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Re: 3GPP-T-WG3 codecs

From: geoff freed <geoff_freed@wgbh.org>
Date: 11 Dec 2000 14:37:23 -0400
Message-ID: <-1235577056geoff_freed@wgbh.org>
To: Henning Timcke <henning.timcke@werft22.com>, Tammy Kohl <tkohl@contextmedia.com>, <www-smil-request@w3.org>
CC: Philipp Hoschka <ph@w3.org>, <www-smil@w3.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
>>
>> ----------------
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>>
>> Henning Timcke
>>
>> Streaming Live with Linux by Ideen Werft 22 GmbH:
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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.
>> >
Received on Monday, 11 December 2000 14:37:28 UTC

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