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Old 24th May 2009, 19:04   #1  |  Link
simps
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Join Date: Feb 2005
Posts: 149
Why is --qcomp 0.6 default for 2passes?

*** Look at post #49 at page 3

Well, after a lot of tests with real life video, anime and footage from PC game (Counter Strike), I really don't see any good reason for --qcomp 0.6 to be the default setting when doing 2 pass encode. There is a very unbalanced distribution of bits when --qcomp is at 0.6, producing good looking static and slow motion scenes, and very bad fast moving scenes. This would only be reasonable, when there are non high motion on the clip at all, but this is not real in 99% of cases.

The high motion scenes are bad with --qcomp 0.6, unless you are using some overkill bitrate to make it look good, which is a waste, considering what better settings for 2passes like --qcomp 0.9 can do with much less bitrate.

From my tests, --qcomp 0.9 could be easily a good default for 2passes.

And I am actually using --qcomp 0.94.

Can someone explain why --qcomp 0.6 is default for 2passes, what is the logic behind that? I mean, I want to know when is it better than something like --qcomp 0.9? I believe there are situations where 0.6 would be better than 0.9, but from what I've seen, they are the vast minority. Why make a default setting for the vast minority?

Thanks,
Simps

Last edited by simps; 26th May 2009 at 08:05. Reason: rule 9
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