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Re: [rtcweb] Plan A, respun

"Roni Even" <ron.even.tlv@gmail.com> Mon, 20 May 2013 13:45 UTC

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From: Roni Even <ron.even.tlv@gmail.com>
To: 'Adam Roach' <adam@nostrum.com>, 'Emil Ivov' <emcho@jitsi.org>
References: <51894846.3090102@nostrum.com> <518A304A.1030609@alvestrand.no> <518F6338.8070903@jitsi.org> <518F83E5.4060209@alvestrand.no> <519519DB.6050702@nostrum.com> <519524EA.3000509@alvestrand.no> <51952860.5030906@nostrum.com> <5195304B.10706@alvestrand.no> <CABcZeBO+miF-euyyKFDrpMUdnV-Ej2QaZgKmiMc2Yp08QUyz7A@mail.gmail.com> <5195CEDF.9040109@alvestrand.no> <CABcZeBPt_GL2pU6RrgQ91XCW-Xyn8dyuxSTE0icGu9Yd_GPgYA@mail.gmail.com> <5196460B.9000808@jitsi.org> <CABcZeBNA0+D_Kq=yGZQu-rrqks6C2v=GjJDYbKLA_+u8+w8AcQ@mail.gmail.com> <519654A5.1050406@jitsi.org> <5199F10B.5030102@nostrum.com>
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Date: Mon, 20 May 2013 16:44:41 +0300
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Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] Plan A, respun
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-----Original Message-----
From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of
Adam Roach
Sent: 20 May, 2013 12:47 PM
To: Emil Ivov
Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] Plan A, respun

On 5/18/13 00:02, Emil Ivov wrote:
>
> On 17.05.13, 18:08, Eric Rescorla wrote:
>> On Fri, May 17, 2013 at 8:00 AM, Emil Ivov <emcho@jitsi.org 
>> <mailto:emcho@jitsi.org>> wrote:
>>
>>
>>      On 17.05.13, 16:07, Eric Rescorla wrote:=line.
>>
>>
>>      > then presumably you need to follow this rule to ensure interop,
no?
>>
>>      Therefore, the interop part with the "many" endpoints seems to be
>>      covered already. One still needs to find ways of handling and
>>      potentially gatewaying ICE and SRTP for many of them but that's a
>>      different matter. O/A-wise we seem to have consensus on how to do
the
>>      case with the two m= lines that each carry one track.
>>
>>      It seems to me that we have now moved beyond that.
>>
>>
>> The question is how an endpoint which wishes fo offer more than one 
>> audio and one video does so in a way that doesn't cause older 
>> endpoints to choke.
> I might be misunderstanding or missing something, but isn't it clear 
> that, if you are trying not to choke anyone, the first thing to do 
> would be to stick to a single m= line for audio and a single m= line for
video?
>

>Not if you're talking to a device that expects three media streams -- such
things have historically used three m=video sections (one for each stream).
Which >is kind of the reason we're specifying Plan A the way we are.

When a device offers three video m-lines and the other EP can receive only
one there is no interoperability specified and this will be a more common
case.


/a
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