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