QuickTime 3 Reference

Hints

QuickTime 1.6.1, 2.0, and 3 defined several new movie and media playback hints. These new hints work with the SetMoviePlayHints and SetMediaPlayHints functions.

hintsAllowBlacklining: Instructs the Movie Toolbox to use blacklining (displaying every other line of the image) when playing a movie. Blacklining increases the speed of movie playback while decreasing the image quality. This hint is ignored if the decompressor for the movie data does not support blacklining.
hintsDontPurge: Instructs the toolbox not to dispose of movie data after playing it. The toolbox leaves the data in memory, in a purgeable handle. This can enhance the playback of small movies that are looping. However, it may consume large amounts of memory and therefore affect the performance of the Memory Manager. Use this hint carefully.
hintsInactive: Tells the toolbox that the movie is not in an active window. This can allow the toolbox to allocate scarce system resources more efficiently. The movie controller component automatically sets this hint for all movies it manages.
hintsHighQuality: Specifies that the given movie or media should render the highest quality. For example, the video media handler should turn off fast dithering and use high-quality dithering.; Because rendering at the highest quality takes much more time and memory than rendering at a lesser quality, this mode is usually not appropriate for real-time playback. However, since this mode generates higher quality images, it is useful when recompressing.