The DVR feature of Windows XP Media Center Edition, Windows Vista and the Windows 7 version of Windows Media Center create files in this format. Files in this format are generated from the Stream Buffer Engine (SBE.dll), a DirectShow component introduced in Windows XP Service Pack 1. The format extends these standards by including metadata about the content and digital rights management. Video is encoded using the MPEG-2 standard and audio using MPEG-1 Audio Layer II or Dolby Digital AC-3 (ATSC A/52). Multiple data streams (audio and video) are wrapped in an ASF container with the extension DVR-MS. DVR-MS ( Microsoft Digital Video Recording) is a proprietary video and audio file container format, developed by Microsoft used for storing TV content recorded by Windows XP Media Center Edition, Windows Vista and Windows 7.
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