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Re: 3GPP-T-WG3 codecs

From: Tammy Kohl <tkohl@contextmedia.com>
Date: Fri, 08 Dec 2000 07:12:04 -0500
Message-ID: <3A30D013.2363ACCC@contextmedia.com>
To: Henning Timcke <henning.timcke@werft22.com>
CC: Philipp Hoschka <ph@w3.org>, www-smil@w3.org
I agree.  Also, Real Media formats should be included in the list.

Tammy Kohl
tkohl@contextmedia.com


Henning Timcke wrote:

> Hi
> Choosing MPEG 4 among a  minimum set of supported formats really sounds
> like joke to me.
> Who should be a able to take advantage of this minimal set as of today ?
>
> > Suggested formats or codecs for media type Video:
> > - MPEG 4 (Visual Simple Profile, Level 1)
> > - ITU-T H.263
> > - Quicktime
>
> This would look more realistic to me:
>
> > Suggested formats or codecs for media type Video:
> > - MPX (MPEG-1, MPEG-2, MPEG 4)
> > - AVI
> > - Sure Stream (TM) RS G2
> > - Windows Media (TM)
> > - ITU-T H.263
> > - MOV Quicktime (TM)
>
> Regards
> Henning
>
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> Henning Timcke
>
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> Philipp Hoschka wrote:
> >
> > Patrick,
> >
> > 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 ?
> >
> > -Philipp
> >
> > > 3GPP-T-WG3 codecs
> > >
> > > From: Patrik Fältström (paf@cisco.com)
> > > Date: Thu, Nov 30 2000
> > >
> > > *Next message: Glenn Parsons: "RE: 3GPP-T-WG3 codecs"
> > >
> > >    * Previous message: Jacob Palme: "Language translation in e-mail"
> > >    * In reply to: Jacob Palme: "Language translation in e-mail"
> > >    * Next in thread: Glenn Parsons: "RE: 3GPP-T-WG3 codecs"
> > >    * Reply: Glenn Parsons: "RE: 3GPP-T-WG3 codecs"
> > >    * Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
> > >    * Other mail archives: [this mailing list] [other W3C mailing lists]
> > >    * Mail actions: [ respond to this message ] [ mail a new topic ]
> > >
> > >   ------------------------------------------------------------------------
> > >
> > > Message-Id: <p05100543b64c4580118a@[10.0.1.28]>
> > > Date: Thu, 30 Nov 2000 18:58:56 +0100
> > > To: discuss@apps.ietf.org
> > > From: Patrik Fältström  <paf@cisco.com>
> > > Subject: 3GPP-T-WG3 codecs
> > >
> > > I need people interested in the are of codecs. Can someone help with
> > > the following request?
> > >
> > > Let me know if you are interested (or know someone which are interested).
> > >
> > >     Patrik
> > >     Co-Area Director, Applications Area
> > >
> > > Date: Wednesday, 29 November, 2000 15:06 -0800
> > > From: "Leuca, Ileana" <ileana.leuca@attws.com>
> > > To: "'sob@harvard.edu'" <sob@harvard.edu>
> > > Subject: 3GPP-T-WG3 codecs
> > >
> > > Scott,
> > >
> > > the 3GPP-T2-WG3 defines the minimum set of supported formats for
> > > Multimedia Messaging Services.
> > >
> > > Please help to find an IETF person(s) to be included in the
> > > process of standardizing the minimum set of codex for audio,
> > > video and image types.
> > >
> > > In summary the following text is proposed today:
> > > ==========================================
> > > Multiple media elements shall be combined into a composite
> > > single MM using MIME multipart format as defined in RFC 2046
> > > [x]. The media type of a single MM element shall be identified
> > > by its appropriate MIME type whereas the media format shall be
> > > indicated by its appropriate MIME subtype.
> > >
> > > In order to guarantee a minimum support and compatibility
> > > between multimedia messaging capable terminals, the following
> > > media formats shall be at least supported.
> > >
> > > Suggested formats or codecs for media type Audio:
> > > - AMR / EFR; organised in octet format as specified in 3G TS
> > > 26.101 and 3G TS 26.101
> > > - MP3
> > > - MIDI
> > > - WAV
> > >
> > > Suggested formats or codecs for media type Image:
> > > - JPEG
> > > - GIF 89a .
> > >
> > > Suggested formats or codecs for media type Video:
> > > - MPEG 4 (Visual Simple Profile, Level 1)
> > > - ITU-T H.263
> > > - Quicktime
> > >
> > > Minimum set of supported media shall support type Text formats.
> > > Any character encoding (charset) that contains a subset of the
> > > logical characters in Unicode [7] shall be used (e.g. US-ASCII
> > > [8], ISO-8859-1[9], UTF-8[10], Shift_JIS, etc.).
> > > Unrecognised subtypes of "text" shall be treated as subtype
> > > "plain" as long as the MIME implementation knows how to handle
> > > the charset. Any other unrecognised subtype and unrecognised
> > > charset shall be treated as "application/octet - stream".
> > >
> > > ================================================================
> > > ============ ==
> > > thanks,
> > > ileana
> > >
> > > --
> > >
> > >   ------------------------------------------------------------------------
> > >
> > >    * Next message: Glenn Parsons: "RE: 3GPP-T-WG3 codecs"
> > >    * Previous message: Jacob Palme: "Language translation in e-mail"
> > >    * In reply to: Jacob Palme: "Language translation in e-mail"
> > >    * Next in thread: Glenn Parsons: "RE: 3GPP-T-WG3 codecs"
> > >    * Reply: Glenn Parsons: "RE: 3GPP-T-WG3 codecs"
> > >    * Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
> > >    * Other mail archives: [this mailing list] [other W3C mailing lists]
> > >    * Mail actions: [ respond to this message ] [ mail a new topic ]
Received on Friday, 8 December 2000 07:14:51 UTC

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