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Chapter 3. Object Description and Synchr... > Timing Model and Synchronization of ...

3.3. Timing Model and Synchronization of Streams

In the previous section we saw how to associate a set of streams with one another in order to describe a multimedia presentation composed of a large set of such streams. The presentation of these streams in a coordinated manner is basically governed by the scene description. Therefore, a clearly defined notion of time must be established between the scene description and all the media streams. Then, a mechanism is needed to convey such timing information. This is achieved by the synchronization layer syntax specified in [MPEG-4-1, Clause 10]. The synchronization layer often is abbreviated as sync layer or SL.

3.3.1. Modeling Time

Time appears to be the most natural thing in the world—it passes by even when we aren't thinking of it. Unfortunately, in the context of multimedia streaming, a lot of thought has to be dedicated to the proper definition of the notion of time.


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