H.264/AVC-to-SVC temporal video transcoder for video broadcasting in wireless networks

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• 作者：R. Garrido-Cantos ; J. De Cock ; J. L. Martínez…
• 关键词：Wireless video broadcasting ; Scalable video coding (SVC) ; H.264/AVC ; Transcoding
• 刊名：Multimedia Tools and Applications
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：75
• 期：1
• 页码：497-525
• 全文大小：1,965 KB
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  26.Van Leuven S, De Cock J, Van Wallendael G, Van de Walle R, Garrido-Cantos R, Martinez J.L, Cuenca P (2011) Combining Open − and Closed-loop Architectures for H.264/AVC-to-SVC Transcoding. Proceedings of 18th IEEE International Conference on Image Processing, pp. 1661–1664, Brussels, Belgium
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• 作者单位：R. Garrido-Cantos (1)
  J. De Cock (2)
  J. L. Martínez (1)
  S. Van Leuven (2)
  P. Cuenca (1)
  A. Garrido (1)
  
  1. Albacete Research Institute of Informatics, University of Castilla-La Mancha Campus Universitario s/n, 02071, Albacete, Spain
  2. Department of Electronics and Information Systems, Ghent University-iMinds, Gaston Crommenlaan 8, bus 201, 9050, Ledeberg, Ghent, Belgium
  
• 刊物类别：Computer Science
• 刊物主题：Multimedia Information Systems
  Computer Communication Networks
  Data Structures, Cryptology and Information Theory
  Special Purpose and Application-Based Systems
  
• 出版者：Springer Netherlands
• ISSN：1573-7721

文摘

Over the last few decades multimedia usage has changed dramatically, with networks and terminals of diverse bandwidths and capabilities coexisting. To ensure a good quality of experience, this diverse environment requires adaptability of the video stream. If video streams were compressed using Scalable Video Coding (SVC) schemes, they would be able to adapt to these heterogeneous networks and a wide range of terminals. However, since the majority of multimedia contents are compressed using H.264/AVC, they cannot benefit from this scalability. This paper makes some proposals for improving a temporal H.264/AVC-to-SVC video transcoder so that it can convert an H.264/AVC bitstream without scalability to scalable bitstreams with temporal scalability. The idea behind the proposed transcoder is to accelerate interprediction, focusing on reducing the coding complexity of the mode decision and motion estimation tasks of the encoder stage by using information available after the H.264/AVC decoding stage. To accelerate the mode decision task, a decision tree for narrowing down the Macroblock (MB) types to be checked by the SVC encoder has been developed. On the other hand, to accelerate the motion estimation task, a reduced area is created dynamically for every MB and sub-MB. Moreover, time savings increase considerably when both proposals are adjusted to work together, as opposed to doing so in an isolated way. The results show that when our joint proposal is applied, the complexity is reduced by 98 % while maintaining coding efficiency.