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• REPLAY MEDIA GUIDE
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• EMUSIC
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• AUDIBLE
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• SOUNDTAXI
  remove DRM protection from Windows Media, iTunes music and video files

Windows Media video format (.WMV, .ASF files)

Windows Media Video (WMV) is a generic name for the set of video codec technologies developed by Microsoft. It is part of the Windows Media framework. The codecs were originally developed as proprietary codecs for low-bitrate streaming applications. However, in 2003 Microsoft drafted a video codec specification based on its Windows Media Video version 9 codec and submitted it to SMPTE for standardization. The standard was officially approved in March 2006 as SMPTE 421M, thus making the Windows Media Video 9 codec no longer a proprietary technology. Earlier versions of the codec (7 and 8) are still considered proprietary as they fall outside the SMPTE 421M standard.

WMV is not built solely on Microsoft in-house technology. It is believed that WMV version 7 (WMV1) was built upon Microsoft's own non-standard version of MPEG-4 Part 2. However, as WMV version 9 has been standardized as an independent SMPTE standard (421M, also known as VC-1), it's reasonable to believe that WMV has sufficiently evolved in a different direction than MPEG-4 to be considered a unique codec in its own right. There are currently (April 2006) 16 companies in the VC-1 patent pool. Microsoft is also one of the members of the MPEG-4 AVC/H.264 patent pool.

The video stream is often combined with an audio stream of Windows Media Audio (WMA) and encapsulated in Advanced Systems Format (ASF) files, carrying the .WMV or .ASF file extensions.

Windows Media Video: .WMV, .ASF, .AVI, .MKV container formats

WMV is generally packed into an Advanced Systems Format (ASF) container format. It can also be put into AVI or Matroska containers. The resulting files may be named .AVI if it is an AVI-contained file, or .WMV or .ASF if it is an ASF file, or .MKV if it is a Matroska file. WMV can be stored in an AVI file when encoding with the VirtualDub encoder and using the WMV9 VCM codec implementation. Microsoft's Windows Media Player for the Mac does not support all WMV encoded files since it supports only the ASF file container. More files can be played with Flip4Mac and Quicktime or MPlayer for Mac OS X.

WMV HD - high definition video on standard DVD

Besides being one of the most popular codecs for distributing video on the Internet, the 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.

Players supporting Windows Media Video .WMV and .ASF files

WMV files are played by players such as MPlayer or Windows Media Player. Many third-party players exist for various platforms such as Linux that use the FFmpeg implementation of the WMV codecs.

Windows Media Player (WMP) 11 is the latest version of Microsoft's media player. You can download Windows Media Player for Windows, Windows Mobile and Mac OS platforms.

WMV and Digital rights management (DRM)

While the Windows Media Video codec itself does not contain any digital rights management (DRM) facilities, the Advanced Systems Format (.ASF) container format, in which a WMV stream may be encapsulated, can.

Some players like ubiquitous Apple iPod do not support DRM protected .WMV files. Besides DRM protected WMV files consume more energy and it means that you can watch less videos on your portable devices. Luckily in many cases it is possible to remove DRM protection using lossy or lossless DRM removal software (DRM remover).

Downloading/Recording/Capturing/Ripping/Saving Windows Media video stream

To download/record/capture/rip/save .WMV/.ASF video stream you may use streaming media recorder that supports Windows Media format and the protocol used (RTSP, MMS or HTTP).

WM Recorder is an easy and very powerful stream recorder. It can record Windows Media video streams (.ASF, .WMV) and audio streams (.WMA) streamed through the RTSP, MMS and HTTP protocols. In the PRO and ADA mode WM Recorder can capture packets from Windows Media Player. That is why WM Recorder can capture more Windows Media streams than any other stream recorder.