[MPlayer-users] mencoder 2-pass

[cmisip]

I thought the point of two pass is that the first pass generates a log
file that is used to plan the bitrate use for the second pass.  Then it
only makes sense to have the same settings for the quantizer on both
passes.  I could be wrong.




On Sun, 2004-04-11 at 12:14, D Richard Felker III wrote:
> On Sun, Apr 11, 2004 at 04:38:55PM +0200, Matthias Wieser wrote:
> > Hi,
> > 
> > what's the preferred method for 2-pass encoding into mpeg4?
> > 
> > Documentation only says:
> > mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -oac copy -o 
> > movie.avi
> > mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=2 -oac copy -o 
> > movie.avi
> > 
> > Some people recommend to use constant quantisizer for the first pass, some 
> > recommend to use the same variable bitrate as in pass two.
> > 
> > What should produce better quality nowadays?
> 
> Using the same or similar bitrate for the first pass has produced
> slightly better results in all the tests I've seen.
> 
> Rich
> 
> _______________________________________________
> MPlayer-users mailing list
> MPlayer-users at mplayerhq.hu
> http://mplayerhq.hu/mailman/listinfo/mplayer-users
>