IETF Logo Mail Archive

Re: [rtcweb] draft-alvestrand-one-rtp-00.txt and profile

Colin Perkins <csp@csperkins.org> Mon, 22 August 2011 16:48 UTC

Return-Path: <csp@csperkins.org>
X-Original-To: rtcweb@ietfa.amsl.com
Delivered-To: rtcweb@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6D68B21F8BEC for <rtcweb@ietfa.amsl.com>; Mon, 22 Aug 2011 09:48:27 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -103.598
X-Spam-Level:
X-Spam-Status: No, score=-103.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100]
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 brUGMl+1KXSm for <rtcweb@ietfa.amsl.com>; Mon, 22 Aug 2011 09:48:26 -0700 (PDT)
Received: from anchor-msapost-1.mail.demon.net (anchor-msapost-1.mail.demon.net [195.173.77.164]) by ietfa.amsl.com (Postfix) with ESMTP id 79D4421F8BB8 for <rtcweb@ietf.org>; Mon, 22 Aug 2011 09:48:26 -0700 (PDT)
Received: from mangole.dcs.gla.ac.uk ([130.209.247.112]) by anchor-post-1.mail.demon.net with esmtpsa (AUTH csperkins-dwh) (TLSv1:AES128-SHA:128) (Exim 4.69) id 1QvXgp-0002BJ-g5; Mon, 22 Aug 2011 16:49:31 +0000
Mime-Version: 1.0 (Apple Message framework v1084)
Content-Type: multipart/alternative; boundary="Apple-Mail-8-717121590"
From: Colin Perkins <csp@csperkins.org>
In-Reply-To: <4E48D9E2.5080903@alvestrand.no>
Date: Mon, 22 Aug 2011 17:49:30 +0100
Message-Id: <C0359DB6-4B29-487F-ADD2-E806E623E691@csperkins.org>
References: <7F2072F1E0DE894DA4B517B93C6A05852203D41B70@ESESSCMS0356.eemea.ericsson.se> <4e4d793b-8748-41c8-a9ea-ded2237cda03@email.android.com> <7F2072F1E0DE894DA4B517B93C6A05852203CD99E6@ESESSCMS0356.eemea.ericsson.se> <4E48D9E2.5080903@alvestrand.no>
To: Harald Alvestrand <harald@alvestrand.no>
X-Mailer: Apple Mail (2.1084)
Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] draft-alvestrand-one-rtp-00.txt and profile
X-BeenThere: rtcweb@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Real-Time Communication in WEB-browsers working group list <rtcweb.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/rtcweb>, <mailto:rtcweb-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/rtcweb>
List-Post: <mailto:rtcweb@ietf.org>
List-Help: <mailto:rtcweb-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/rtcweb>, <mailto:rtcweb-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Aug 2011 16:48:27 -0000

On 15 Aug 2011, at 09:33, Harald Alvestrand wrote:
> On 08/15/11 09:57, Christer Holmberg wrote:
>> 
>> There are discussions in other SDOs about using AVPF for video and AVP for audio,             within a session.
>>  
>> However, those discussions are not within the context of multiplex.
> I added the following text:
> 
> The reason for the requirement for systematic proto is that there are many combinations that don't make sense (for instance "RTP/AVPF" in one section and "RTP/SAVP" in another would make encryption and availability of TMMBR depend on the outcome of negotiation, which seems strange). The cases where combinations make sense (RTP/AVPF with UDP/FEC for instance) also usually require that separate RTP sessions be used. [[QUESTION IN DRAFT: Are there sensible combinations?]]
> 
> Makes sense?
>> 


The only combinations I can think of that make sense are RTP/AVP with RTP/AVPF, and RTP/SAVP with RTP/SAVPF. It's not clear why you'd bother though, since the AVPF variant behaves the same as the AVP variant if you don't use the feedback.

-- 
Colin Perkins
http://csperkins.org/

v2.23.0 | Report a Bug | By Email