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Windows Media Video describes a collection of codecs developed by Microsoft Corporation. This includes WMV-9, which is the basis for the VC-1 standard used in HD-DVD and BluRay technology. |
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The Moving Pictures Expert Group (or MPEG) is the group responsible for developing the MPEG series of standards, including the popular MPEG-1 Layer 3 audio standard (MP3), the MPEG-2 standard (used on DVDs) and the MPEG-4 standard (implemented in many products, such as DivX, BluRay, and QuickTime). It is a working group of the ISO, formally named ISO/IEC JTC 1/SC 29/WG 11.<ref>{{cite web |title=MPEG: Who We Are |url=http://www.chiariglione.org/mpeg/who_we_are.htm}}</ref> |
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__FORCETOC__ |
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== History == |
== History == |
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The Moving Pictures Expert Group was founded in 1988, with the task to develop a standard for digital video compression for a number of telecommunication applications, including video telephony and digital television broadcasting. It has met 75 times since its first meeting in Ottawa, Ontario, Canada in 1998, and has developed several standards. In 1992 they approved the MPEG-1 standard, which was followed up in 1994 by the MPEG-2 standard used in DVDs. MPEG-4 was developed starting in 1993, and the first version was approved in 1998.<ref>{{cite web |title=MPEG: Achievements |url=http://www.chiariglione.org/mpeg/achievements.htm</ref> MPEG-7, a standard for multimedia content data, was approved in 2004.<ref>{{cite web |title=MPEG-7 Overview |url=http://www.chiariglione.org/mpeg/standards/mpeg-7/mpeg-7.htm}}</ref> |
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The Windows Media Video codec was developed to compete with Real Network’s RealVideo codec, and was based on a proprietary MPEG implementation until it was standardized as an MPEG-4 implementation upon the release of Windows Media Video 9. WMV-9 offered many improvements over previous WMV formats, including support for non-square pixel aspect ratios, and improved frame interpolation. <ref>{{cite web |title=Windows Media 9 Series Codecs |url=http://www.microsoft.com/windows/windowsmedia/forpros/codecs/video.aspx}}</ref> WMV-9 implements the Microsoft developed SMPTE 421M standard, which has gained acceptance through its use in HD-DVD and BluRay technologies. |
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== Implementations == |
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The Windows Media Video codec family is supported on a variety of devices – including all “PlaysForSure” devices.<ref name="plays">{{cite web |title=PlaysForSure |url=http://www.microsoft.com/windows/windowsmedia/playsforsure/}}</ref> The codec is well supported in Microsoft Windows; native support for the format is supplied in Windows Media Player, included with the operating system. <ref>{{cite web |title=Windows Media Video Quality |url=http://www.microsoft.com/windows/windowsmedia/demos/video_quality_demos.aspx}}</ref> The format is also implemented on the Xbox 360 gaming console.<ref>{{cite web |title=XBOX 360 Supported Formats |url=http://support.microsoft.com/kb/945416?sd=xbox}}</ref> Streaming is facilitated using the Microsoft designed ASF container. |
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== Controversy == |
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Complaints surrounding the WMV codec are usually due to its support of DRM. <ref name="plays"/> Recent criticism regarding WMV-DRM Licensing is due to the removed ability to back up and restore licenses as of the introduction of Windows Media Player 11.<ref>{{cite web |title=Microsoft Media Player Shreds Your Rights |url=http://www.theinquirer.net/en/inquirer/news/2006/09/21/microsoft-media-player-shreds-your-rights}}</ref> |
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== Current Work == |
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The MPEG group is currently working on the final approval phases of MPEG-4 versions 3, 4 and 5. Future standards include MPEG-21, a standard multimedia framework. |
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== See also == |
== See also == |
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[http://www. |
[http://www.microsoft.com Microsoft]<br /> |
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[http://msdn.microsoft.com Microsoft Developers Network] |
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== References == |
== References == |
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<references/> |
<references/> |
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Latest revision as of 14:54, 4 December 2008
Windows Media Video describes a collection of codecs developed by Microsoft Corporation. This includes WMV-9, which is the basis for the VC-1 standard used in HD-DVD and BluRay technology.
History
[edit]The Windows Media Video codec was developed to compete with Real Network’s RealVideo codec, and was based on a proprietary MPEG implementation until it was standardized as an MPEG-4 implementation upon the release of Windows Media Video 9. WMV-9 offered many improvements over previous WMV formats, including support for non-square pixel aspect ratios, and improved frame interpolation. [1] WMV-9 implements the Microsoft developed SMPTE 421M standard, which has gained acceptance through its use in HD-DVD and BluRay technologies.
Implementations
[edit]The Windows Media Video codec family is supported on a variety of devices – including all “PlaysForSure” devices.[2] The codec is well supported in Microsoft Windows; native support for the format is supplied in Windows Media Player, included with the operating system. [3] The format is also implemented on the Xbox 360 gaming console.[4] Streaming is facilitated using the Microsoft designed ASF container.
Controversy
[edit]Complaints surrounding the WMV codec are usually due to its support of DRM. [2] Recent criticism regarding WMV-DRM Licensing is due to the removed ability to back up and restore licenses as of the introduction of Windows Media Player 11.[5]
See also
[edit]Microsoft
Microsoft Developers Network