[vlc-devel] vlc: svn commit r24676 (ileoo)
massiot at via.ecp.fr
Tue Jan 29 15:05:36 CET 2008
On Tue, Jan 29, 2008, Ilkka Ollakka wrote:
> On ti 29. tammikuuta 2008 15:18:31, Ilkka Ollakka wrote:
> > On ti 29. tammikuuta 2008 13:34:21, Christophe Massiot wrote:
> > > On Tue, Jan 29, 2008, Subversion daemon wrote:
> > > > - if user requests certain bitrate, set defaults to qmax=51,qmin=10 if
> > > > user hasn't defined them otherwise. Should help normal user to get
> > > > bitrate he/she requests.
> > >
> > > This is only suitable for MPEG-4, with MPEG-1/2 the quantizers are too
> > > high.
> > Is there somewhere any documentation about suitable quantizer-values on
> > different codecs ?
> I checked ffmpeg-sources, and seems that ffserver sets qmin=3, and
> libavcodec doesn't have other checks on qmax/qmin other than 1<=x<=51.
> So would qmin=3 be reasonable default in mpeg2 and mpeg4 case?
It is definitely reasonable for MPEG-2, probably too low for MPEG-4.
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