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Re: 3GPP-T-WG3 codecs

From: Henning Timcke <henning.timcke@my.werft22.com>
Date: Mon, 11 Dec 2000 21:45:48 +0100
Message-Id: <200012112045.VAA23974@guardian.aart.ch>
To: geoff freed <geoff_freed@wgbh.org>
Cc: Henning Timcke <henning.timcke@werft22.com>
Cc: Tammy Kohl <tkohl@contextmedia.com>
Cc: <www-smil-request@w3.org>
Cc: Philipp Hoschka <ph@w3.org>
Cc: <www-smil@w3.org>
Hi all
I really think we should start an RFC on this topic.
It's not only a question of which formats should be part of a minmal set,
it's also a question what kind of topology in terms of bandwidth's QoS is
available for delivery of contents.
regards
Henning
Werft22
Am Mon Dec 11 19:37:23 2000 schrieb geoff freed <geoff_freed@wgbh.org>
 >Shouldn't there also be a text MIME type?
 >Geoff Freed
 >National Center for Accessible Media
 >WGBH Educational Foundation
 >geoff_freed@wgbh.org
 >On Friday, December 8, 2000, Tammy Kohl <tkohl@contextmedia.com> wrote:
 >>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
 >>>
 >>> ----------------
 >>> Ideen Werft22 GmbH
 >>>
 >>> Stadtturmstrasse 5 und 19
 >>> CH 5400 Baden
 >>> Telefon 056 204 29 13
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 >>> http://www.werft22.com
 >>>
 >>> Labor für Datenarchitektur
 >>> Telefon 056 210 91 32
 >>> Telefax 056 210 91 34
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 >>>
 >>> Henning Timcke
 >>>
 >>> Streaming Live with Linux by Ideen Werft 22 GmbH:
 >>> http://bahnhof.baden.ch
 >>>
 >>> 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.
 >>> >

--
Henning Timcke <henning.timcke@my.werft22.com>
Received on Monday, 11 December 2000 15:46:21 UTC

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