[MPlayer-users] quantizers in divx2pass with CVS mencoder/lavc

[D Richard Felker III]

On Tue, Oct 28, 2003 at 08:45:31PM +0100, HR wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> In the mplayer-1.0pre1 release version, encoding with lavc, I think the
> divx2pass file listed the quantizers as an (apparantly) decimal number
> between 1.0000 etc. and 31.0000 etc. I pulled down a mencoder/ffmpeg CVS
> on october 27 for a get_buffer() lavc fix (the 1st pass of a dvdrip
> crashed towards the end, leaving the divx2pass logfile zero size), and
> the quantizers now seem to be listed as an integer in a 3 digit range or
> so. I've turned off various options, cutting it down to a bare minimum,
> but the q numbers remain. What changed, and is it documented somewhere?
> How should I check the quantizers now? I checked the docs pages and the
> changelogs, but cant seem to find any information... Docs/changelogs
> unfortunately usually aren't this detailed anyway, and since this must
> be a fairly recent change, there's no point googling either (even though
> I optimisticly did try a little). It's not really important, but my
> quantizer-checker-fixer-upper-script stopped working ;)

Divide the new numbers by 128 to get the mpeg4-style quantizers.

> Which is better (besides using my eyes...); considering the quantizers
> or the PSNR?

PSNR should be better.

Rich