[ogg-dev] Merging Ogg streams whilst updating the Skeleton?

[Silvia Pfeiffer]

What does oggz-info tell you about the file when you've merged it
(without skeleton)? It may say that there are two logical video
bitstreams, because they've come from different files. So, two
skeletons may actually be correct.

I hear that ffmpeg has a a concat feature. Not sure how it does it.

There's also OggCat
(http://en.flossmanuals.net/ogg-theora/command-line-editing/cat-files/).
However, you have to make sure that the video is encoded with the same
parameters (same resolution, audio encoding parameters).

Multiple skeletons are actually valid, so you should be able to deal with it!

HTH.

Cheers,
Silvia.


On Sat, Aug 23, 2014 at 3:54 AM, Nick Burch <ogg at gagravarr.org> wrote:
> Hi All
>
> I'm currently trying to put together an ogg file with two theora streams,
> a handful of audio streams (probably mixed vorbis and opus), and a
> Skeleton stream that describes their relationships to each other. I had
> hoped to be able to use the oggz suite of tools, but I can't seem to get
> that to work.
>
> To generate my theora files, I'm using ffmpeg2theora, which will happily
> generate me an ogg file with a single theora stream, and with or without a
> skeleton stream for it. If I generate two of them, without skeleton
> streams, and then use oggz-merge to splice them together, no skeleton
> stream is added. If I use oggz-merge on two both with theora+skeleton,
> then I end up with a file with two skeleton streams, both claiming to hold
> role=video/main, which doesn't seem correct to me. I can use oggz-merge to
> merge in the audio tracks too, but they don't show up in either skeleton,
> which seems wrong too.
>
> Can anyone suggest the best way to go about merging together these various
> streams, so I end up with a Skeleton stream properly describing how they
> fit together?
>
> And related - is the behaviour of oggz-merge when merging two
> skeleton-containing files to end up with a file with two skeleton streams
> correct, or should I report a bug for that?
>
> Thanks
> Nick
>
> PS I'm creating these multi-stream files to test the handling of
>     multi-stream files in the Ogg and Vorbis Java library I maintain, to
>     help check if the proposed Apache Tika multi-stream metadata proposal
>     will work, so I'm a long way down the rabbit hole here!
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