...MPEG-2 Architecture & Compressions
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[edit] Overview
Within the International Organization for Standardization (ISO), a working group was established in the late 1990s. Known as the “Moving Pictures Experts Group”, they defined an “area of work” intended to develop international standards for...
- compression,
- de-compression,
- processing, and
- coded representation
...of moving pictures, audio, and their combination, in order to satisfy a wide variety of applications.
The MPEG Working Group developed MPEG-1, followed by MPEG-2. As of 2000, they released the specification for MPEG-4, an international, standardized media architecture:
Although unrelated to media architectures and the playout of audio or video content, the MPEG Working Group is also working on standards for metadata and tracking the life cycles of intellectual content through the MPEG-7 and MPEG-21 areas of work:
- MPEG-2 is Digital Television
- Quoted from an article entitled The MPEG Video Standards-from 1 to 21, authored by Larry Bouthillier, February 18, 2004, copyrighted to StreamingMedia.com.
- "The MPEG2 standard builds upon MPEG1 to extend it to handle the highest-quality video applications. MPEG2 is a common standard for digital video transmission at all parts of the distribution chain. Broadcast distribution equipment, digital cable head-ends, video DVDs, and satellite television all employ MPEG2; as do point-to-point streaming devices like the vBrick."
- "MPEG2 needs about 6Mbps to provide the quality you're used to seeing on movie DVDs, although data rates up to 15Mbps are supported. 720X480 is the typical 4:3 default resolution, while 1920x1080 provides support for 16:9 high-definition television."
- It is worth noting that the public's exposure to MPEG-2 has been though cable delivery systems, satellite delivery systems, and DVD-video discs. This quality of video/audio is based on the simple profile for MPEG-2. The advanced profile accommodates high definitiion ATSC television as well as HD-DVD and Blu-ray high density DVD formats. For a chart of the different profiles and levels associated with the MPEG-2 architecture, reference a section from the Wikipedia article on MPEG-2 called Profiles and Levels.
[edit] Resources
- MPEG-2 Article from the Wikipedia
- http://en.wikipedia.org/wiki/MPEG-2
- MPEG Architecture (1 ,2 , MP3, 4, 7, 21)(authoring by Media Solutions, University of Utah)
- http://stream.uen.org/medsol/digvid/html/2B_mediaarchmpeg1.html
- Comparison of MPEG-1 and MPEG-2 Formats & Encoding (within the context of DVD-Videodiscs)
- http://stream.uen.org/medsol/dvd/pages/dvd_format_video4DVDvideo.html
- MPEG-2, Overview of the Standard
- http://www.chiariglione.org/mpeg/standards/mpeg-2/mpeg-2.htm
- MPEG Industry Forum
- http://www.m4if.org/
- MPEG Home Page (Motion Pictures Experts Group)
- http://www.chiariglione.org/mpeg/
- MPEG Video Standards - from 1 to 21, article by Larry Bouthillier, 18 Feb 2004
- http://www.streamingmedia.com/article.asp?id=8569&page=1&c=7
- Article about the challenge of using MPEG-2 compressed video in non-linear editing systems
- http://www.bmserver.net/Down_SW/Tech_Paper/Challenge_MPEG2_Eng.pdf
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