[MPlayer-users] Opteron, mencoder, DVD sound

[Taylor Smith]

Hey Even,

I had a similar problem when I started to use MEncoder. I was told that 
sometimes the 3-pass encoding makes sync problems because the the audio 
and video are processed seperately. (I don't know what truth there is to 
this, but it makes sense to me). Anyway, I've never had a problem when I 
do a two-pass encoding this way:

mencoder [source] [video codec and codec options for first pass] 
-nosound [output]
-- This pass will work on video, doing the first pass only and not doing 
sound.

mencoder [source] [-ovc and options] [-oac mp3lame -lameopts br=128:cbr] 
[output]
-- This pass will work on video doing the final encoding and also take 
audio from the DVD and mp3-encoding it. I've found that this pass is 
usually slower.

Hope I've helped. If you still have problems, email me.

--Taylor Smith

Even Larsen wrote:

>Hello
>
>I am using a AMD Opteron server to do some DVD backup work with mencoder.
>But I get a problem when I trie to dump the AC3 stream into a MP3 
>stream. When I rejoin the new mpeg4 encoded film with the new mp3 
>stream they are out of sync. When I just copy the AC3 stream into 
>the mpeg4 encoded film without reencoding the AC3 stream there is 
>no problem. I can't find any function in mencoder to fix this and 
>are currently using transcode to resync the sound, but this is not 
>a good solution. For the most part I just copy the AC3 stream. Do 
>anyone has a similar problem or anyone with a solution to the problem.
>I may be using wrong commandlines so here is the lines I use:
>
>Dumping the AC3 -> MP3:
>
>mencoder -ovc frameno -o frameno.avi -oac mp3lame -lameopts abr:br=192 
>-alang [language] dvd://[track]
>
>Encoding the film 2-pass:
>
>mencoder -oac copy -o /dev/null -ovc lavc -lavcopts vcodec=mpeg4:
>vbitrate=[bitrate]:vhq:vpass=1:vqmin=2:vqmax=31 -vop scale=[x:y] 
>-npp lb dvd://[track]
>
>mencoder -oac copy -o [output] -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=[bitrate]:
>vhq:vpass=2:vqmin=2:vqmax=31 -vop scale=[x:y] -npp lb dvd://[track]
>
>When the last pass is out of sync with the movie. I have tried the 
>last CVS version of mplayer, same problem.
>
>Even
>
>
>
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