[Tccc] CFP Packet Video 2013 - Special Session on Low-...
Michael Welzl
michaweatifi.uio.no
Thu May 16 08:38:42 EDT 2013
Hi,
This should be of interest to anyone working on the combination of video + low
latency... please consider sending your paper there, thanks!
Cheers,
Michael
Packet Video 2013 - Special Session on Low-Latency Interactive Video
Sponsored by IEEE Communications Society
December 12. and 13., 2013, San Jose, Ca, USA
Call for papers.
http://pv2013.itec.aau.at/call-for-papers/accepted-special-sessions/#ss1
Several years ago, it was found that users do not like video quality
fluctuations. At that time the predominant belief was that network rate
fluctuations should be minimized, in order to reasonably interoperate with TCP
in the network. This led to the creation of a number of so-called
"TCP-friendly" congestion controls that exhibit a smoother sending rate than
TCP, while avoiding to send more than a conformant TCP under similar
conditions. TFRC is perhaps the best known example of such a congestion control
mechanism.
A lot has happened since then:
The notion of TCP-friendliness has received massive criticism; the
widespread deployment of a more aggressive TCP variant, CUBIC, has not led to
an Internet meltdown, making the case that diverging from strict
TCP-friendliness is possible.
Latency minimization has become a major goal, especially in the face
of bufferbloat: large delays from large buffers with simplistic FIFO-queue
management.
Codecs have improved; novel video codecs are able to adjust the data
rate, but modern codecs may also produce variable bitrate transmissions with
burstier packet flows than before.
TFRC has been embedded in the DCCP protocol, which has probably never
been used for anything other than experiments; instead of running over DCCP,
RTP-based applications now contain proprietary congestion control mechanisms.
The emergence of the RTCWEB protocol suite for real-time communication between
Web browsers has renewed the interest in developing congestion control
standards for real-time media. This time, however, the goal is to get things
right: delay should be minimized, and standards should realize congestion
control using RTP with RTCP signaling. The IETF Real-time Media Congestion
Avoidance Techniques (RMCAT) working group has been founded to address this
need. New questions arise: what type of congestion controls do we need? How
much feedback should we send? How do we make this work in multi-user scenarios,
e.g., for video conferencing? What should be the API between a video codec and
a new delay-based congestion controlled RTP stream? What is the quality that
can be expected from the combination of a codec and congestion control
mechanism, when we consider better metrics than plain PSNR?
Topics of interest include, but are not limited to:
Congestion control algorithms for interactive real-time video:
requirements, evaluation criteria, and mechanisms
Necessary RTP/RTCP extensions
Field experience with video codecs in a low-delay, real-time setting
Interactions between applications and RTP flows
Failing to meet real-time schedules: impact, techniques to detect,
instrument or diagnose it
Organizers:
Michael Welzl, University of Oslo (michawe at ifi.uio.no)
Stein Gjessing, University of Oslo (steing at ifi.uio.no)
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