Re: Use of PCM and Vorbis in the Mobile Profile of SMIL 3.0 ( LC-1802)

 Dear Philippe Le Hegaret ,

The SYMM Working Group has reviewed the comments you sent [1] on the Last
Call Working Draft [2] of the Synchronized Multimedia Integration Language
(SMIL 3.0) published on 13 Jul 2007. Thank you for having taken the time to
review the document and to send us comments!

The Working Group's response to your comment is included below.

Please review it carefully and let us know by email at www-smil@w3.org if
you agree with it or not before 02 nov 2007. In case of disagreement, you
are requested to provide a specific solution for or a path to a consensus
with the Working Group. If such a consensus cannot be achieved, you will
be given the opportunity to raise a formal objection which will then be
reviewed by the Director during the transition of this document to the
next stage in the W3C Recommendation Track.

Thanks,

For the SYMM Working Group,
Thierry Michel
W3C Staff Contact

 1. http://www.w3.org/mid/1186761033.14115.49.camel@localhost
 2. http://www.w3.org/TR/2007/WD-SMIL3-20070713/


=====

Your comment on 18. SMIL 3.0 Mobile Profile:
> Section "18.4.8 Required MIME Types", part of the SMIL 3.0 Mobile
> Profile, indicates:
> [[
>   * audio/basic [MIME-2]
>       * Ogg Vorbis [VORBIS]
>       * image/png [PNG-MIME], [PNG-REC]
>   * image/jpeg [MIME-2], [JFIF]
> ]]
>
http://www.w3.org/TR/2007/WD-SMIL3-20070713/smil-mobile-profile.html#q14
> 
> Requiring the use of PCM and Vorbis in the mobile environment might be
> difficult for two reasons:
> - it *seems* that Vorbis requires more CPU to be decoded than a format
> like AAC, thus rendering its use in a mobile environment more
> problematic.
> - 3GPP and 3GPP2 already adopted AAC as their audio codec (+ some AMR
> speech codecs). It's hard to imagine the mobile industry willing to
> switch to a different format now.
> 
> So, while I certainly don't want to suggest that the Mobile profile
> must
> require support for AAC, I wonder if the current proposal will be
> welcome by the Mobile industry...
> 
> Regards,
> 
> Philippe
> 
> PS: I'm copying Ivo Emanuel Gonçalves and Dominique Hazael-Massieux
> since they might have some input or comments.


Working Group Resolution (LC-1802):
Dear Philippe,

The SYMM Workgroup has agreed to accept your proposal.

The royalty-free codecs have been changed from "required" to
"recommended".

Thank you for your comments.

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Received on Sunday, 28 October 2007 17:50:43 UTC