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Old 22 Oct 2002, 03:30 AM   #1
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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!)
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Old 22 Oct 2002, 03:36 AM   #2
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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.
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Old 24 Oct 2002, 02:55 AM   #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?
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Old 24 Oct 2002, 04:20 AM   #4
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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
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