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Supported Formats

The MediaElement object supports the following formats. These encodings are supported regardless of the file name extension.

Video:

• WMV1: Windows Media Video 7
• WMV2: Windows Media Video 8
• WMV3: Windows Media Video 9
• WMVA: Windows Media Video Advanced Profile, non-VC-1
• WMVC1: Windows Media Video Advanced Profile, VC-1

Audio:

• WMA 7: Windows Media Audio 7
• WMA 8: Windows Media Audio 8
• WMA 9: Windows Media Audio 9
• MP3: ISO/MPEG Layer-3
  • Input: ISO/MPEG Layer-3 data stream
  • Channel configurations: mono, stereo
  • Sampling frequencies: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, and 48 kHz
  • Bit rates: 8-320 kbps, variable bit rate
  • Limitations: "free format mode" (see ISO/IEC 11172-3, sub clause 2.4.2.3) is not supported.

Other formats

MediaElement also supports playlists in the form of Advanced Stream Redirector (ASX) files, also known as Windows Media metafiles. Although the file name extension does not matter, these files typically have a .asx, .wax, .wvx, .wmx, or .wpl extension. For more information about these file types, see Windows Media Metafiles.

출처 : http://msdn.microsoft.com/en-us/library/bb412386.aspx