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首页> 外文期刊>Multimedia, IEEE Transactions on >Architectures for Fast Transcoding of H.264/AVC to Quality-Scalable SVC Streams
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Architectures for Fast Transcoding of H.264/AVC to Quality-Scalable SVC Streams

机译：将H.264 / AVC快速转码为可缩放质量的SVC流的体系结构

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摘要

The scalable extension of H.264/AVC (SVC) was recently standardized, and offers scalability at a minor penalty in rate-distortion efficiency when compared to single-layer H.264/AVC coding. In SVC, a scaled version of the original video sequence can easily be extracted by dropping layers from the stream. However, most of the video content nowadays is still produced in a single-layer format. While decoding and reencoding is a possible solution to introduce scalability in the existing bitstreams, this is an approach which requires a tremendous amount of time and effort. In this paper, we show that transcoding can be used to intelligently derive scalable bitstreams from existing single-layer streams. We focus on SNR scalability, and introduce techniques that are able to create multiple quality layers in the bitstreams. We also discuss bitstream rewriting from SVC to H.264/AVC, and examine how our newly proposed architectures can benefit from the changes that were introduced for bitstream rewriting. Architectures with different rate distribution flexibility and computational complexity are discussed. Rate-distortion performance of transcoding is shown to be comparable to that of reencoding at a fraction of the time needed for the latter.
机译：H.264 / AVC（SVC）的可扩展性扩展最近得到了标准化，与单层H.264 / AVC编码相比，它在速率失真效率上付出了很小的代价就提供了可扩展性。在SVC中，可以通过从流中删除图层来轻松提取原始视频序列的缩放版本。但是，当今大多数视频内容仍以单层格式制作。尽管解码和重新编码是在现有比特流中引入可伸缩性的可能解决方案，但这是一种需要大量时间和精力的方法。在本文中，我们证明了转码可用于从现有的单层流中智能地获取可伸缩的位流。我们专注于SNR可伸缩性，并介绍能够在比特流中创建多个质量层的技术。我们还将讨论从SVC到H.264 / AVC的比特流重写，并研究我们新提出的体系结构如何从比特流重写引入的更改中受益。讨论了具有不同速率分配灵活性和计算复杂度的体系结构。结果表明，代码转换的速率失真性能与重新编码的速率失真性能相当，后者所需的时间却很少。

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