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Re: Use of PCM and Vorbis in the Mobile Profile of SMIL 3.0

From: Thierry Michel <tmichel@w3.org>
Date: Sun, 12 Aug 2007 20:01:37 +0200
Message-ID: <46BF4B01.7070303@w3.org>
To: Philippe Le Hegaret <plh@w3.org>
CC: www-smil@w3.org, Ivo Emanuel Gonçalves <justivo@gmail.com>, Dominique Hazael-Massieux <dom@w3.org>

Philippe Le Hegaret

Is your comment a formal last call comment to be processed by the SYMM WG ?

Thierry.


  wrote:
> 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.
> 
> 
Received on Sunday, 12 August 2007 18:01:46 UTC

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