ogg dev - Jan 2008 - How to embede text into the Ogg stream

Hi Folks,

What is the proper way to embed text stream into the Ogg stream? I need to have
text information (lyrics as example) recorded together with the audio. Is there
a standard mechanism for that? What is the right way to do it?

  With best regards,
    Boian Mitov

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On Thu, Jan 10, 2008 at 10:20:51AM -0800, Boian Mitov wrote:
> What is the proper way to embed text stream into the Ogg stream? I need to
have text information (lyrics as example) recorded together with the audio. Is
there a standard mechanism for that? What is the right way to do it?
There's no standard way to do that. Some people embed lyrics wholesale 
in a vorbis comment tag. "LYRICS=line 1\nline2\n..." This has the 
advantage of working with older audio-only players.

A better way is to put the text in its own stream and multiplex it with 
the audio. Especially if the text has a time index or is generated on
the fly, in parallel with the audio. There have been a couple of 
proposals for this; the most popular one right now is to use the 
<description> or <caption> tags inside an CMML stream.

  https://svn.annodex.net/standards/draft-pfeiffer-cmml-current.txt

We would like to get this standardized, so let us know how it goes.

 -r

On 1/10/08, Ralph Giles <giles@xiph.org> wrote:
> There have been a couple of
> proposals for this; the most popular one right now is to use the
> <description> or <caption> tags inside an CMML stream.
>
> We would like to get this standardized, so let us know how it goes.
I think we are likely to settle for CMML for everything text in Ogg.
Of course, semantically-wise and to avoid confusing players, we should
make clear when to use <description> and when to use <caption>.  For
instance, I'm pretty sure <caption> should only be used for subtitles
and lyrics, which would leave <description> likely for metadata only.

Perhaps going as far as create one or two video (Theora) example files
with subtitles for a test suite would be a step in the right
direction.  Without testcase files it's unlikely we'll see any support
on third-party tools and we need that support.

That said, I'm currently not sure how to embed CMML in Ogg.  Does
oggzmerge do it?

-Ivo