[MPlayer-users] 3pass audio sync problem

[D Richard Felker III]

On Sun, Jun 29, 2003 at 10:35:20AM +1000, Renai wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> hi,
> 
> wondering if anyone can help me out with a sync problem I am having. I am 
> encoding files from dvd using 3 pass encoding, and the latest version of 
> mplayer, 0.90. Can I also say firstly, that I am eternally grateful for 
> mplayer, it has meant that I can use linux fulltime. I recommend it to 
> everyone, it is one of the best pieces of software I have ever seen.
> 
> Anyway, I use the following commands:
> 
> mplayer -dumpstream -dvd 1
> 
> mencoder -ovc frameno -o frameno.avi -oac mp3lame -lameopts 
> fast:preset=standard stream.dump
> 
> mencoder -oac copy -o /dev/null -ovc lavc -lavcopts 
> vcodec=mpeg4:vhq:aspect=4/3:vbitrate=540:vpass=1 -vop lavcdeint stream.dump
> 
> mencoder -oac copy -o divx.avi -ovc lavc -lavcopts 
> vcodec=mpeg4:vhq:aspect=4/3:vbitrate=540:vpass=2 -vop lavcdeint stream.dump
> 
> Now the problem that I am having, is that every time I play a file created 
> with these commands, the video and sound are slightly out of sync, enough so 
> that I can notice it, but not enough to really be annoying.
> 
> When I encode files with 2 pass encoding, using the following commands, I 
> don't have the same problem.
> 
> mencoder -o /dev/null -ovc lavc -lavcopts vcodec=mpeg4:vhq:aspect=4/3:vpass=1 
> -vop lavcdeint -oac copy stream.dump
> 
> mencoder -o divx.avi -ovc lavc -lavcopts vcodec=mpeg4:vhq:aspect=4/3:vpass=2 
> -vop lavcdeint -oac copy stream.dump
> 
> Can anyone enlighten me as to what I am doing wrong here, or is this a 
> limitation of mplayer?

It's just that 3pass mode is a stupid hack that's bound to cause
problems. Personally I advocate it's removal, or at least that it not
be included in mplayer-g2's mencoder...

Rich