Analysis of drift-error propagation in H.264/AVC transcoder for variable bitrate streaming system
Analysis of drift-error propagation in H.264/AVC transcoder for variable bitrate streaming system
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DOI：
10.1109/tce.2011.5955237
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发表时间：
2011-07
影响因子：
4.3
通讯作者：
Kwee-Li Cheng;Naofumi Uchihara;H. Kasai
中科院分区：
文献类型：
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作者：
Kwee-Li Cheng;Naofumi Uchihara;H. Kasai
视频转码是消费电子服务器和网关产品中用于可变比特率视频流系统的最基本技术之一。特别地，对于实时流传输系统，期望不需要高复杂度转码过程的漂移误差弹性编码比特流。为了在编码器端生成抗漂移误差的编码码流，本文研究了H. 264/AVC中采用不同运动补偿精度时漂移误差的传播特性。结果表明，六抽头滤波器的使用增加了半像素MC精度的漂移误差传播。对于四分之一像素MC精度，漂移误差传播减小。此外，我们发现，重新量化参数和MC精度只影响重新量化帧中的错误量，但错误传播量取决于MC精度和像素值的顺序。它也被发现，漂移误差传播比定义在某个点，而不管MC精度。
Video transcoding is one of the most essential technologies in consumer electronics server and gateway products for a variable bitrate video streaming system. Especially, for a real-time streaming system, drift-error resilient coded bitstreams that do not require high complexity transcoding processes are desired. For the generation of drift-error resilient coded bitstreams at the encoder side, an investigation on the drift-error propagation characteristic in H.264/AVC by applying different motion compensation (MC) precisions are carried out in this paper. The results show that the drift-error propagation in half-pixel MC precision increases due to the usage of six-tap filter. For quarter-pixel MC precision, the drift-error propagation decreases. Besides that, we found out that the requantization parameter and MC precision only affects the amount of error in the requantized frame but amount of error propagation depends on the MC precision and sequence of the pixel value. It is also found that drift-error propagation ratio is defined at some point regardless of MC precisions.