Quote:
Originally Posted by sirt
You could answer such and such number will imply an agressive or higher decision but it is not the answer I expect in fact. I would like to know what is the probability to demean the video if I set a purely random number for keyint or/and I set scenecut differently from it's default value.
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The higher the keyframe interval, the higher quality you get and the less accurate seeking is during playback since the player can only jump to IDR frames. (Or seeking is slower, if you want to seek to a specific location by decoding all frames from the last IDR frame). Quality improvements diminish quickly, so --keyint 1000 or --keyint infinite is usually not significantly better than --keyint 250.
Quote:
Originally Posted by sirt
To sum up, it appears that default values are "magical" in so far as they may work well for each video which is still obscur to me.
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They are just sensible. In case of --keyint, that range is about 50 to 1000 at ordinary framerates, depending on how much you value seeking accuracy/speed.