mvGetNumTracks - determine number of tracks in a movie instance
int mvGetNumTracks( MVid id )
Function to determine the number of tracks in a movie instance.
mvGetNumTracks returns the total number of tracks in the movie. This
includes any tracks that existed when the movie was opened and any that
have been added since. Whenever a track is added or removed, this number
mvIntro(3dm), mvAddTrack(3dm), mvFindTrackByIndex(3dm).
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