[mythtv-users] Language on ripped dvd -- transcode -a switch

Ryan Steffes rbsteffes at gmail.com
Tue Aug 16 13:52:04 UTC 2005

On 8/16/05, Allan Wilson <allanwilson at gmail.com> wrote:
> Just to make sure I wasn't crazy I just ran mplayer from the command line 
> with the following command:
>  mplayer -ao null -vo null -v BAD\ BOYS\ II.vob
> and it saw what looks like to me 3 audio channels.
> Searching demuxer type for filename BAD BOYS II.vob ext: .vob
> Trying demuxer 2 based on filename extension
> system stream synced at 0xD (0)!
> ==> Found video stream: 0
> ==> Found audio stream: 129
> ==> Found audio stream: 128
> MPEG Stream reached EOF
> ds_fill_buffer: EOF reached (stream: video)
> MPEG-PS file format detected.
> Any ideas?
> On 8/15/05, Allan Wilson <allanwilson at gmail.com> wrote:
> > 
> > I am confused I was just doing some reading on transcode to see why the 
> > developers chose it over mencoder and came across the flag that selects the 
> > audio track to record. Below is an example of using transcode from the 
> > command line:
> > 
> > transcode -i /space/tng-biggoodbye/vob/004 -w 4357,250,100 -a 1 -b 
> > 128,0,0 -s 3.311 -V -f 25 -B 12,10,8 -R 1 -x vob,null -o /dev/null -y 
> > xvidcvs,null
> > 
> > Next is a copy of the audio track that is being used:
> > 
> > -a 1 selects audio track number 1 (starting with 0).
> > 
> > Is it possible that it is just grabbing the wrong audio track? I am 
> > thinking no because although Ryan you said that once you rip a movie you are 
> > stuck with that audio track, when I run the vob file from the command line 
> > using mplayer I can see where it has 3 audio tracks 0, 129, and 128. I am 
> > guessing that it is choosing 129 b/c it is in front of the 128 and the -aid 
> > 128 flag would fix this but it didn't. Any ideas I refuse to give up. I was 
> > able to rip about 70% of my movie collection and I would love to get the 
> > rest without having to do it by hand and if other people are having this 
> > problem maybe we can narrow it down to help the developers on this. Are they 
> > doing much work on this part of Myth? It seems kinda stable compared to 
> > other parts. Thanks for all the help so far and anyone else chime in if you 
> > have any ideas, at this point anything is helpful.
> > 
> > Allan
> > 
I should rephrase, once you transcode, you are stuck with that audio track 
unless you use a format like OGG that can allow multiple tracks. The VOB 
file is a container that is in (I think), the MPEG2/PS codec for region 1 
dvds. There are other DVD formats, however. When you rip the vob, you get 
all the other languages, and DVD perfect video, but you also get a 4-6GB 
file. You lose the languages, however, when you convert to a smaller file, 
and from that point on there's nothing you can do about it.

** This is the part I could be totally wrong on and am just going off 
observation **

It appears that the -a switch to transcode tells transcode to use the 
default audio track. It does not appear to be language specific. If the 
audio track happens to be the same language, and the language you want, you 
are good to go. However, there are DVDs where the default language is the 
director's commentary, and of course others that default to other languages. 
The most frustrating being those that appear to have the default language 
change between chapters.

It is possible that that you can set -a to the language track and fix this 
problem. I honestly don't know. I believe that mtd.log will contain the 
transcode line that it ran, you could try running it manually setting "-a 
128" and see if that works.
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