Key features of Windows Media Video 9 Advanced Profile include improved interlaced support and transport format independence." See also Notes below. In 2005, the as-then-updated codecs page stated the following regarding the Advanced Profile: "This is a new codec that is included with Windows Media Player 10, the Windows Media Format 9.5 SDK, and the updated codec installation packages.
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In the near future, hardware acceleration of decoding will also make playback of both 720p and 1080p content possible even on midrange Pentium 4 class computers." WMV9_PRO offers variable bit rate encoding that provides "optimal quality with a lower average bit rate and file size."
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Its efficiency can bring high-definition quality to computer users, enabling storage and delivery of a complete movie at 720p resolution (1280 x 720 pixels per frame), with 5.1 digital discrete channel surround sound, on a single standard DVD. Windows Media Video 9 Professional defines profiles of the Windows Media Video 9 codec that are automatically applied at higher bit rates and resolutions. The Microsoft Windows Media web site codecs page is regularly edited and updated (see links listed in Useful references below) in 2004, the text included this note: "For content that requires ultra-high video quality. Moderate to excellent, considering this is a compression algorithm, varies according to level selected. See ASF for link to pages covering licensing of Windows Media and the Advanced Systems Format.ĭepends upon algorithms and tools to read will require sophistication to build tools. Generally used in files that represent a final-state format for end-user delivery. Comments on the best way to elucidate this topic are welcome. At this Library of Congress Web site, the VC-1 connection is highlighted in the description of WMV9, the fundamental Windows Media video codec.
At the same time, a number of profiles and levels were established for example, see the Wikipedia VC-1 article and this Microsoft information page (link available through Internet Archive). During 2006, however, SMPTE finalized the VC-1 standard (421M), thus placing the Microsoft video codec family more in the mainstream.
During 2005, the Microsoft Web site stopped referring to a "professional" codec and instead began promoting an Advanced Profile with features tailored to high definition video content (see Notes below). This format description seems to have been overtaken by events. Video bitstream produced by the Windows Media 9 professional video codec.
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