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Implications of Smoothing on Statistical Multiplexing of H.264/AVC and SVC Video Streams
| Citations: | 4 - 3 self |
BibTeX
@MISC{Auwera_implicationsof,
author = {Geert Van Der Auwera and Martin Reisslein},
title = {Implications of Smoothing on Statistical Multiplexing of H.264/AVC and SVC Video Streams},
year = {}
}
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Abstract
Abstract—While the hierarchical B frames based Scalable Video Coding (SVC) extension of the H.264/AVC standard achieves sig-nificantly improved compression over the initial H.264/AVC codec, the SVC video traffic is significantly more variable than H.264/AVC traffic. The higher traffic variability of the SVC encoder can lead to smaller numbers of streams supported with bufferless statistical multiplexing than with the H.264/AVC encoder (and even less streams than with the MPEG-4 Part 2 encoder) for prescribed link capacities and loss constraints. In this paper we examine the implications of video traffic smoothing on the numbers of statistically multiplexed H.264 SVC, H.264/AVC, and MPEG-4 Part 2 streams, the bandwidth requirements for streaming, and the introduced delay. We identify the levels of smoothing that ensure that more H.264 SVC streams than H.264/AVC streams can be supported. For a basic low-complexity smoothing technique that is readily applicable to both live and prerecorded streams, we identify the levels of smoothing that give (bufferless) statistical multiplexing performance close to an optimal off-line smoothing technique. We thus characterize the trade-offs between increased smoothing delay and increased statistical multiplexing performance for both H.264/AVC, which employs classical B frames, and H.264 SVC, which employs hier-archical B frames. We similarly identify the buffer sizes for the buffered multiplexing of unsmoothed H.264 SVC, H.264/AVC, and MPEG-4 Part 2 streams that give close to optimal performance. Index Terms—Delay, H.264/AVC, hierarchical B frames, smoothing, statistical multiplexing, SVC, video traffic. I.
Keyphrases
statistical multiplexing mpeg-4 part svc video stream video traffic hierarchical frame hier-archical frame bandwidth requirement link capacity avc codec optimal off-line smoothing technique buffered multiplexing classical frame traffic variability svc stream scalable video coding avc stream svc video traffic svc encoder avc traffic optimal performance statistical multiplexing performance index term delay bufferless statistical multiplexing introduced delay avc encoder loss constraint smoothing delay basic low-complexity smoothing technique prerecorded stream
