Synchronizing multimedia components must be done carefully. Animation, DVDs, and sound each require a certain length of time to play--time that can vary from computer to computer. When you play these components together, making sure they start and stop at the right time in relation to each other is crucial to creating a smooth piece. Synchronizing sound with motion or DVDs usually requires repeated testing to determine how long each component takes to play, where any noticeable pauses occur when a component is loaded into memory, and the start and stop points for each component.
You can place icons to the right of sound or movie icons, creating a child icon. In addition, you can set those child icons to trigger based on the media position or number of seconds from when the media starts playing. See Media synchronization.
Another way to present sound and graphics together is to combine them in a digital movie. This guarantees that the sound and image remain synchronized. It also offers better performance than running a sound icon concurrently with another icon.
A common technique in a presentation is to display text and graphics synchronized with key points in an audio track containing voice-over narration. You can synchronize sounds with visuals by using the SyncPoint and SyncWait functions.
You can also use the MediaPosition variable for synchronization with digital movies such as QuickTime or Video for Windows.
Select Help > Show Me, and then launch A/V Synchronization to see an example of synchronizing sounds with graphics.
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