IETF 82 Proceedings

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Audio/Video Transport Extensions (avtext) (WG)

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Additional information is available at tools.ietf.org/wg/avtext

Chair(s): Magnus Westerlund Keith Drage Real-time Applications and Infrastructure Area Director(s): Gonzalo Camarillo Robert Sparks * The Real-time Applications and Infrastructure Area Directors were seated during the IETF 65. Real-time Applications and Infrastructure Area Advisor: Gonzalo Camarillo

Meeting Slides

• AVTEXT WG Status
• IEEE 1588/802.1AS Synchronisation for RTP Streams
• RTCP SDES SRCNAME
• RTP Media Stream Pause and Resume

Internet-Drafts:

• Support for multiple clock rates in an RTP session (24844 bytes)
• Considerations for Deploying the Rapid Acquisition of Multicast RTP Sessions (RAMS) Method (23374 bytes)
• Content Splicing for RTP Sessions (34848 bytes)

Request for Comments:

• Multicast Acquisition Report Block Type for RTP Control Protocol (RTCP) Extended Reports (XRs) (RFC 6332) (35217 bytes)
• A Real-Time Transport Protocol (RTP) Header Extension for Client-to- Mixer Audio Level Indication (RFC 6464) (18809 bytes)
• A Real-Time Transport Protocol (RTP) Header Extension for Mixer-to-Client Audio Level Indication (RFC 6465) (30154 bytes)

Charter (as of 2011-12-09)

The Full-Standard Real-time Transport Protocol, RTP [RFC 3550], along
with its associated profiles and payload formats provides for real-
time transmission of audio and video over unicast and multicast
transports. RTP is widely implemented, and deployed for a wide range
of applications, ranging from telephony to television over IP. As new
applications have emerged, the need for guidelines for the use of the
RTP/RTCP protocols and extensions specific to those applications
has been identified.

The AVTEXT working group is charted to develop application-specific
guidelines for the use of RTP/RTCP protocols with the AVP, SAVP,
AVPF, and SAVPF profiles, and extensions to those protocols that are
driven by application-specific needs. Proposals for extensions with
general applicability to many different RTP/RTCP usages should be
taken to the AVTCORE working group.

The AVTEXT working group is constrained to use the protocol extension
mechanisms defined in the core protocols (such as RTP Header
extensions [RFC5285], AVPF Feedback Messages [RFC4585], and
SDES Items [RFC3550]). If new ways to extend the core protocols are
needed, they will be developed in the AVTCORE working group.

In addition to the milestones called out below, the AVTEXT working
group's initial tasks will include completing any new work identified
during IESG evaluation for the Rapid Acquisition of Multicast RTP
Sessions.

Goals and Milestones:

Jun 2011		Submit Considerations for RAMS Scenarios for Informational
Done		Submit RTP Header extension for mixer to client audio level indication as Proposed Standard
Done		Submit RTP Header extension for client to mixer audio level indication as proposed standard
Dec 2011		Submit Support for multiple clock rates in an RTP session for Proposed Standard
Dec 2011		Content splicing for RTP sessions as Informational