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Chapter 9. Media Streaming > Time and Synchronization

9.6. Time and Synchronization

Above the media coding layer is the media synchronization layer. In iTV, the time model could be viewed as having two components: methods by which one encodes and decodes time, and methods by which various components of the program are related and integrated. Each iTV program has a single time line whose encoding is based on a clock model, and component relationships are defined with respect to that clock rather than with respect to each other; the relationship to the clock is either asynchronous, synchronized, or synchronous.

9.6.1. IP-based

The RTP is the underlying foundation for IP-based delivery of audio and video content [RTP]. Recent activity is focused on RTP payload formats that support media delivery in general, and delivery of digital video in particular (see RFC 3189). These activities focus on constraints on the values of fields in the RTP header. Typically, the following values are constrained (see RFC 1889 for the RTP header description):


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