Overview

This chapter describes the tween media handler, which lets you use tween data stored in a tween track to modify the presentation of other tracks algorithmically. For information about creating and using tweens, see Chapter 26, "Tween Components and Native Tween Types."

A QuickTime movie can include one or more tween tracks, which are modifier tracks that contain tween data. When a movie includes a tween track, the tween media handler invokes the tween component (or native QuickTime code) needed to process the tween data and delivers the resulting values to one or more other media handlers.

The chapter is divided into the following major sections:

• "About the Tween Media Handler" introduces the tween media handler, tween tracks, and tween data.
• "Using the Tween Media Handler" describes how to create and use tween tracks to modify other tracks.
• "Constants" describes the constants used with the tween media handler.