[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)
_______________________________________________
IEEE Communications Society Tech. Committee on Computer Communications
(TCCC) - for discussions on computer networking and communication.
Tccc at lists.cs.columbia.edu
https://lists.cs.columbia.edu/cucslists/listinfo/tccc
 




More information about the TCCC mailing list