[whatwg] Give guidance about RFC 4281 codecs parameter
singer at apple.com
Mon Apr 9 12:07:22 PDT 2007
At 11:59 -0700 9/04/07, Charles Iliya Krempeaux wrote:
>On 4/9/07, Dave Singer <<mailto:singer at apple.com>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...
>* * * * *
>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
>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.
>> * Dirac video and Vorbis audio in Matroska container.
>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
so a defined 'codecs' parameter might be prudent, perhaps. Thanks
for the correction.
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