AUTHORS: Carlos Marcelo Pedroso, Valter Klein

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ABSTRACT: 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.

KEYWORDS: Multimedia Communication, Video Streaming, Viewer-perceived Quality, Traffic Shaping

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