The time scale of a QTMovie object; the value for this key is of type NSNumber, interpreted as a long. This attribute can be read and (in Mac OS X 10.5 and later) written; in earlier versions of Mac OS X, this attribute is readable only. In general, you should set this attribute only on newly-created movies or on movies that have not been edited. Also, you should only increase the time scale value, and you should try to use integer multiples of the existing time scale.

This attribute can be read but not written when the movie has been initialized with QTMovieOpenForPlaybackAttribute set to YES.

Available in Mac OS X v10.4 and later.