Wired Movies and Sprites

Adding Actions

When you wire a sprite track, you add actions to it. Wired sprite tracks may be the only tracks in a movie, but they are commonly used in concert with other types of tracks. Actions associated with sprites in a sprite track, for example, can control the audio volume and balance of an audio track, or the graphics mode of a video track.

Wired sprite tracks may also be used to implement a graphical user interface for an application. Applications can find out when actions are executed, and respond however they wish. For example, a CD audio controller application could use an action sprite track to handle its graphics and user interface.

These wired actions are not only supported in sprite tracks. In principle, you can "wire" any QuickTime media handler. In QuickTime 4, all of these may contain actions: QuickDraw 3D, QuickTime VR, text, and sprites.

For a complete description of all available wired actions, including those new to QuickTime 4, refer to Chapter 6, "Wired Movies API Reference."