IntroductionMPEG4 Visual is an encoding and compression system for digital multimedia content defined by the Motion Pictures Expert Group (MPEG). MPEG-4 includes simple, core, main, simple scalable, N-bit, basic animated texture, scalable texture, simple FA, advanced real time simple, core scalable, advanced coding efficiency, advanced core, advanced scalable texture, simple FBA, hybrid, advanced simple, fine granularity scalable, simple studio, and/or core studio profiles as defined in ISO/IEC 14496-2:2001 [Part 2 Visual dated 2001-12-01], 14496-2:2001/Amd.1:2002 [Studio profile dated 2002-02-01], or 14496-2:2001/Amd.2:2002 [Streaming video profile dated 2002-02-01].
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MPEG-4 is an ISO/IEC 14496standard developed by MPEG (Moving Picture Experts Group). MPEG-4 builds on the proven success of three fields: Digital television; Interactive graphics applications (synthetic content); and Interactive multimedia (World Wide Web, distribution of and access to content). MPEG-4 provides the standardized technological elements enabling the integration of the production, distribution and content access paradigms of the three fields.
MPEG-4 is meant to become the universal language between broadcasting, movie and multimedia applications. It will provide additional functionality over simple media compression, like bitrate scalability, object-based representation.
MPEG-4 does this by providing standardized ways to: (1) represent units of aural, visual or audiovisual content, called "media objects". These media objects can be of natural or synthetic origin; this means they could be recorded with a camera or microphone, or generated with a computer; (2) describe the composition of these objects to create compound media objects that form audiovisual scenes; (3) multiplex and synchronize the data associated with media objects, so that they can be transported over network channels providing a QoS appropriate for the nature of the specific media objects; and (4) interact with the audiovisual scene generated at the receiver´s end.
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