Analysing GOP structure and packet loss effects on error propagation in MPEG-4 video streams
Analysing GOP structure and packet loss effects on error propagation in MPEG-4 video streams
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DOI：
10.1109/isccsp.2010.5463469
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发表时间：
2010-03
期刊：
影响因子：
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通讯作者：
Árpád Huszák;S. Imre
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文献类型：
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作者：
Árpád Huszák;S. Imre
视频流应用通常用于有线和无线环境；然而，无线链路的丢包率和时延变化给链路带来了负担。为了使无线网络中的视频传输成为可能，通常采用MPEG视频编码来达到链路带宽的限制。视频质量和压缩比取决于GOP （Group of Pictures）结构，但由于丢包也会影响视频流的失真灵敏度。本文研究了GOP大小、丢包率和视频质量之间的关系。通过增加参考帧之间的距离可以提高编码的有效性，但另一方面也增加了由于丢包而导致的错误传播的影响。我们的目标是找到最优的GOP结构，以最大限度地提高编码效率和最小化由于误差传播造成的质量失真。我们实现了一个仿真工具来分析在有损信道上传输的不同结构的视频流。
Video streaming applications are commonly used in both wired and wireless environment; however, wireless links are burden by higher packet loss ratio and delay variation. In order to make video transmission possible in wireless networks MPEG video coding is usually used to reach the bandwidth constrains of the links. The video quality and compression ratio depends on Group of Pictures (GOP) structure, but it also affects the distortion sensitivity of the video stream due to packet losses. In this paper the correlation between GOP size, packet loss ratio and video quality is investigated. By increasing the distance between the reference frames the effectiveness of coding can be improved, but on the other hand the effect of error propagation due to packet losses also increases. Our aim was to find the optimal GOP structure to maximize the coding efficiency and minimize the quality distortion due to error propagation. We have implemented a simulation tool to make the analysis of differently structured video streams transmitted over lossy channels.