IETF Logo Mail Archive

Re: [MMUSIC] BUNDLE/SDP : ISSUE#1: Should BUNDLE allow/disallow PT sharing ??

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 22 October 2013 07:07 UTC

Return-Path: <christer.holmberg@ericsson.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 396EA11E848B for <mmusic@ietfa.amsl.com>; Tue, 22 Oct 2013 00:07:24 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -5.377
X-Spam-Level:
X-Spam-Status: No, score=-5.377 tagged_above=-999 required=5 tests=[AWL=0.271, BAYES_00=-2.599, HELO_EQ_SE=0.35, HTML_MESSAGE=0.001, J_CHICKENPOX_15=0.6, RCVD_IN_DNSWL_MED=-4]
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 W45bu+g7omgU for <mmusic@ietfa.amsl.com>; Tue, 22 Oct 2013 00:07:18 -0700 (PDT)
Received: from mailgw2.ericsson.se (mailgw2.ericsson.se [193.180.251.37]) by ietfa.amsl.com (Postfix) with ESMTP id 3F53311E8480 for <mmusic@ietf.org>; Tue, 22 Oct 2013 00:07:07 -0700 (PDT)
X-AuditID: c1b4fb25-b7eff8e000000eda-d9-526624193f84
Received: from ESESSHC016.ericsson.se (Unknown_Domain [153.88.253.124]) by mailgw2.ericsson.se (Symantec Mail Security) with SMTP id 54.EF.03802.91426625; Tue, 22 Oct 2013 09:07:05 +0200 (CEST)
Received: from ESESSMB209.ericsson.se ([169.254.9.201]) by ESESSHC016.ericsson.se ([153.88.183.66]) with mapi id 14.02.0328.009; Tue, 22 Oct 2013 09:07:05 +0200
From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Suhas Nandakumar <suhasietf@gmail.com>, mmusic WG <mmusic@ietf.org>
Thread-Topic: BUNDLE/SDP : ISSUE#1: Should BUNDLE allow/disallow PT sharing ??
Thread-Index: AQHOzvEGAK09jdqBHE6Hl1BA4xIV25oATL0l
Date: Tue, 22 Oct 2013 07:07:04 +0000
Message-ID: <y6y54kq11531bhadxepc59up.1382425621852@email.android.com>
References: <CAMRcRGQd6YvrWnUw77JMpNT4GFH6ce-FT8LxeywV6_pZ9w=n3w@mail.gmail.com>
In-Reply-To: <CAMRcRGQd6YvrWnUw77JMpNT4GFH6ce-FT8LxeywV6_pZ9w=n3w@mail.gmail.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
Content-Type: multipart/alternative; boundary="_000_y6y54kq11531bhadxepc59up1382425621852emailandroidcom_"
MIME-Version: 1.0
X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrOLMWRmVeSWpSXmKPExsUyM+Jvja6kSlqQway3hhYdk9ksTtw4zWwx dfljFoudczuYHVg8pvzeyOqxc9Zddo8Fm0o9liz5yRTAEsVlk5Kak1mWWqRvl8CVMeH0TtaC TSoVNw8sZmxgXC/XxcjJISFgIrFseSszhC0mceHeejYQW0jgMKPE3cthEPYSRon1Tzm7GDk4 2AQsJLr/aYOERQTcJfZd/8wKYjMLeEmcPnuABcQWFvCVWLfoCRtETYDE2f1vmSFsI4krbxuY QMawCKhKLDmZBBLmFXCTOPUQokQIqHzJ5fXsIDanQKDE5tl9YGMYgS77fmoNE8QqcYlbT+Yz QVwsILFkz3mo60UlXj7+B3VOjkRrUy8LxHxBiZMzn7BMYBSZhaR9FpKyWUjKIOJ6EjemTmGD sLUlli18zQxh60rM+HeIBVl8ASP7Kkb23MTMnPRyo02MwMg6uOW36g7GO+dEDjFKc7AoifN+ eOscJCSQnliSmp2aWpBaFF9UmpNafIiRiYNTqoGx5aVv1n8Du6+J6+atN//V8d85MtPtzL2y qSlKIruyVNJTmoVzj+5zf9QRaKM9j6HU2Z5FcO5jmzchd39nFSSaPnNcXrfp5J4C7Vcrn/yI On5l6bbUD2FljhvrshpTMuwT5p+Zkif357mJNnfI1Y3h/j9mMm3eHMd+Lzml2kM5xqD9/rJt ErOUWIozEg21mIuKEwEBhsqaegIAAA==
Cc: Cullen Jennings <fluffy@cisco.com>, Harald Alvestrand <hta@google.com>
Subject: Re: [MMUSIC] BUNDLE/SDP : ISSUE#1: Should BUNDLE allow/disallow PT sharing ??
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: Tue, 22 Oct 2013 07:07:24 -0000

Hi,

There is an ongoing discussion regarding the usage of identical PT values, where Jonathan and Bo have suggested criteria.

Regards,

Christer

Sent from my Sony Ericsson Xperia arc S

Suhas Nandakumar <suhasietf@gmail.com> wrote:



Hello All

   Section 5.2 in the draft-nandakumar-mmusic-sdp-mux-attributes-05 defines one category of OPEN ISSUE that was raised while analyzing multiplexing behavior of RFC4855, RFC5583 attributes for example.

As an example, let's consider the  SDP Example (copied from the draft)



// PTs are shared and have different feedback types
   a=group:BUNDLE audio video
   m=audio 3456 RTP/AVP 98
   a=mid:audio
   a=rtpmap:98 iLBC/8000
   a=rtcp-fb ack                  // Positive ACK
   m=video 3456 RTP/AVP 98
   a=mid:video
   a=rtpmap:98 VP8/90000
   a-rtcp-fb:98 nack rpsi        // Nack ACK

In the above case, PT 98 is repeated between the audio and video media lines. Audio media line has rtcp-fb ack and video media line has rtcp-fb nack.

Since RTCP reporting happens per RTP Session, we can see the following high level questions :

0. Should this be allowed ?

1. What should be the expected behavior in this scenario ?

2. What category assignment makes sense in here - IDENTICAL or NORMAL ??


Cheers
Suhas

v2.23.0 | Report a Bug | By Email