[AVT] Fwd: I-D Action:draft-perkins-avt-rapid-rtp-sync-02.txt

[Colin Perkins <[e-mail]>]

This draft is a merger between draft-perkins-avt-rapid-rtp- 
sync-01.txt and draft-schierl-avt-rtp-ntp-for-layered-codecs-00.txt.

Please send any comments to the list. We'd like this to be considered  
for adoption as an AVT working group draft.

Colin



Begin forwarded message:
> From: [e-mail]
> Date: 13 February 2009 14:45:01 GMT
> To: [e-mail]
> Subject: I-D Action:draft-perkins-avt-rapid-rtp-sync-02.txt
> Reply-To: [e-mail]
>
> 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-02.txt
> 	Pages           : 18
> 	Date            : 2009-02-13
>
> 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-02.txt



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