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Re: ACTION-76 : Question if MPEG-21 Part 17 got registered on IANA as a media mime type for fragments

From: RaphaŽl Troncy <Raphael.Troncy@cwi.nl>
Date: Thu, 27 Aug 2009 15:07:26 +0200
Message-ID: <4A96850E.5060908@cwi.nl>
To: "Christian Timmerer (ITEC)" <christian.timmerer@itec.uni-klu.ac.at>
CC: Silvia Pfeiffer <silviapfeiffer1@gmail.com>, Media Fragment <public-media-fragment@w3.org>
Dear Christian,

>   First of all, I don't have any objections as long as it serves the 
> purpose. However, it would be nice to have the reasons for not adopting 
> existing other standards (such as MPEG-21 FID) somewhere documented on 
> the wiki.

I fully agree. Our documents are still in an early stage, but indeed, 
the reason why we did this technological survey is for assessing what 
schemes already exist and why we need to develop Media Fragments. In a 
nutshell, because there is a need coming from use cases, because there 
are ad-hoc solutions currently deployed on the web but not standardized 
(ŗ la Google), because there are standardized (or half-standardized) 
schemes but not really deployed (and we want to better understand why 
FID has never take off, too complex?), etc.

> Btw. in the current draft on Media Fragments URI I wonder whether 
> there's any difference between a segment and a fragment.

Good question! I admit this is poorly documented currently. The idea is 
that a segment is the abstract notion. Extracting a segment from a media 
could become a fragment if done in-context (i.e. using the #) or could 
become a entire new resource (i.e. using the ?) if done out-of-context 
which can still be linked to its parent resource.

We will better document that in our 2nd round of publication, hopefully 
coming in one month.


RaphaŽl Troncy
EURECOM, Multimedia Communications Department
2229, route des CrÍtes, 06560 Sophia Antipolis, France.
e-mail: raphael.troncy@eurecom.fr & raphael.troncy@gmail.com
Tel: +33 (0)4 - 9300 8242
Fax: +33 (0)4 - 9000 8200
Web: http://www.cwi.nl/~troncy/
Received on Thursday, 27 August 2009 13:08:20 UTC

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