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University of California at Berkeley
Computer Science Division
CS 298-3 Colloquim

"Resilient Video Transmission" or "From Practice to Theory and Back"

Andres Albanese and Michael Luby
International Computer Science Institute

Wednesday, November 1, 1995
Soda Hall Auditorium, Room 306
4:00 - 5:00 p.m.

Abstract:

With the explosion of information highways, network heterogeneity becomes a
major issue. It is a challenge to write universal applications that run over
interconnected packet networks with many subnetworks of unevenly distributed
resources (processing, bandwidth, storage, and congestion control policies,
etc.). Applications generate bursty traffic in today's packet networks,
causing unavoidable losses. Thus, for applications such as real-time video
transmission, it is desirable for information to be compressed, prioritized
and encoded so that the application can degrade gracefully under
unpredictable network conditions. An ongoing joint project, headed by Andres
Albanese and Michael Luby, has been developing a very promising solution to
this problem for the past two years. The approach, called Priority Encoding
Transmission (PET), introduces a general method for prioritizing and
redundantly encoding information into packets to allow graceful degradation
with losses. One version of PET has been successfully integrated into the
VIC teleconferencing application to protect MPEG video transmission. Mike
will first describe some of his general theory interests and projects, and
then move on to talk more specifically about the PET project. The PET part
of the talk will describe some of the interesting (both theoretical and
practically) algorithms and models that have evolved out of this work, as
well as present some outstanding open problems. Emphasis will be placed on
the very strong and successful interplay between practical concerns and
theoretical ideas that have been the driving force behind this project.
Andres will continue the talk, giving a general motivation to the PET work,
and describe our experience in successfully integrating PET into some of the
applications that work over heterogeneous local and wide area networks,
including ATM based networks like BAGNet (Bay Area Gigabit Network), MAY
(Multimedia Applications on Intercontinental-Highway), and Internet. Andres
will conclude the talk with his perspective on the future of the ongoing
interplay between multimedia applications and networks, and describe some
future projects that he would like to lea

This colloquium is sponsored in part by a generous contribution from
Hewlett-Packard Company

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