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Moving Picture Algorithm Implementation of xAVS Encoder and Overall Performance Optimization

Author: LiRuiGang
Tutor: LiuYanLong
School: Taiyuan University of Technology
Course: Communication and Information System
Keywords: AVS xAVS Scene change TS stream
CLC: TN919.81
Type: Master's thesis
Year: 2010
Downloads: 47
Quote: 1
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Abstract


AVS is the second generation source coding standard with independent intellectual property rights in China, has advanced, autonomy, openness three characteristics. , AVS is implemented in the software aspects of the Working Group reference software, reference software, however, there is less than on the program structure and module implements is not conducive to the promotion of AVS. The development of a performance, reasonable structure AVS encoder is particularly urgent and important. This topic is the AVS Workgroup response in this context requires the development of open-source encoder xAVS. The subject in the serious study AVS1-P2 standard (AVS video) on the basis of development of performance encoder xAVS, mainly to complete the following tasks: (1) to develop a the target task xAVS encoder xAVS goal task is developed based on x86 platform, AVS video standard high-performance encoder. Support a variety of media tablets source compression, support for rate control and rate-distortion optimization, can be encapsulated as standard TS stream. Implement the design of the algorithm (2) moving image interframe coding scheme, the program mode selection and coding processing units of macroblocks, interpolation and filtering wait for the entire frame macroblock encoding is completed in units of frames processing. Skip mode in the mode selection, characterized in, using the judgment in advance of the Skip mode. This method eliminates the need for a large number of time-consuming operations, and improves the encoding speed. Tested, xAVS encoder outperforms reference software rm52j. (3) The scene change detection scene change occurs in the P-frame encoding quality will be significantly reduced, P frame scene change detection algorithm is proposed to solve this problem. By the encoding preset parameters calculated upper and lower switching threshold, the threshold value of the scaling factor of intra prediction consideration. Comparing the current frame the interframe prediction block and the intra-prediction block substituting the value of size to detect scene switching frame as a scene switching when the interframe consideration is greater than the intra consideration i.e. again with I frame encoding, and not vice versa, the scene switching frame. (4) TS stream package to analyze the the AVS video streams and the organizational structure of the TS stream, by parsing the the AVS code stream sequence start code and picture start code, the PES header is added before these two starting code. TS stream in the PES packet according to the organizational structure of TS stream 188B packet data to fill in the corresponding additional information package. TS stream can be packaged in STORM (3.09.12.16 later) play. Further, in order to fit in the DSP on the transplantation, the subject also to the separation of the I, P, B frames. Image type determination of the large number of the macro-block layer is extracted to the image layer, the Delete Irrelevant frame type code, and thereby improve the CACHE hit rate. In summary, this paper developed and developed performance xAVS encoder. National Engineering Laboratory testing of Peking digital video encoding technology, xAVS encoder is superior the AVS the reference software rm52j, not less than the x264. Shanxi Province Science and Technology Department of science and technology achievement appraisal, xAVS encoder reached the international advanced level. Focus group in 2009, as the AVS Working Group xAVS development team won the AVS Working Group 2009 \

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