Re: [XCON] Common-data-model -- video-layout

[Lorenzo Miniero <lorenzo.miniero at unina.it>]

Hi Krishna,

you can define a video layout per video stream, which is different  
than per conference. In fact, you can have more mixes in the same  
conference. You can have more <entry> elements in <available-media>,  
each of whom may have a different <video-layout> if it's a video  
stream. Which participant should be attached to which stream can be  
defined in the data model as well.

Lorenzo


Quoting Krishna Prasad Kalluri <krishna.prasad.kalluri at ericsson.com>:

> Hi Lorenzo,
>
> How do define a layout per video stream? As I understood its possible to
> define a video layout per mix (conference)
>
> Regards
> Krishna
>
> -----Original Message-----
> From: Lorenzo Miniero [mailto:lorenzo.miniero at unina.it]
> Sent: den 24 november 2008 12:07
> To: Krishna Prasad Kalluri
> Cc: xcon at ietf.org
> Subject: Re: [XCON] Common-data-model -- video-layout
>
> Hi Krishna,
>
> you can still achieve what you want, by defining more video output
> streams with different layouts, and attaching participants to them
> according to your needs (e.g. a lightweight stream for all mobile users,
> and a heavier stream for others). It's not as straightforward as having
> a custom layout for each user, but it's compliant, for instance, with
> how videomixing is currently handled in the MEDIACTRL mixer package.
>
> Lorenzo
>
>
> Quoting Krishna Prasad Kalluri <krishna.prasad.kalluri at ericsson.com>:
>
> > Hi,
> >
> > I have a question related to the video-layout element in XCON common
> > data model.
> >
> > Question 1:
> >
> > The video-layout element is defined in the conference description
> level.
> > So one video conference will have only one layout. That means
> >
> > 1) From the conference mixer point of view its only one output mix.
> > 2) All participants view the same layout.
> >
> > Is my understanding correct? If so the video-layout description in
> > common-data-model is giving a different impression. From the text
> > below I got an impression that each participant can have different
> layout.
> > The <video-layout> element is used in conjunction with a video stream
> > to specify how the video streams (of participants) are viewed by each
> > participant.  Only one layout type can be specified for each output
> > stream
> >
> > Question 2:
> >
> > In the data model is it possible to include video-layout per
> > participant. May be its correct to say per endpoint. If the display of
>
> > endpoint is small (mobile phone) a participant can select a smaller
> > layout (Eg: dual-view) . If the endpoint display is large (pc) a
> > participant can select a bigger layout. Of course this causes more
> > processing in the mixer to generate several output mixes.
> >
> > In H.248.19 it is possible to specify one layout type per termination.
> >
> > So in the data model I like to propose to add
> >
> > Users->user->endpoint->controls->video-layout
> >
> > Any way the summary is I like to see layout per participant (endpoint)
> >
> > Regards
> > Krishna
>
>
>
> --
> Lorenzo Miniero, Junior Researcher
> Dipartimento di Informatica e Sistemistica Universita' degli Studi di
> Napoli "Federico II"
> Via Claudio 21 -- 80125 Napoli (Italy)
> Phone: +390817683821 - Fax: +390817683816
> Email: lorenzo.miniero at unina.it



--
Lorenzo Miniero, Junior Researcher
Dipartimento di Informatica e Sistemistica
Universita' degli Studi di Napoli "Federico II"
Via Claudio 21 -- 80125 Napoli (Italy)
Phone: +390817683821 - Fax: +390817683816
Email: lorenzo.miniero at unina.it
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