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Application of Traffic Shaping for Quality-Preserving in Video Streaming over IP

机译：交通塑造在IP上视频流中的质量保存

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摘要

In this paper, we propose the use of traffic shaping to mitigate the effects of network impairments in viewer's perceived quality of video streaming over IP. Traffic shaping is used to change the burstiness of video considering the characteristics of MPEG-4 encoding. In MPEG-4, the bursts of traffic are caused by variable length of frames. I-frames are very important in image reconstruction and produce the biggest bursts, so the packets carrying the I-frames are more likely to experience higher delay or be discarded. We propose a method of shaping the video traffic to distribute the bursts over time as much as possible. This procedure reduces the negative effects of bursts on the viewer's perceived quality. We choose to use the token bucket algorithm due to its low computational complexity and wide availability in servers and routers. The main contribution of the paper is a method to configure the token bucket parameters using the video characteristics. The efficiency of the proposed method is demonstrated through computer simulations, and the results indicate that the proposed method effectively mitigates the effects of network impairments in viewer's perceived quality.
机译：在本文中，我们建议使用流量整形来减轻网络损伤对观众感知的IP视频流质量的影响。考虑到MPEG-4编码的特点，流量整形用于改变视频的突发性。在MPEG-4中，突发流量是由可变长度的帧引起的。I帧在图像重建中非常重要，会产生最大的突发，因此携带I帧的数据包更有可能经历更高的延迟或被丢弃。我们提出了一种对视频流量进行整形的方法，以尽可能多地随时间分布突发。这个过程减少了爆发对观众感知质量的负面影响。我们选择使用令牌桶算法，因为它的计算复杂度低，在服务器和路由器中具有广泛的可用性。本文的主要贡献是一种利用视频特征配置令牌桶参数的方法。通过计算机仿真验证了该方法的有效性，结果表明该方法有效地缓解了网络损伤对观看者感知质量的影响。

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