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[AVT] Fwd: I-D Action:draft-perkins-avt-rapid-rtp-sync-03.txt

The changes in this version are primarily editorial; we're aware that not all the open issues have been addressed yet. Any further comments are welcomed.
Chairs: we'd like this to be considered as an AVT working group draft, as indicated privately. 

Cheers,
Colin




Begin forwarded message:

From: Internet-Drafts at ietf.org
Date: 9 March 2009 17:15:02 GMT
To: i-d-announce at ietf.org
Subject: I-D Action:draft-perkins-avt-rapid-rtp-sync-03.txt
Reply-To: internet-drafts at ietf.org
A New Internet-Draft is available from the on-line Internet-Drafts directories. 

	Title           : Rapid Synchronisation of RTP Flows
	Author(s)       : C. Perkins, T. Schierl
	Filename        : draft-perkins-avt-rapid-rtp-sync-03.txt
	Pages           : 17
	Date            : 2009-03-09

This memo outlines how RTP multimedia sessions are synchronised, and
discusses how rapidly such synchronisation can occur.  We show that
most RTP sessions can be synchronised immediately, but that the use
of video switching multipoint conference units (MCUs) or large source
specific multicast (SSM) groups can greatly increase the initial
synchronisation delay.  This increase in delay can be unacceptable to
some applications that use layered and/or multi-description codecs.

This memo updates the RTP Control Protocol (RTCP) timing rules to
reduce the initial synchronisation delay for SSM sessions.  A new
feedback packet is defined for use with the Extended RTP Profile for
RTCP-based Feedback (RTP/AVPF), allowing video switching MCUs to
rapidly request resynchronisation.  Two new RTP header extensions are
defined to allow rapid synchronisation of late joiners, and guarantee
correct timestamp based decoding order recovery for layered codecs in
the presence of clock skew.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-perkins-avt-rapid-rtp- sync-03.txt 

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

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