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Re: preparation of working draft as outlined by Raphael

From: RaphaŽl Troncy <Raphael.Troncy@cwi.nl>
Date: Wed, 22 Oct 2008 11:49:44 +0200
Message-ID: <48FEF738.5020608@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,

>   for mpeg21 in 
> http://www.w3.org/2008/WebVideo/Fragments/wiki/Existing_Technologies_Survey you 
> might use the following references:
> - http://www.chiariglione.org/mpeg/technologies/mp21-fid/index.htm.htm
> - 
> http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-21_schema_files/fid/ 
> These are the two assets which are publicly available for ISO/IEC 21000-17.

Thanks a lot for these pointers.

During our face to face meeting the last 2 days, we wondered how often 
the MPEG-21, Part 17 is practically used. More precisely:
   - Are you aware of any client-side application that can dereference 
what occurs after the '#' in the URI as it is defined by the Part 17. 
For example, how many applications can parse 
? or http://www.example.com/myfile.mp4#mp(~region(rect(20,20,40,40)))?
   - Do you have any ideas of how many applications make use of this URI 
scheme? Are we likely to find such URIs on the Web?
   - Is the defined scheme only applicable over the http protocol, or 
can it be applied on top of other protocols?
   - It seems to us that the Part 17 of the MPEG-21 does not specify any 
particular communication between the UA and the server, which means that 
  a UA always request the full resource to the server, that the server 
sends back the whole resource (a complete movie or audio file) and then 
the UA plays the fragment. Is it the intended case? Has the working 
group, that has specified the Part 17, consider to specify 
communications between UA and servers that will have as consequence of 
not serving the complete resource?

Will you be able to reply to the technical questions me might have 
regarding the URI schemes defined? Or could you point us towards the 
editors of this part?


RaphaŽl Troncy
CWI (Centre for Mathematics and Computer Science),
Kruislaan 413, 1098 SJ 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 Wednesday, 22 October 2008 09:50:54 UTC

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