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首页> 外文期刊>Journal of visual communication & image representation >Content-aware error-resilient transcoding using prioritized intra-refresh for video streaming
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Content-aware error-resilient transcoding using prioritized intra-refresh for video streaming

机译：使用优先级内部刷新进行视频流传输的内容感知错误恢复代码转换

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摘要

Transmitting video data over wireless networks can be very unreliable due to packet-loss, leading to serious video quality degradation which is annoying to human perception. The lost packets not only affect the quality of current frame, but also lead to error propagation to subsequent frames due to motion-compensated prediction techniques used in standard video codecs. Adding error-resilience to a video bitstream for robust video delivery to users thus becomes a very important issue. In this work, we propose a two-pass intra-refresh transcoding scheme for inserting error-resilience features to a compressed video at the media gateway of a three-tier streaming system. The proposed transcoder can adaptively vary the intra-refresh rate according to the video content and the channel's packet-loss rate to protect the most important macroblocks (MBs) against packet loss. In the first-pass encoding, the encoder estimates the amount of error propagation at MB level, and then generates side information as transcoding hints for use at the transcoder. In the second-pass transcoding, the error-resilient trans-coder adaptively determines the intra-refresh rate and the locations of MBs to perform intra-refresh according to the side information. Experimental results show that the proposed method can effectively mitigate the error propagation due to packet loss so as to improve the visual quality significantly. The proposed transcoder can also meet the real-time requirement.
机译：由于丢包，通过无线网络传输视频数据可能非常不可靠，从而导致严重的视频质量下降，这使人感到烦恼。丢失的数据包不仅影响当前帧的质量，而且由于在标准视频编解码器中使用的运动补偿预测技术而导致错误传播到后续帧。因此，在视频比特流中增加容错能力以将视频稳定地传递给用户成为一个非常重要的问题。在这项工作中，我们提出了一种两遍帧内刷新代码转换方案，用于在三层流系统的媒体网关处将错误恢复功能插入到压缩视频中。提出的代码转换器可以根据视频内容和通道的丢包率自适应地更改帧内刷新率，以保护最重要的宏块（MB）免受丢包的影响。在首遍编码中，编码器估计MB级别的错误传播量，然后生成辅助信息作为代码转换提示，以供代码转换器使用。在第二遍代码转换中，容错性代码转换器根据辅助信息自适应地确定帧内刷新率和MB的位置以执行帧内刷新。实验结果表明，该方法可以有效减轻由于丢包引起的误码传播，从而显着提高视觉质量。提出的代码转换器也可以满足实时要求。

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