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MPEG 4

MPEG 4. Shaojie Zhang Anjum Gupta Dept. of Computer Science and Engineering. Outline. Overview Technical Detail Industry and Market Conclusion. Overview. MPEG-1 - Error free environments MPEG-2 - Broadcast TV (SD and HD) MPEG-4 - Object based coding

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MPEG 4

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  1. MPEG 4 Shaojie Zhang Anjum Gupta Dept. of Computer Science and Engineering

  2. Outline • Overview • Technical Detail • Industry and Market • Conclusion

  3. Overview • MPEG-1 - Error free environments • MPEG-2 - Broadcast TV (SD and HD) • MPEG-4 - Object based coding • MPEG-7 - Multimedia description • MPEG-21 - Seven element initiative for multimedia deployment

  4. An open toolbox to build bitstreams and decoders for multimedia content: Synthetic interactive graphics content To accommodate various user devices Lower bit rate encoding What is MPEG-4

  5. Object Based Encoding MPEG-4 audiovisual scenes are composed of several media objects. Still objects (e.g. fixed background) Video objects (e.g. a talking person) Audio objects MPEG 4 – Basic Approach

  6. Encoding Example

  7. An example of an MPEG-4 Scene

  8. Scene Description Format • An MPEG-4 scene structure is represented as a DAG. • Each node is a media object. • Multiplexed with the media objects.

  9. Flexibility within MPEG-4 • Various algorithms to handle special cases. • The stream is made of atomic units called Video Objects (VOs). • Audio Visual Objects (AVOs) are combined to create a scene.

  10. Bit rate variability Generic coder is extended by adding “Shape” input.

  11. Coding Tools and Algorithms VLBV (Very Low Bit-rate Video) core can be extended by adding more information.

  12. MPEG-4 Encoding

  13. Decoding

  14. An Application

  15. Companies having MPEG-4 products • Index of Companies • Ahead Software • Amphion Semiconductor • Apple Computers • Bitmanagement Software GmbH • Dicas Digital Image Coding GmbH • DivXNetworks, Inc. • Emblaze Research • Envivio • Equator Technologies, Inc. • Fraunhofer Institute IIS-A • Hantro Products Oy • Harmonic Inc. • iVAST Inc. • Nextreaming Corporation • Octaga AS • Philips Electronics • Prodys • Sci-worx GmbH • Sorenson Media • Soundball, Inc. • Toshiba • Tvia, Inc. • VBrick Systems, Inc. • VCS Video Communication Systems AG • VideoSpheres Inc. • Xilinx Inc.

  16. MPEG Market Penetration US Market Penetration – growth from year 0 (introduction) – 10 (From: The Yankee Group).

  17. MPEG Media Distribution US Video-On-Demand Subscriber Forecasts (From: The Yankee Group)

  18. MPEG 4 Vs Other Technologies

  19. Conclusion • MPEG-4 enables very low bit-rate multimedia communications. • MPEG-4 is a dynamic standard, that is continuously being improved. • Is being accepted in the industry applications. • Expanding demand in the market.

  20. References • ISO/IEC JTC1/SC29/WG11 N4668 • ISO/IEC JTC 1/SC 29/WG 11N2826 • ISO/IEC JTC 1/SC 29/WG 11N5504 • MPEG-4 Industry Forum (http://www.m4if.org)

  21. Acknowledgement • Dr. Wo Chang, NIST, U.S. • Dr. Kai-Kuang Ma, NTU, Singapore

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