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    Efficient Bit Stream Switching of H.264 Coded Video

    机译:H.264编码视频的有效位流切换

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    摘要

    Stream switching among compressed video streams coded at different quality levels and bit rates is examined, and two enhanced stream switching schemes for H.264 video are proposed in this work. The flexibility of the original H.264 stream switching scheme is achieved at the cost of coding efficiency by introducing primary and secondary SP/SI pictures. In contrast, no modification is made to the original compressed streams in our enhanced schemes so that coding efficiency is maintained at switching points. When switching occurs, the two new schemes use a new picture type, called the difference picture (DIFF), in different ways to compensate the mismatch of reference frames. The difference picture can be coded efficiently, and it is easy to pick a good quantization step size to meet the quality requirement. It is shown by experimental results that the two new schemes outperform the original H.264 switching scheme in the sense that they can achieve prompt stream switching without noticeable quality degradation, and a small amount of bit rate overhead is demanded only when switching occurs.
    机译:研究了以不同质量等级和比特率编码的压缩视频流之间的流切换,并且在这项工作中提出了两种针对H.264视频的增强流切换方案。通过引入主要和次要SP / SI图片,以牺牲编码效率为代价实现了原始H.264流切换方案的灵活性。相反,在我们的增强方案中,不对原始压缩流进行任何修改,从而在切换点处保持编码效率。当发生切换时,这两种新方案以不同的方式使用新的图片类型,称为差异图片(DIFF),以补偿参考帧的不匹配。差异图片可以被有效地编码,并且容易选择良好的量化步长来满足质量要求。实验结果表明,在可以实现快速流切换而没有明显质量下降的意义上,这两种新方案优于原始的H.264交换方案,并且仅在发生切换时才需要少量的比特率开销。

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