Re: [Thoggen-devel] Problems with merging streams and bad headers in video stream

[Tim <t....@ze...>]

On Sat, 2007-03-10 at 23:56 +0100, fake168 wrote:

Hi,

(forwarded from thoggen-cvs, which is for commits, not discussions; this
has only been discussed in the bug tracker; forwarding it since the
merging stuff may be of interest to others).

> I love your work on Thoggen. Thanks a lot - it's a great program and 
> very easy to use.
> 
> However, I do have a problem. I got an ogg file (video and audio) from a 
> DVD. Fine. But I'd like to have that ogm with two audio streams (english 
> and my native language). Unfortunately Thoggen doesn't apply to my 
> needs. Okay, doesn't matter. So I decided to let Thoggen run over the 
> DVD again - now in my native language. Fine again. Now I tried to 
> extract that audio stream from the second ogm and to merge it with the 
> first ogm. Ooops, there the problems start.
> 
> First I tried to open the ogms with VirtualDubMod. It crashs and says 
> something about division through zero. Okay, okay. So I tried to use 
> ogmdemux and ogmmerge. But all ogmtools are mentioning a bad header 
> reffering to the video stream. In the end I can get only a merge which 
> inlcudes both languages, but not a video stream. :(
> 
> Now it seems to me, that something has to be wrong with the video 
> stream. I can't dump it via mplayer -dumpstream oder -dumpvideo. I can't 
> extract it via ogmdemux. I can't even open it with VirtualDubMod.
> 
> Surprisingly it opens with xine and mplayer. Playing the ogms is no 
> problem at all. I have spent several hours on this matter, but I 
> couldn't solve this problem.

OGG and OGM are different things at the stream level. Tools that are
made for OGM streams in particular (like ogm*) are probably geared
towards OGM streams and less likely to work with 'normal' ogg streams
such as the ones produced by Thoggen. A quick look at google seems to
suggest that VirtualDubMod can only handle Theora-in-ogm, but not
'normal' Theora. I don't really know anything about any of these tools,
but I'm guessing that they're all made for OGM streams only.

I don't think there's anything wrong with the output produced by
Thoggen. If so, oggz-validate should probably reveal it.


As for the remuxing two .ogg files into one single .ogg file, that
should be fairly easy to do. I've added a gst-launch-0.10 example
pipeline to the FAQ on the website. It goes like this:

gst-launch-0.10 oggmux name=mux ! filesink location=film.ogg \
filesrc location=film-de-audio.ogg ! oggdemux name=d1        \
filesrc location=film-es-audio.ogg ! oggdemux name=d2        \
d1. ! queue ! theoraparse ! mux.                             \
d1. ! queue ! vorbisparse ! mux.                             \
d2. ! queue ! vorbisparse ! mux.

This will combine the video and audio streams from the first file with
the audio stream from the second file (best to use recent GStreamer
core/base versions for this).

 Cheers
  -Tim