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[whatwg] Give guidance about RFC 4281 codecs parameter

From: Charles Iliya Krempeaux <supercanadian@gmail.com>
Date: Mon, 9 Apr 2007 11:59:22 -0700
Message-ID: <84ce626f0704091159m5ed01138lb61dc7d9cfcf64f4@mail.gmail.com>
Hello,

On 4/9/07, Dave Singer <singer at apple.com> wrote:
>
>  WARNING:  I have CC'd the co-authors of the RFC, as I think they might
> like to see the discussion, comment on my answers, and possibly correct me.
> I also have a question whether there is a typo in the RFC...
>
> * * * * *
>
>
> Henry
>
> these are all great questions.  Let me see how many I can answer.
>
> Overall, the RFC was struggling with the issue that there is no 'uniform'
> naming of codecs;  the namespace for codecs is dependent on the container
> format, so products that do container conversion have to have tables of code
> matches.  ugh.  That's why the RFC is as it is.
>
> The RFC suggests that updated information would be done with RFCs, which
> is a little heavy.  The RFC as written formally applies to 3GPP files and
> 3GPP2 files, but the definitions are applicable for all ISO-family files.
>
> As you'll see below, 3GPP has also defined it for avc1 in MP4-family
> containers, but no spec. or registration authority provides a pointer.  We
> might want to ask IANA whether we could add something to the MIME registry.
>
>
> At 11:37  +0300 8/04/07, Henri Sivonen wrote:
>
>
>  * Theora video and Vorbis audio in Ogg container. (application/ogg; .ogg)
>  * Dirac video and Vorbis audio in Ogg container. (application/ogg; .ogg)
>  * Theora video and Vorbis audio in Matroska container. (video/x-matroska;
> .mkv)
>  * Dirac video and Vorbis audio in Matroska container. (video/x-matroska;
> .mkv)
>
>
> My understanding is that the Ogg container is 'specific' to these codecs,
> and therefore the codecs parameter is not needed.  But I am not an Ogg or
> Matroska expert;  perhaps they could chime in?
>

No.  The containers are independent of the codecs put inside.

However, whether software, that supports Ogg or Matroska containers will
actually be able to "play" other codecs is another issue altogether.

[...]


See ya


-- 
    Charles Iliya Krempeaux, B.Sc.

    charles @ reptile.ca
    supercanadian @ gmail.com

    developer weblog: http://ChangeLog.ca/
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