Audio/Video Transport (avt)

In addition to this official charter maintained by the IETF Secretariat, there is additional information about this working group on the Web at:

RTP FAQ Page

Last Modified: 2007-10-23

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

Chair(s):

Colin Perkins <csp@csperkins.org>

Roni Even <roni.even@polycom.co.il>

Tom Taylor <tom.taylor@rogers.com>

Real-time Applications and Infrastructure Area Director(s):

Jon Peterson <jon.peterson@neustar.biz>

Cullen Jennings <fluffy@cisco.com>

Real-time Applications and Infrastructure Area Advisor:

Cullen Jennings <fluffy@cisco.com>

Mailing Lists:

General Discussion: avt@ietf.org
To Subscribe: https://www1.ietf.org/mailman//listinfo/avt
Archive: http://www.ietf.org/mail-archive/web/avt/index.html

Description of Working Group:

The Audio/Video Transport Working Group was formed to specify a
protocol for real-time transmission of audio and video over unicast
and multicast UDP/IP. This is the Real-time Transport Protocol, RTP,
together with its associated profiles and payload formats. The
current aims of the working group are:

- to review and revise existing payload formats to advance those
which are useful to Draft Standard, and to declare others
as Historic. Milestones will be established as a champion for
each payload format is identified.

- to develop payload formats for new media codecs, and to
document best-current practices in payload format design.
The group continues to be precluded from work on codecs
themselves because of overlap with the other standards
bodies, and because the IETF does not have the ability
to effectively review new codecs. An exception was made
for the freeware iLBC codec on a highly experimental basis,
but acceptance of new codec work is unexpected and subject
to rechartering.

- to complete the forward error correction work to update
RFC 2733 in the form of the ULP payload format

- to investigate and if suitable develop a framework for advanced
FEC codes and their usage for RTP, possibly with alignment to
the RMT WG's FEC building block.

- to extend RTP to work with Source-Specific Multicast sessions
with unicast feedback

- to provide a framing mechanism for RTP over TCP and TLS

- in collaboration with the MPLS and ROHC WGs, to develop a solution
for header compression of RTP across MPLS networks that avoid
decompression and compression at each MPLS node.

- to develop a new RTP profile as the combination of the SRTP
profile and the Extended RTP Profile for RTCP-based Feedback
(RTP/SAVPF)

- to develop a new RTP profile for usage of TFRC (RFC 3448) with
RTP over UDP to allow application developers to gain experience
with TCP friendly congestion control.

- to develop a MIB for RTCP XR (RFC 3611).

- to update the RTP MIB, including aligning it with RFC 3550.

The longer term goals of the working group are to advance the
SRTP Profile, the Extended RTP Profile for RTCP-based Feedback,
the Compressed RTP framework, and the RTP MIB to Draft Standard.

The group has no plans to develop new RTP profiles beyond those
listed above, but will consider rechartering to produce profile
level extensions if appropriate.

Goals and Milestones:

Done		Review DCCP including prototypes and API; feedback to DCCP WG
Done		Initial draft requirements for ECRTP over MPLS; discuss with MPLS WG
Done		Submit iLBC payload format for Proposed Standard
Done		Submit iLBC codec specification for Experimental
Done		Advance RTP specification and A/V profile to Full Standard
Done		Submit RTP/SAVPF profile for Proposed Standard
Done		Finished investigation of advanced FEC codes for RTP, update plan
Done		Submit ULP Payload Format for Proposed Standard
Feb 2007		Submit Codec Control Messages for Proposed Standard
Done		Submit SMTPE Timestamping of Media for Proposed Standard
Mar 2007		Submit SRTP for Draft Standard
Mar 2007		Submit RTCP XR Video Metrics block for Proposed Standard
Done		Submit Multiplexing of RTCP and RTP on the same port for Proposed Standard
Apr 2007		Submit RTCP/SSM draft for Proposed Standard
Jul 2007		Submit update of RTP MIB for Proposed or Draft Standard
Done		Submit draft on Enhancing RTP header extensions for proposed standard
Aug 2007		Submit RTCP XR MIB for Proposed Standard
Aug 2007		Submit RTCP XR High Resolution Audio Metrics for Proposed Standard
Sep 2007		Submit RTP/AVPF for Draft Standard
Dec 2007		Submit in band keying mechanism for SRTP draft for Proposed Standard
Feb 2008		Submit draft on Mechanisms to keep NAT bindings for RTP flows alive for BCP
Sep 2008		Submit Non-Compound usage specification for PS

Internet-Drafts:

Request For Comments:

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