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IETF RFC 6051
[ACTIVE]

Rapid Synchronisation of RTP Flows

Metadata

Publisher
IETF
Doc Type
Standard
Pages
22
Abstract
This memo outlines how RTP 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 synchronisation delay. This increase in delay can be unacceptable to some applications that use layered and/or multi-description codecs. This memo introduces three mechanisms to reduce the synchronisation delay for such sessions. First, it updates the RTP Control Protocol (RTCP) timing rules to reduce the initial synchronisation delay for SSM sessions. Second, 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. Finally, 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. [STANDARDS-TRACK]
Publication Date
2010-11-01
Status Note
Proposed Standard
DOI
10.17487/RFC6051
Link
https://doi.org/10.17487/RFC6051
Author(s)
Colin Perkins
Thomas Schierl
Keyword(s)
RTCP, MCU, SSM
Latest version of IETF RFC 6051

Document Versions — IETF RFC 6051

  • ▶ IETF RFC 6051 (2010-11-01)
    THIS DOC [ACTIVE] [LATEST VERSION]

Normative Reference(s)

Bibliographic Reference(s)

  • Zimmermann, P., Johnston, A., Ed., and J. Callas, "ZRTP: Media Path Key Agreement for Unicast Secure RTP", Work in Progress, June 2010. EXTERNAL
  • Wenger, S., Wang, Y., Schierl, T., and A. Eleftheriadis, "RTP Payload Format for SVC Video Coding", Work in Progress, October 2010. EXTERNAL
  • VerSteeg, B., Begen, A., VanCaenegem, T., and Z. Vax, "Unicast-Based Rapid Acquisition of Multicast RTP Sessions", Work in Progress, October 2010. EXTERNAL
  • IETF RFC 3556 [Active*]
  • IETF RFC 3711 [Active*]
  • RFC5117 — RFC5117 EXTERNAL
  • RFC5245 — 19 EXTERNAL
  • RFC5576 — RFC5576 EXTERNAL
  • RFC5691 — RFC5691 EXTERNAL
  • IETF RFC 5764 [Active*]
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IETF RFC 6051, Rapid Synchronisation of RTP Flows. Available at https://doi.org/10.17487/RFC6051
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IETF RFC 6051, Rapid Synchronisation of RTP Flows. Available at https://doi.org/10.17487/RFC6051

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IETF RFC 6051, Rapid Synchronisation of RTP Flows. Available at https://doi.org/10.17487/RFC6051
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<span class="citation"><cite>IETF RFC 6051</cite>, Rapid Synchronisation of RTP Flows. Available at <a href="https://doi.org/10.17487/RFC6051" target="_blank" rel="noopener">https://doi.org/10.17487/RFC6051</a></span>

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IETF RFC 6051, Rapid Synchronisation of RTP Flows
doi: 10.17487/RFC6051
url: https://doi.org/10.17487/RFC6051
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<cite id="bib-rfc6051">IETF RFC 6051</cite>, Rapid Synchronisation of RTP Flows
<span class="doi">10.17487/RFC6051</span>
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