| This paper deeply discuss the video and audio real-time processing technology and its optimize technology of low bits rate communication systems. The system has been realized with software. Video compression are based on the H.263 algorithm, audio compression are based on the H.723 algorithm, data transmit by RS code and RTF protocol.At first this paper discuss the method of audio and video signal encoder, optimize the motion estimate and DCT modules with MMX technology. A new diamond search algorithm for fast-matching motion estimation is proposed to replace the traditional three-step search algorithm in the motion estimation region. Experiments results demonstrate that the application on the new diamond search algorithm optimized by MMX has magnificently improved the efficiency of compression ratio and computing speed. Then it is dicussed that how to capture and play and synchronize the video and audio data with software. Error correcting code are also discussed, the RS code has been used to correcting code. It has put forward a kind of method of self-adaptation based on motion characteristic to correcting error code. Finally, based on the RTP protocol, real-time transmission of video and audio data is realized with software, and a bandwidth control algorithm based on RTP is introduced.The research results of this paper can be used in the long-distance education, video conference, videophone, video real-time control, and various kinds of communication systems. It has greater research value and extensive practical value. |
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