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avt-charter.txt
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Audio/Video Transport (avt)
---------------------------
Charter
Chair(s):
Stephen Casner <casner@isi.edu>
Transport Area Director(s)
Allison Mankin <mankin@cmf.nrl.navy.mil>
Mailing lists:
General Discussion:rem-conf@es.net
To Subscribe: rem-conf-request@es.net
Archive: nic.es.net:~/ietf/rem-conf/av-transport-archive
Description of Working Group:
The Audio/Video Transport Working Group was formed to specify experimental
protocols for real-time transmission of audio and video over UDP
and IP multicast. The focus of this Group is near-term and its
purpose is to integrate and coordinate the current AV transport
efforts of existing research activities. No standards-track
protocols are expected to be produced because UDP transmission of
audio and video is only sufficient for small-scale experiments
over fast portions of the Internet. However, the transport
protocols produced by this Working Group should be useful on a larger scale
in the future in conjunction with additional protocols to access
network-level resource management mechanisms. Those mechanisms,
research efforts now, will provide low-delay service and guard
against unfair consumption of bandwidth by audio/video traffic.
Similarly, initial experiments can work without any connection
establishment procedure so long as a priori agreements on port
numbers and coding types have been made. To go beyond that, we
will need to address simple control protocols as well. Since IP
multicast traffic may be received by anyone, the control
protocols must handle authentication and key exchange so that the
audio/video data can be encrypted. More sophisticated connection
management is also the subject of current research. It is
expected that standards-track protocols integrating transport,
resource management, and connection management will be the result
of later working group efforts.
The AVT Working Group may design independent protocols specific to each
medium, or a common, lightweight, real-time transport protocol
may be extracted. Sequencing of packets and synchronization
among streams are important functions, so one issue is the form
of timestamps and/or sequence numbers to be used. The Working Group will
not focus on compression or coding algorithms which are domain of
higher layers.
Goals and Milestones:
Done Define the scope of the Working Group, and who might contribute. Our
first step will be to solicit contributions of potential protocols
from projects that have already developed packet audio and video.
From these contributions we will distill the appropriate protocol
features.
Done Conduct a teleconference Working Group meeting using a combination of
packet audio and telephone. The topic will be a discussion of issues
to be resolved in the process of synthesizing a new protocol.
Done Review contributions of existing protocols, and discuss which
features should be included and tradeoffs of different methods. Make
writing assignments for first-draft documents.
Done Post an Internet-Draft of the lightweight audio/video transport
protocol.
May 93 Post a revision of the AVT protocol addressing new work and security
options as an Internet Draft.
Jun 93 Submit the AVT protocol to the IESG for consideration as an
Experimental protocol.
Internet Drafts:
Posted Revised I-D Title <Filename>
------ ------- ------------------------------------------
Oct 92 New <draft-ietf-avt-issues-00.txt, .ps>
Issues in Designing a Transport Protocol for Audio and Video
Conferences and other Multiparticipant Real-Time Applications
Dec 92 May 93 <draft-ietf-avt-rtp-01.txt>
A Transport Protocol for Real-Time Applications
Dec 92 New <draft-ietf-avt-encodings-00.txt>
Media Encodings
Dec 92 New <draft-ietf-avt-profile-00.txt>
Sample Profile for the Use of RTP for Audio and Video
Conferences with Minimal Control
Mar 93 New <draft-ietf-avt-video-packet-00.txt>
Packetization of H.261 video streams
Request For Comments:
None to date.