Re: [MMUSIC] What is an m-line?

Martin Thomson <martin.thomson@gmail.com> Thu, 16 May 2013 16:36 UTC

Return-Path: <martin.thomson@gmail.com>
X-Original-To: mmusic@ietfa.amsl.com
Delivered-To: mmusic@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6A4D221F8F3E for <mmusic@ietfa.amsl.com>; Thu, 16 May 2013 09:36:01 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.6
X-Spam-Level:
X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, NO_RELAYS=-0.001]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0fbBdiLUfIRZ for <mmusic@ietfa.amsl.com>; Thu, 16 May 2013 09:36:01 -0700 (PDT)
Received: from mail-we0-x229.google.com (mail-we0-x229.google.com [IPv6:2a00:1450:400c:c03::229]) by ietfa.amsl.com (Postfix) with ESMTP id B02FF21F898A for <mmusic@ietf.org>; Thu, 16 May 2013 09:36:00 -0700 (PDT)
Received: by mail-we0-f169.google.com with SMTP id x54so2907843wes.0 for <mmusic@ietf.org>; Thu, 16 May 2013 09:35:59 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=711rnUMyUoWIZr/zUHnIthK5X8uKefQaDYqzCcuzX1o=; b=mOBAI+laGAWNwsbMEbk8+b/XhHkygF4eBnLjFKBuF2g7MVttNXIKfjFdUuoQvSsJWQ 3BwAsuq/9OZO20OXqlxYeqT+c02fR4Q9AYJTlG9ckrjegt7befOklkkDzVx8NAU6Rv5S Gua8BTaZrvqYrE5tTBK85Ix3jrCzgYxhxQbGlnlUaorCEHmg2ACAuzwvgIK9g5TmM2iA GhZidj4EK+ePMg8ekQcJaFu/Qh1I4LO/EkBvS6r6HTia64LwVp1gZTBAH5dM2tv8lPhU Wx72K6ChhcVezLfbfPRmPOSxgfOrqYL97y+LhjBlcECUJXNh3je3pLMcTvTrUiCzGqfA syWQ==
MIME-Version: 1.0
X-Received: by 10.180.88.231 with SMTP id bj7mr26269667wib.5.1368722159875; Thu, 16 May 2013 09:35:59 -0700 (PDT)
Received: by 10.194.20.135 with HTTP; Thu, 16 May 2013 09:35:59 -0700 (PDT)
In-Reply-To: <BLU169-W743682718AEA906C0F3C2A93A20@phx.gbl>
References: <CABkgnnWPWMLEecfqksGJrWrqvsu44gts48igUiLyiVV0iPhwQQ@mail.gmail.com> <C5E08FE080ACFD4DAE31E4BDBF944EB1134E782F@xmb-aln-x02.cisco.com> <5193B1DB.2070308@alum.mit.edu> <1922EE35-127D-459C-AC7A-D2E98A0CDBA0@csperkins.org> <BLU169-W119163BAE68316B331EE12193A20@phx.gbl> <5193EA5C.7050905@alvestrand.no> <BLU169-W743682718AEA906C0F3C2A93A20@phx.gbl>
Date: Thu, 16 May 2013 09:35:59 -0700
Message-ID: <CABkgnnULK4Af+G4sg8Nnsa27v8wtB3fF3Ei2=x9Q7vDf+5Ak9Q@mail.gmail.com>
From: Martin Thomson <martin.thomson@gmail.com>
To: Bernard Aboba <bernard_aboba@hotmail.com>
Content-Type: text/plain; charset="UTF-8"
Cc: "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] What is an m-line?
X-BeenThere: mmusic@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Multiparty Multimedia Session Control Working Group <mmusic.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mmusic>, <mailto:mmusic-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/mmusic>
List-Post: <mailto:mmusic@ietf.org>
List-Help: <mailto:mmusic-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mmusic>, <mailto:mmusic-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 16 May 2013 16:36:01 -0000

On 15 May 2013 15:43, Bernard Aboba <bernard_aboba@hotmail.com> wrote:
> Harald finally said:
>
> "I see the idea that *any application* should produce SDP that's useful in
> such a scenario as an illusion, and pursuing that illusion is just going to
> hurt us."
>
> [BA] Agree. s/illusion/delusion/ :)

I think that is a perfectly pragmatic conclusion to reach.  However,
it still leaves the issue open.  I'd like to at least reach a point
where there is agreement on just one model for interpreting the SDP
that is output and input to the WebRTC API.

If we have multiple interpretations, then we still need to reach
consensus on which one is the one we want to use.  That's a whole lot
harder if that is not "the one true interpretation", because someone
wont get what they want.

--Martin

p.s., It's been a long time, and I've been suppressing the urge, but I
can't help but think that Comment 22 is appropriate at this moment.