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Key-frames distribution

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  • vaxis
    Junior Member
    Junior Member
    • May 2002
    • 16

    Key-frames distribution

    Here's my programs for encoding DVDs:
    Nandub to do a first pass
    Check the keyframes distribution in GordionKnot
    Nandub to do a second pass

    I always scan through the whole movie in GordionKnot and look if the keyframes is at a position where there actually is a scene change. Is this necessary to do? (it is really timeconsuming!)
  • khp
    The Other
    • Nov 2001
    • 2161

    #2
    Unless you want to be able to cut the avi file, at the scene change, it doesn't make a lot of difference, if it's a key frame or not.
    Donate your idle CPU time for something usefull.
    http://folding.stanford.edu/

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    • vaxis
      Junior Member
      Junior Member
      • May 2002
      • 16

      #3
      so if I have understand it, where the key-frames is located have no impact on the quality?

      If that's the case, is key-frames only in movies for cutting-purpose?

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      • khp
        The Other
        • Nov 2001
        • 2161

        #4
        What I'am saying is that, the codec will decide when it's most efficient to use a key frame. If the codec doesn't put a key frame at a scene change it's because it could be encoded more efficiently as a partial frame.

        Of course seeking will become a lot harder if there is very few key frames. This is why the maximum keyframe interval is set to 300 by default. This ensures that we get a keyframe at least every 10 or 12 seconds which works quite well, on any reasonably fast PC.
        Last edited by khp; 24 Oct 2002, 11:38 AM.
        Donate your idle CPU time for something usefull.
        http://folding.stanford.edu/

        Comment

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