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RE: 3GPP-T-WG3 codecs

From: Philipp Hoschka <hoschka@yahoo.com>
Date: Tue, 12 Dec 2000 02:54:46 -0800 (PST)
Message-ID: <20001212105446.11318.qmail@web2303.mail.yahoo.com>
To: thierry michel <tmichel@w3.org>, www-smil@w3.org, discuss@apps.ietf.org
Cc: Glenn Parsons <gparsons@nortelnetworks.com>
The rationale for picking audio/basic was that it
is widely supported in SMIL players today, and doesn't
require paying a license fee.

If you know of another license-free, widely 
supported audio format with better 
characteristics than audio/basic, that may be
interesting.

--- thierry michel <tmichel@w3.org> wrote:
> RE: 3GPP-T-WG3 codecs
>   ----- Original Message ----- 
>   From: Glenn Parsons 
>   To: discuss@apps.ietf.org ; www-smil@w3.org ;
> 'Philipp Hoschka' 
>   Cc: 'IETF VPIM List' 
>   Sent: Monday, December 11, 2000 8:28 PM
>   Subject: [Moderator Action] RE: 3GPP-T-WG3 codecs
> 
> 
> 
> 
>   Philipp, I'd be interested in the rational that
> made you pick audio/basic 
> 
>     FWIW, there is a set of "recommended" codecs in
> the SMIL 2.0 
>     draft of W3C, and I'm happy to explain why we
> chose those, if 
>     needed: 
> 
>    
>
http://www.w3.org/TR/2000/WD-smil20-20000921/smil20-profile.html#BaselineFormatsNS
> 
> 
>     > Widely Supported MIME Types 
>     > 
>     >    This section is informative. 
>     > 
>     >    The members of the W3C SYMM Working Group
> believe that the following 
>     >    MIME types will be widely supported by SMIL
> players: 
>     >      * audio/basic [592][MIME-2] 
>     >      * image/png ([593][PNG-MIME],
> [594][PNG-REC]) 
>     >      * image/jpeg ([595][MIME-2], [596][JFIF])
> 
>     >    Implementers of SMIL players should thus
> strive to provide support for 
>     >    each of these types. Note, however, that
> this section is 
>     >    non-normative, and that support for these
> MIME types is not a 
>     >    precondition for conformance to this
> specification. 
>     > 
>     >    Authors are encouraged to encode media
> objects using one of the widely 
>     >    supported MIME types whenever possible.
> This will ensure that their 
>     >    SMIL documents can be played back by a wide
> range of SMIL players. 
>     > 
>     >    If authors use a MIME type that is not in
> the list of widely supported 
>     >    types, they should provide an alternative
> version encoded using a 
>     >    baseline format. This can be achieved by
> using a switch element as 
>     >    shown in the following example: 
>     > <switch> 
>     >   <audio src="non-baseline-format-object" /> 
>     >   <audio src="baseline-format-object" /> 
>     > </switch> 
>     > 
>     >    In this example, a player that supports the
> non-baseline format will 
>     >    play the first audio media object, and a
> player that does not support 
>     >    the non-baseline format will play the
> second media object. 
> 
>     In general, I'm a bit confused about the request
> - why would the 
>     IETF have to comment on the minimal set of
> codecs in a format 
>     defined by another organisation ? This would
> make sense if the 
>     goal is to define a minimal set of codecs that
> need to be supported 
>     by MIME mail readers, but otherwise, I don't see
> the point - am 
>     I missing something ? 
> 
>   I don't think the IETF _has_ to comment, we've
> just been asked.. 
> 
>   This is more about the codecs available on various
> devices.  Few if any mail clients have audio codecs
> included.  
> 
>   Cheers, 
>   Glenn. 
> 
> 


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Received on Tuesday, 12 December 2000 06:02:38 UTC

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