Q How do I determine the correct time values to pass to GetMoviePict to get all
the sequential frames of a QuickTime movie?
A The best way to determine the correct time to pass to get movie frames is to
call the GetMovieNextInterestingTime routine repeatedly. Note that the first
time you call GetMovieNextInterestingTime, its flags parameter should have a
value of nextTimeMediaSample+nextTimeEdgeOK to get the first frame.
For subsequent calls, the value of flags should be nextTimeMediaSample, and
the whichMediaTypes parameter should include only tracks with visual
information, VisualMediaCharacteristic, or "eyes." Check the Movie Toolbox
chapter of the QuickTime documentation for details about the
GetMovieNextInterestingTime call.