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Encyclopedia > WMV9

Windows Media Video (WMV) is a generic name for the set of proprietary streaming video technologies developed by Microsoft. It is part of the Windows Media framework. Something proprietary is something exclusively owned by someone, often with connotations that it is exclusive and cannot be used by other parties without negotiations. ... Streaming can refer to either of the following : In online media, Streaming allows data to be transferred in a stream of packets that are interpreted as they arrive for just-in-time delivery of multimedia information. ... Microsoft Corporation, (NASDAQ: MSFT) headquartered in Redmond, Washington, USA, was founded in 1975 by Bill Gates and Paul Allen. ... Windows Media is a framework for media creation and distribution for Microsoft Windows. ...


WMV is not built solely on Microsoft in-house technology. From version 7 (WMV1), Microsoft has used its own non-standard version of MPEG-4. The video stream is often combined with an audio stream of Windows Media Audio. Microsoft Corporation, (NASDAQ: MSFT) headquartered in Redmond, Washington, USA, was founded in 1975 by Bill Gates and Paul Allen. ... MPEG-4, introduced in late 1998, is the designation for a group of audio and video coding standards and related technology agreed upon by the ISO/IEC Moving Picture Experts Group (MPEG). ... Windows Media Audio (WMA) is a proprietary compressed audio file format developed by Microsoft. ...


WMV files are customarily played by Windows Media Player on Microsoft Windows and Macintosh systems. Some third-party players also exist, such as MPlayer for Linux, which play back WMV by using the FFmpeg implementation of the WMV codecs. Windows Media Player is a free software media player used for playing audio and video on personal computers running Microsoft Windows. ... Microsoft Windows is a range of closed source proprietary commercial operating environments for personal computers and servers. ... Macintosh, also known as Mac for short, is a family of personal computers manufactured by Apple Computer, Inc. ... MPlayer is a free, open source media player with support for more multimedia formats than any other media player. ... Tux, a penguin, is the official Linux mascot. ... FFmpeg is a set of open source computer programs that can record, convert and stream digital audio and video. ... Codec is a portmanteau of coder/decoder, which describes a device or program capable of performing transformations on a data stream or signal. ...


Raw WMV video is packed into an AVI or Advanced Streaming Format (ASF) container. The resulting files may be named .avi if it is an AVI-contained file, or .wmv or .asf if it is an ASF file, but .wmv files are to be ASF files with audio/video content only. AVI, an acronym for Audio Video Interleave, is a video file format introduced by Microsoft in November 1992, as part of the Video for Windows technology. ... Advanced Streaming Format (or ASF, later renamed into Advanced Systems Format) is Microsofts proprietary digital audio/digital video wrapper, especially meant for streaming. ...


WMV is usually found in the AVI file container when encoded with Microsoft's Windows Media Video 9 VCM software for Windows. Microsoft's Windows Media Player for the Mac does not support all WMV encoded files since it supports only the ASF file container. AVI, an acronym for Audio Video Interleave, is a video file format introduced by Microsoft in November 1992, as part of the Video for Windows technology. ... Advanced Streaming Format (or ASF, later renamed into Advanced Systems Format) is Microsofts proprietary digital audio/digital video wrapper, especially meant for streaming. ...


WMV also features digital rights management facilities. Digital Rights Management, abbreviated DRM, is an umbrella term referring to any of several technical methods used to control or restrict the use of digital media content on electronic devices with such technologies installed. ...


Microsoft has submitted Version 9 codec to the Society of Motion Picture and Television Engineers (SMPTE), for approval as an international standard. (As of Jan 2005, the SMPTE is reviewing the submission under the draft-name "VC-1"). This codec is also used to distribute high definition video on standard DVDs in a format Microsoft has branded as WMV HD. This WMV HD content can be played back on computers or compatible DVD players. The Society of Motion Picture and Television Engineers or SMPTE (pronounced simptee or sometimes sumptee) is a US professional association of engineers. ... VC-1 is the title of the SMPTE standardization effort of a video codec based on Microsoft Windows Media Video version 9. ... High-definition television (HDTV) means broadcast of television signals with a higher resolution than traditional formats (NTSC, SECAM, PAL) allow. ... DVD is an optical disc storage media format that can be used for storing data, including movies with high video and sound quality. ... Windows Media Video High Definition is a software technology by Microsoft which makes it possible to watch high definition movies in 1280 x 720 (720p) or 1920 x 1080 (1080p) resolution. ...


See also

  • FFmpeg - a third-party WMV decoder library
  • MPlayer - third-party open source cross-platform media player capable of playing many WMV files
  • Windows Media Audio - the sound-only counterpart

FFmpeg is a set of open source computer programs that can record, convert and stream digital audio and video. ... MPlayer is a free, open source media player with support for more multimedia formats than any other media player. ... Windows Media Audio (WMA) is a proprietary compressed audio file format developed by Microsoft. ...

External links

  • Windows Media Homepage at Microsoft (http://www.microsoft.com/windowsmedia/)
  • Description of the algorithm used for Windows Media encryption (http://www.spinnaker.com/crypt/drm/freeme/Technical)
  • Windows Media High Definition Video (http://www.wmvhd.com)

  Results from FactBites:
 
DVD to WMV9 with WMA9Pro 5.1 Multichannel Audio - Hydrogenaudio Forums (1647 words)
WMV9 particulrly excels at low bitrate video encoding (although I haven't compared it to the XviD 1.0 beta's).
Both WMV9 and WMA9Pro are tweaked for low bitrates (particularly the video, I don't think the audio could beat HE AAC), but I agree a bitrate of around the 256 mark would be better.
Not surprised with your encoding times dude; my first WMV9 rip was done in a Pentium II 400, and it took 26 hours for me to finish it.
MacAddict Forums / Windows Movie Maker 2 better than iMovie ? (426 words)
WMV9 clips are typically half the size of the respective QuickTime clip, with quite comparable quality.
The WMV9 clips come out sharper but somewhat blockier during fast action scenes, whereas the QuickTime clips are just softer overall and have very noticeable compression artifacts throughout.
The only disadvantage is that WMV9 requires a beefier processor to decode, especially at higher resolutions.
  More results at FactBites »

 
 

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