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RTP: Audio and Video for the Internet by Colin Perkins

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Chapter 7. Lip Synchronization

  • Sender Behavior

  • Receiver Behavior

  • Synchronization Accuracy

A multimedia session comprises several media streams, and in RTP each is transported via a separate RTP session. Because the delays associated with different encoding formats vary greatly, and because the streams are transported separately across the network, the media will tend to have different playout times. To present multiple media in a synchronized fashion, receivers must realign the streams as shown in Figure 7.1. This chapter describes how RTP provides the information needed to facilitate the synchronization of multiple media streams. The typical use for this technique is to align audio and video streams to provide lip synchronization, although the techniques ...

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