WMV Files

WMV (Windows Media Video) is a generic name for video encoding solutions developed by Microsoft. The format is a part of the Windows Media framework that also includes formats like Windows Media Audio (WMA), Advanced Systems Format (ASF) and High Definition Photo (HDP). WMV files use the Microsoft container format and represent Microsoft's own version of MPEG-4 (Part 2) video encoding technology.

First introduced in 1999, the WMV format now competes with other codecs such as DivX and RealVideo as a means of distributing video content on the World Wide Web. Microsoft introduced subsequent versions of the codec in the years 2001 and 2003.

WMV files are played by the built-in player in Windows - Windows Media Player (version 7 upwards) - and most third party video players such as the VLC Media Player, BSPlayer, MPlayer and WinAMP.

The .wmv extension usually describes files in ASF format that use Windows Media Video codecs. As for the audio codecs, they're usually versions of Windows Media Audio or the Sipro ACELP.net audio codec. The extension is sometimes shortened to .wm.

Although it's usually packed into the ASF container format, the WMV file can also be converted to AVI, using the WMV9 video compression manager codec implementation.
Main features

The main features of Windows Media Video are:

* Data delivery over a wide variety of network protocols
* Suitable for local playback
* Advanced multimedia capabilities:
o Extensible media types
o Component download
o Scalable media types
o Stream prioritization as defined by the author
o Support for multiple languages
o Document and content management

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