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6.1. Objectives

MPEG-4 is an ISO/IEC standard developed by MPEG for communicating interactive audiovisual scenes. The standard defines a set of tools that provide the binary coded representation of individual audiovisual objects, text, graphics, and synthetic objects. The interactive behaviors of these objects and the way they are composed in space and time to form an MPEG-4 scene are dependent on the scene description, which is coded in a binary format known as binary format for scenes (BIFS—presented in Chapter 4). The audiovisual streams are defined as elementary streams (ESs) and managed according to the object descriptor (OD) framework (see Chapter 3, which describes the relationships both between the scene description and the streams and among the streams themselves). In addition, the OD framework defines additional streams for object content information (OCI), MPEG-J, and intellectual property management and protection (IPMP).

XMT is a textual representation of MPEG-4 Part 1: Systems [MPEG4-1], using the extensible markup language (XML) [EXML00]. MPEG-4 Systems structures are represented as XML elements, with attributes of the element containing its values. For example, the BIFS Material node is represented by the element <Material>. The Material node's emissiveColor field becomes an attribute of the <Material> element—that is, <Material emissiveColor="1.0 0.0 0.0"/>.


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