QuickTime 4 Reference

Support for Progressive Downloads

The QuickTime 3 Movie Toolbox includes support for progressive downloads, which allow part of a movie to be displayed before all of its data has been received over a network or other slow link.

Applications that use the movie controller component provided by Apple automatically get support for progressive downloads. Applications that do not use the standard movie controller can use the two high-level functions for progressive downloads, QTMovieNeedsTimeTable and GetMaxLoadedTimeInMovie , to determine whether a movie is being progressively downloaded and, if so, to see how much of it has already been downloaded. Finally, the few applications that need even more control over progressive downloads, such as control over individual tracks or media, can use one or both of the low-level functions for progressive downloads, MakeTrackTimeTable and MakeMediaTimeTable .

For more information, see "Functions for Progressive Downloads" .