[MPlayer-users] mencoder 2-pass

[D Richard Felker III]

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