Research And Design Of MPEG-2 To AVS Video Transcoder

Currently there are a variety of encoding standards in different cases, aiming at different application evelopments occasion in video communications, in which MPEG-2 standard established by ISO/IEC has been widely applied in immobility multimedia communication and has huge accumulation in hardware, software and multimedia data storage. MPEG-2 data is not applicable in many cases, such as wireless mobile networks and wireless video conferencing system. Compared with MPEG-2, AVS has higher coding efficiency, can support wider use and property rights and doesn't have the trouble of patents right and so on. So, convert lots of MPEG-2 video stream directly to AVS Video stream is a most effective solution.Firstly in this tesis, the video transcoding technology research background and current status of research is introduced, the main content and our main tasks is proposed.Secondly, the MPEG-2 and AVS video coding standard, particularly the MPEG-2 decoding process and the AVS encoding process are researched. Through a comparative analysis similarities and differences between the two standards are found, which supplies knowledge reserves with the design of the transcoding device from MPEG-2 to AVS.Thirdly, the structure and properties of several mainstream video transcoding devices are briefly analyzed and compared. Aiming at the similarities and differences between MPEG-2 and AVS standards, an improved, based on the pixel field and cascade transcoding program from MPEG-2 to AVS video stream. On the same time, the key technology sectors and the algorithm used in achieving transcoding process is detailed analyzed and discussed.Fourthly, in order to shorten the time to transcode and improve code quality, the performance of the AVS encoder is optimized. After the analysis of the computational time of each module, aiming at the largest amount of computation, the most time-consuming and patterns choice, a fast algorithm is proposed.Finally, the PEG-2 AVS video transcoding system is implemented in this paper, in which the research and improved algorithm are appplied reasonably. Through the test, the fact that the program of this paper greatly accelerates the rate of transcoding and takes into account the video quality after transcoding is demonstrated.