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Variable Speed Playback with MPG2

Discussion in 'Windows Media' started by RHS, Mar 16, 2010.

  1. RHS

    RHS Flightless Bird

    Hi,

    I have code to control the playback speed of a video using the Windows Media
    Player (Version 10) as an ActiveX control. The code works using WMV files,
    although it does not work using MPG2 video.

    How do I make it (Windows Media Player) allow variable playback speeds of
    MPG2 videos? Is there a codec I can use that supports this?
     
  2. On Tue, 16 Mar 2010 12:23:01 -0700, RHS
    <RHS@discussions.microsoft.com> wrote:

    >I have code to control the playback speed of a video using the Windows Media
    >Player (Version 10) as an ActiveX control. The code works using WMV files,
    >although it does not work using MPG2 video.
    >
    >How do I make it (Windows Media Player) allow variable playback speeds of
    >MPG2 videos? Is there a codec I can use that supports this?


    Most ASF files contain video using the WMV codec in various forms. All
    of those formats support indexed seek and variable speed play in WMP.

    Most other formats don't support variable speed and may not even have
    an index to allow WMP to effectively seek within the file.

    MPEG2 is a bit of a special case being DVD video in most guises, and a
    few tricks are used - in general proper seek support depends on the
    installed decoder (proper in this sense includes both the ability to
    accurately seek to non-keyframes and being able to playback and resume
    without glitches)

    You cannot rely *at all* on the end user having *any* MPEG2 decoder,
    which are usually purchased (added cost) so I'd stick to more
    recognised formats which are suitable for streaming - MPEG2 is not
    easy to optimise for streaming delivery and usually results in very
    high bitrates compared to WMV9 Advanced Profile, or H264 (MPEG4)
    video.

    Cheers - Neil
    ------------------------------------------------
    Digital Media MVP : 2004-2010
    http://mvp.support.microsoft.com/mvpfaqs
     

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