Re: [V3] Centralized conference media

Magnus Westerlund <magnus.westerlund@ericsson.com> Fri, 27 March 2020 22:35 UTC

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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "juberti=40google.com@dmarc.ietf.org" <juberti=40google.com@dmarc.ietf.org>, "fluffy@iii.ca" <fluffy@iii.ca>
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Thread-Topic: [V3] Centralized conference media
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Date: Fri, 27 Mar 2020 22:35:39 +0000
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Subject: Re: [V3] Centralized conference media
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Hi,

So yes, I think there are the aspect of the topology as well as how one handle
the media related controll messages, i.e. the equivalent of RTCP. For example
things like FIR, PAUSE/Resume. 

So, if one with RTCP terminating middleboxes means that the ID spaces are soley
locally that could be a choice. I will note that in some cases one still need to
have the complete set of media sources from all end-points in a conference be
identified at a specific point to point leg. Even if only a subset is currently
transmitted over this leg. There are both benefits and downsides I think of
using a local namespace and having each node translate these.

I will note that one may still need to have end-to-end identies on media ADUs if
one are going to have any end-to-end security. 

Cheers

Magnus Westerlund



On Fri, 2020-03-27 at 09:28 -0700, Justin Uberti wrote:
> I think Magnus is trying to establish the conference topology, which has
> ramifications on how we want to handle things like RTCP.
> 
> One strawman could be to focus on RTCP-terminating SFUs, i.e., cementing the
> notion that RIPT media flows are indeed point-to-point (i..e., client-to-SFU,
> as opposed to client-to-client1, client2, client3).
> 
> On Fri, Mar 27, 2020 at 9:11 AM Cullen Jennings <fluffy@iii.ca> wrote:
> > 
> > > On Mar 27, 2020, at 8:23 AM, Magnus Westerlund <
> > > magnus.westerlund=40ericsson.com@dmarc.ietf.org> wrote:
> > > 
> > > I am also very worried that if the model for the media transport is only
> > > point
> > > to point calls then we get something that will become obsolete or at least
> > > need
> > > hacks immediately. This thing need to support centralized conferences with
> > > cascaded or meshed central media nodes. So I think it is cruical that one
> > > define
> > > the usage model with switched central nodes and have that in mind so that
> > > one
> > > can actually support the applications needed. I think by defining a strict
> > > model
> > > one can actually avoid a lot of feature creep in the media transport. 
> > 
> > I think it does make sense to support some meta data on a media flow for
> > centralized conferencing support. What semantic level information do you
> > think is needed in the media ?
> > 
> > 
> > 
> > -- 
> > V3 mailing list
> > V3@ietf.org
> > https://www.ietf.org/mailman/listinfo/v3
-- 
Cheers

Magnus Westerlund 


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