Fast Channel Switching Based on SVC in IPTV Environments

In Internet Protocol TeleVision (IPTV) systems, the use of video compression results in a trade-off between random access and bandwidth consumption. Most of the time, priority is given to compression efficiency, resulting in low channel switching performance. In this paper, a Scalable Video Coding (...

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Bibliographic Details
Published in:IEEE transactions on broadcasting 2012-03, Vol.58 (1), p.57-65
Main Authors: Van Wallendael, G., Van Lancker, W., De Cock, J., Lambert, P., Macq, J-F, Van de Walle, R.
Format: Article
Language:English
Subjects:
Applied sciences
Bandwidth
Broadcasting. Videocommunications. Audiovisual
Channel switching time
Coding, codes
Decoding
Delay
Exact sciences and technology
Image processing
Information, signal and communications theory
IPTV
Signal and communications theory
Signal processing
Static VAr compensators
Streaming media
SVC
Switches
Switching and signalling
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Television
zapping speed
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Summary:In Internet Protocol TeleVision (IPTV) systems, the use of video compression results in a trade-off between random access and bandwidth consumption. Most of the time, priority is given to compression efficiency, resulting in low channel switching performance. In this paper, a Scalable Video Coding (SVC) configuration is proposed, wherein base and enhancement layer are coded in such a way that fast channel switching can be offered without impacting the access network bandwidth consumption. This is achieved by encoding a full quality slow channel switching version of the video stream in the base layer extended with a reduced quality fast switching enhancement layer. Additionally, this configuration offers backward compatibility with H.264/AVC, enabling a gradual upgrade of the IPTV system from H.264/AVC to SVC. When comparing this technique to single layer H.264/AVC, 25.0% bandwidth reduction on the access network is obtained without impacting channel switching speed, but only at the cost of a slightly reduced quality ( -1 dB PSNR) during a short transition period (maximum 48 frames). If a comparison is made with a regular SVC configuration, 39.4% bandwidth reduction on the access network during steady state is obtained. Compared to simulcast H.264/AVC, 32.0% bandwidth reduction on the core network is observed.
ISSN:0018-9316
1557-9611
DOI:10.1109/TBC.2011.2170610