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Proposed text to close ISSUE-2

From: RaphaŽl Troncy <Raphael.Troncy@cwi.nl>
Date: Thu, 12 Feb 2009 14:22:15 +0100
Message-ID: <49942287.3030203@cwi.nl>
To: Media Fragment <public-media-fragment@w3.org>

Dear all,

I have suggested this week telecon to close the ISSUE-2: "What is the 
mime type of a media fragment? What is its relation with its parent 
resource?" [1].

My proposed text summarizing the discussion thread concerning this issue is:

"The mime type of a media fragment is the *same* mime time of its parent 
resource. Hence, a media fragment addressing a single frame of a video 
would be of mime type video. If the media format constrains the 
playability of such resource (e.g. MP4 or 3GP explicitly forbid to have 
video with a zero duration), then the selection of this fragment will 
fail. In other words, media fragment URI are bound to the limitations of 
the underlying coding and container formats."

Please, let me know in case I have *not* correctly captured what the 
group consensus is about this issue.

Finally, as a side issue, we have also discussed whether media fragments 
should be defined only for information resources (i.e. concrete 
representations of a resource) or could also be defined for 
non-information resources (i.e. things that can have multiple 
representations). The WG charter [2] says:

"This group is chartered to provide URI-based mechanisms for uniquely 
identifying temporal and spatial fragments for media objects in the Web, 
such as video, audio, and images."

I interpret this sentence as "media objects = information resources" and 
*not* any resources (in the sense of the httpRange-14 resolution [3,4]). 
Would you agree with my interpretation of the charter?
Best regards.


[1] http://www.w3.org/2008/WebVideo/Fragments/tracker/issues/2
[2] http://www.w3.org/2008/01/media-fragments-wg.html
[3] http://lists.w3.org/Archives/Public/www-tag/2005Jun/0039.html
[4] http://www.w3.org/TR/cooluris/

RaphaŽl Troncy
CWI (Centre for Mathematics and Computer Science),
Science Park 123, 1098 XG Amsterdam, The Netherlands
e-mail: raphael.troncy@cwi.nl & raphael.troncy@gmail.com
Tel: +31 (0)20 - 592 4093
Fax: +31 (0)20 - 592 4312
Web: http://www.cwi.nl/~troncy/
Received on Thursday, 12 February 2009 13:23:38 UTC

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