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Thread: Key-frames distribution

  1. #1
    Junior Member
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    Question 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!)

  2. #2
    The Other khp's Avatar
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    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/

  3. #3
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    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?

  4. #4
    The Other khp's Avatar
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    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 at 12:38 PM
    Donate your idle CPU time for something usefull.
    http://folding.stanford.edu/

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