Technical
Report 2003-04-18
Internetworking and Media Communications Research Laboratories
Department of Computer Science,
http://medianet.kent.edu/technicalreports.html
Thesis Title:
SCALABLE TRANSCODING FOR DYNAMIC
VIDEO RATE ADAPTATION
Darshan Patel
dpatel@cs.kent.edu
Advisor:
Dr. Javed I. Khan
Department of
May 2003
Abstract:
This research investigates
techniques for extreme scalable video communication. With the advent of more
dynamic and heterogeneous network it seems rate transcoding
is also becoming increasingly important.
In network delivery of digital video, if the bandwidth required for a
video is not available, the video has to be served at a reduced bit rate.
Adaptation is also required if digital video have to be served to terminals
with varying memory, processing power and display sizes. It is also highly
desirable that the transcoding be carried out in real
time while maintaining reasonable image quality. Besides speed and quality,
another important challenge is the transcoding ratio.
Current transcoding techniques use variants of
quantization-based method and achieve transcoding
ratio less than
In this thesis we investigate a
fast transcoding technique for expanding the transcoding ratio beyond the current state of the art. We propose a technique, which combines
traditional quantization based technique with tiling. We also show how to
determine the optimum operation point between the quantization step size and
tile size. We also show technique for corresponding motion vector inference
that can avoid costly motion vector estimation and achieve faster transcoding. We have implemented an MPEG-2 ISO/IEC 13818-2
complaint transcoding scheme using this technique.
The system achieves a transcoding ratio of
approximately 1:60 on average. The thesis will present the technique and
performance characteristics of this new transcoding
system.
- Thesis [pdf]
- Demo
- Graphics
- Simulation Software [Zip]
- Software
Document
- Publications & Technical Reports
- Javed I. Khan,
Darsan Patel, Seung S. Yang, et. al. “ Resource Adaptive Netcentric
Systems on Active Network: A Self-Organizing Video Stream that Auto
Morphs Itself while in Transit via a Quasi-Active Network”,
Proceedings of the DARPA Active Networks Conference and Exposition, DANCE
2002, San Jose, CA May 21-24, 2002, IEEE Computer Society Press,
[available at URL http://medianet.kent.edu/technicalreports.html, also
mirrored at http://bristi.facnet.mcs.kent.edu/~javed/medianet/technicalreports.html]
(accepted as full paper).
- The system has been used in two
demonstrations- one in ACM Multimedia’ 2001 and DARPA DANCE
Exposition 2002.
- Other Related Links
- TR2000-10-01 A
Performance Profile of MPEG-2 Transcoding with
Motion Vector Reuse, October, 2000 [Patel, Oh]
- TR2001-01-01 Architectural
Overview of Motion Vector Reuse Mechanism in MPEG-2 Transcoding,
January, 2001 [Khan, Patel, ALL]
Last Modified: November 2002.