Re: [MMUSIC] Displaying side by side video streams draft-jennings-mmusic-adjacent-grouping

Thanks Roni - good point. Comments inline....

On Sep 22, 2010, at 5:46 PM, Roni Even wrote:

> Hi Cullen,
> I agree that it is a very trivial draft and have some value if the
> limitation are described. 
> Reading the draft I assume that when you say a screen it means a camera and
> a monitor pair. If this is not the case how do you signal this information
> (cameras and monitors)  and how does the answerer describes his topology if
> it is not the same as the offer, is it based on sendonly and recvonly offers
> and answers.

Tried to clear that up a bit - I had the text sort of wrong. When SDP goes from A to B, regardless of if it is an offer or answer, the SDP should indicate what the preferred adjacency grouping is of the media that A will send to B. 

> 
> It will work well in a symmetrical case, I am not sure about the other
> cases. For example if the offer has three cameras (and three monitors) and
> the other side has two screens by selecting two in the answer he will only
> get two of the streams. What if he wants to switch between the streams
> watching different ones, will it require a re-invite or will he answer with
> the three streams and switch to the display the ones he wants to display at
> the moment.

It would allow either of the above behaviors thought neither of them are the ideal solution for cases with rapid switching. Clearly the re-invite is not exactly the fast way to switch and the sending 3 streams when you are only displaying 2 is a waste of bandwidth. I don't think this draft is really trying to take on the problems of the fast switching though I hope some other draft does. 

> 
> 
> Roni Even
> 
>> -----Original Message-----
>> From: mmusic-bounces@ietf.org [mailto:mmusic-bounces@ietf.org] On
>> Behalf Of Cullen Jennings
>> Sent: Tuesday, September 21, 2010 9:49 PM
>> To: MMUSIC WG
>> Subject: [MMUSIC] Displaying side by side video streams draft-jennings-
>> mmusic-adjacent-grouping
>> 
>> 
>> I just submitted a draft on using the SDP grouping framework to
>> indicate when multiple media streams should be rendered side by side.
>> It a pretty trivial draft but I'd love to get some comments on it.
>> 
>> http://www.ietf.org/id/draft-jennings-mmusic-adjacent-grouping-00.txt
>> 
>> Thanks, Cullen
>> 
>> 
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> 