[Mp4-tech] scalable formats for PDA, PC, TV

[Cyril Concolato]

Hi Sven,
Sven Wontroba a écrit :
> List members,
> 
> 
> I'm a student writing my thesis about scalable formats for PDA's, PC, 
> TV,... 
> 
> So far I read a dif papers about MPEG4,7, SMIL, MPEG21,... and there is 
> one point I don't understand completely. With XMT-O and XMT-A it's 
> posible to describe complex sceens and create some interaction,... 
True.
> within MPEG4 but more precisely in the MPEG21 Idem Adaption, if I 
> understand everything correct I'm able to scale dif. object depending my 
> device, user specification,... 
The relationship between MPEG-4 and MPEG-21 is complex. But in summary, 
MPEG-4 describes the composition of the presentation while MPEG-21 
describes the treatment that you can apply to the presentation.
> The point where I'm stuck is, how do I transform my complex XMT 
> presentation into a MPEG21 presentation. 
The answer is you cannot. MPEG-21 is not a presentation language, it is 
not meant to be rendered. One could imagine the opposite: an XMT 
description created based on an MPEG-21 description.
> I found some application to create dims at the Klagenfurt University 
> Austria with some other helpful information. But may be there are other 
> information out there. So far I don't understand how to create a complex 
> presentation for one device as an abstract MPEG21 description.
> 
> Some hints may be to papers(ACM, IEEE, MPEG... ) or other project would 
> be helpful or may be a link to other lists with more information about 
> this problem.
The DANAE project (http://danae.rd.francetelecom.com) tackles some 
issues about MPEG-4 and MPEG-21. You can try to have a look.
Best regards,
Cyril Concolato
> 
> 
> Thanks Sven
> 
> 
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