[mythtv-users] MPEG4 transcode - lost subtitles and additional audio tracks

Robin Hill myth at robinhill.me.uk
Thu Mar 29 08:20:51 UTC 2007


On Thu Mar 29, 2007 at 06:04:21PM +1000, Bill Williamson wrote:

> On 3/29/07, Joan VallÚs <joan.valles at gmail.com> wrote:
> >
> > > Audio track wise its probably converting to whatever you told your
> > transcoder to convert the audio to (MP3 perhaps?).  There is no option in
> > mythtv to allow audio pass through and only transcode the video.  If you
> > want that you'll have to setup a userjob and do external transcoding where
> > you configure exactly what conversions should happen.
> >
> > Yes audio is converted to MP3, but that's not the problem, I'd like to know
> > if there is a way to tell the transcoder to convert all the audio tracks and
> > not only the first one.
> >
> > At this point I think I should ask first if MPEG-4 allows more than one
> > audio stream and also, if mythtv can switch between them...
> >
> 
> 
> MPEG-4 is a video compression codec, not a container.  MKV (which
> mythtv has horrible support for) supports multiple audio streams and
> multiple subtitle streams.  AVI does not officially support multiple
> audio streams, but has been "unofficially extended" to allow for it.
> 
Actually, MPEG-4 is also a container (usually using the .mp4 extension)
and can contain multiple audio streams.  I don't think these are what
Myth is using though - there's not much in the way of tools for
creating/using MPEG-4 containers.

Cheers,
        Robin

-- 
     ___        
    ( ' }     |       Robin Hill        <myth at robinhill.me.uk>  |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |
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