[theora-dev] Ogg questions

Silvia.Pfeiffer at csiro.au Silvia.Pfeiffer at csiro.au
Mon Jan 6 11:09:50 PST 2003

Hi Arc,

thanks a lot for pointing out these errors (damned, the mix-up of tarkin
and VP3 slipped in there as well). I have corrected them as follows for
the next submission to IETF:

> Arc wrote:
> > 2) an I-D describing the "Ogg file format" written by me:
> >
> > http://www.ietf.org/internet-drafts/draft-pfeiffer-ogg-fileformat-00.txt
> There's atleast one error in this document:
>    Ogg Theora encapsulates a Vorbis-encoded audio bitstream and a
>    Tarkin-encoded video bitstream in a single physical Ogg bitstream.
> That's incorrect.  Tarkin is a completely different codec, Theroa is
> based on VP3.  Also, I do not believe that Theora encapsulates the
> Vorbis, but that they exist as concurrent, synced chains within Ogg.
> Monty would know more about this, as I have done very little studying
> of the Theora format.

    Ogg Theora multiplexes a Vorbis-encoded audio
    bitstream and a VP3-encoded video bitstream in a single
    physical Ogg bitstream.

<p>> Also, if Monty would care to clairify...
>    Ogg Vorbis puts a further constraint onto Ogg by specifying that
>    concurrent multiplexing is not allowed in Ogg Vorbis files.
> Is this true?  I've been wondering about this.

    I've deleted this part as it is not relevant to this standard and in
    fact introduces a dependency to a different specification which is
    better avoided.

<p>Thanks again,

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