[MPlayer-users] Syncronization problem

[Giacomo Comes]

On Tue, Dec 21, 2004 at 05:12:56PM +0100, Reimar D?ffinger wrote:
> 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

>From where do you take the audio stream to copy
if you don't do an audio encoding first?

Giacomo