[MPlayer-users] Syncronization problem

Reimar =?UTF8?Q?D=F6ffinger?= Reimar.Doeffinger at stud.uni-karlsruhe.de
Tue Dec 21 17:12:56 CET 2004


Hi,
> > [...]
> > > Instead of 3 pass encoding try 2 pass (it's equivalent to 3 pass, just a little bit slower):
> > > 
> > > mencoder video.avi -oac mp3lame -lameopts cbr -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1600:vpass=1:mbd=2 -o newvideo.avi
> > > mencoder video.avi -oac mp3lame -lameopts cbr -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1600:vpass=2:mbd=2 -o newvideo.avi
> > > (remove vhq because it is equivalent to mbd=1 and you have mbd=2 too)
> > 
> > Isn't it possible to use -oac copy on the first pass, thus making it a bit faster?
> 
> There is a misunderstanding here.

I agree.

> 
> With 3 pass what you usually do is:
> 
> Pass 1: audio encoding
> Pass 2: video encoding
> Pass 3: video encoding
> 
> With 2 pass what you usually do is:
> 
> Pass 1: audio+video encoding
> Pass 2: audio+video encoding
> 
> What you are suggesting is:
> 
> Pass 1: audio encoding
> Pass 2: video encoding
> Pass 3: audio+video encoding


No, I suggest

Pass 1: video encoding + audio copy
Pass 2: audio+video encoding

My theory is that it should work, but it's just a theory ;-)

Greetings,
Reimar Döffinger




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