VBR视频流量平滑中的流量特征及平滑准则

Junbiao Zhang, J. Hui
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引用次数: 26

摘要

由于可变比特率(VBR)视频固有的突发性,在VBR视频传输中,为了提高网络利用率和降低连接成本,往往需要进行流量平滑。为了衡量平滑方法的有效性,必须首先对平滑输出流量定义平滑准则。在本文中,我们介绍了两种简单但实用的VBR视频传输类型。对于每种类型,我们定义了三组参数来表征流量平滑性和连接成本,并且我们表明,在每种情况下,存在一种算法来优化所有三个参数,给定缓冲区和延迟约束。进一步,我们建立了这些算法之间的关系,并通过将它们应用于MPEG视频流来证明它们的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Traffic characteristics and smoothness criteria in VBR video traffic smoothing
Due to the inherent burstiness in variable bit rate (VBR) videos, traffic smoothing is often necessary to improve network utilization and reduce connection costs in VBR video transmission. In order to measure the effectiveness of smoothing methods, it is essential that smoothness criteria be first defined on the smoothing output traffic. In this paper, we introduce two simple, yet practical types of traffic for VBR video transmission. For each type, we define three sets of parameters to characterize the traffic smoothness and connection cost, and we show that, in each case, an algorithm exists to optimize all three parameters, given buffer and delay constraints. Further, we establish the relationship between these algorithms and show their effectiveness by applying them to an MPEG video stream.
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