QuickTime 3 Reference
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A tween track is a special track in a movie that is used exclusively as a modifier track. The data it contains, known as tween data, is used to generate values that modify the playback of other tracks, usually by interpolating values. The tween media handler sends these values to other media handlers; it never presents data. For an introduction to modifier tracks, see Creating Movies With Modifier Tracks .
Typical tween components may just interpolate numeric values, but others can perform complex tweening, such as finding intermediate data between one matrix or polygon and another. For further information, see Tween Components
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