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14.7. Object Descriptors

Chapter 3 describes the OD framework in MPEG-4 as a powerful and flexible framework that serves the goal of separating the information about the content of ESs from the information on how to compose that content in the scene. The description of MPEG-4 streams can be very complex, ranging from SL and decoder configuration information to the definition of alternative and scalable content, use of IPMP tools, and object content information (OCI).

14.7.1. Syntactic Description Language

Because it is important for the discussion in this chapter, a brief recap of the essentials of SDL is given here (see also Chapter 3). SDL is the language that was invented by MPEG [MPEG4-1] to describe the layout of data on bitstreams using syntax borrowed from C++.[1]

[1] Note that MPEG SDL is different than ITU's SDL (www.tdr.dk/public/SDL/whatis.html).


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