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List:       mplayer-users
Subject:    [MPlayer-users]  Sync Problems dumping DVD audio
From:       Sebastian <sinnloseadresse () yahoo ! de>
Date:       2010-12-28 20:17:22
Message-ID: 928804.50957.qm () web24714 ! mail ! ird ! yahoo ! com
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> > 
> > Hi, 
> > 

> <snip/>

> > 
> > If the dvd contains more than one audio source (germany and english), >the
> script creates a multi audio avi.
> 
> > This works on 98% of my dvds. 
> 
> > Now sometimes the audiodumps have different sizes, and the resulting >avi 
> will have a out of sync on at least
> one channel. (playback of this dvd folder is fine!) 

> When you are working with multiple video or audio streams, you should
> make sure that they are identical in every way: bitrate, sample rate, etc.

They are of course identical. The problem is that on these particular dvd, there are \
like 1-2 megabytes missing in one of the audio tracks.

> On some dvds I get away by using:
> 
> mplayer -dvd-device ""$BASE_FOLDER""$DVD_FOLDER"" dvd://"$CHAPTER" -aid
"$AUD1_1" -vo null -cache
> 8192 -ao pcm:waveheader
> 
> for ripping the audio.
> 

> When you do this, you are decompressing the audio. If you decompress
> both audio streams, you should be OK.


As mentioned, it works for 98% of my dvds



> But there are still some that dont work. I tried -mc 1, -mc 0 -forceidx
-noskip(mencoder) and nobps 
> 
> Then I had another search on the web and I found
> 
> mencoder -mc 1 -noskip -forceidx -dvd-device ""$BASE_FOLDER""$DVD_FOLDER""
dvd://"$CHAPTER" -aid
> "$AUD1_1" -ovc copy -oac lavc -lavcopts acodec=ac3:abitrate=192 
> -af pan=2:1.0:1.0:1.0:1.0,volnorm -of mpeg -o temp.mpg

> What you are doing here is re-encoding the audio at 192 kbps. If you do
> this for *both* audio streams, then they will have the same bitrate, and
> in theory you should have no problems.



both resulting mpg files work fine, if you watch them seperatly. File sizes of the \
two .mpg files are (again) different.



> 
> Now the strange thing: If I let this run for both languages into 
> separate temp.mpg's, the resulting temp.mpg's will be absolutely synced.
> But both have different sizes again, and I cannot rip them.
> 

> When you say that "both have different sizes again", what do you mean?
> Why can't you rip them? What happens when you try?

first of all, both files use the same video material. that means the audio track \
should be same lenght. which then means if you have a contant bitrate, the two .mpg \
files should have the same size if i -dumpaudio both files the resulting dumpfiles \
are different in size... which i find strange, because the two .mpg files are synced \
to the video

> do the mplayer masters have any more idea i can try?
> 

I can only imagine that maybe one of the audio tracks starts a bit later or \
something. how can I make mplayer/mencoder fill that beginning with zero bytes?




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