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Research and Implementation for Multithread AVS Video Bitstream Transcoder Based on DirectShow

Author: YuYang
Tutor: SuFuLin
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: Video transcoding AVS DirectShow Parallel Process
CLC: TN919.81
Type: Master's thesis
Year: 2009
Downloads: 46
Quote: 0
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Abstract


Digital video is much better than analog video, the development of digital video accelerates the development of multimedia, video communication and digital TV. Many international video compression standards have been established for various applications and periods. These standards have many differences on syntax, resolution, bitrate and compression efficiency. The corresponding transmission media and the ability of terminal processing are different too. The technology of video transcoding solves these problems and makes the communication between different system and terminals seamlessly. The transcoding of compressed bitstreams is to transcode a compressed video stream from one format or standard to another.Based on heterogeneous transcoding, the transcoding between main types of video compression, including MPEG-2, and AVS, whose intellectual property is owned by our country, is researched in this paper. What’s more, based on the DirectShow technology and multithread programming method in VC++ language, the transcoding system is implemented on PC.First of all, based on the decoding cores of DirectShow technology and the method we talked about in this thesis, we have carried out decode operation of most main stream types of video compression, including MPEG-2. Also, the method based on multithread programming is studied and various links in the architecture of the transcoding system are harmonized so that the design of high speed transcoder is realized on the PC with dual-processors. The Parallel Processing transcoder decodes the next frame and encodes thecurrent frame at the same time which can save almost 40% transcoding time compared to the traditional method of serial process.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Image communication, multimedia communication > Image coding
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