Design Of The Embedded Multimedia Transmission System Based On MPEG-4

With the high-speed development of Intenret, the mankind strides into a brand-new information age. As the theme of this age, the multimedia communication combining with video, audio and data is concerned by more and more people. Multimedia transmission system is produced by the combination of computer technology, electronic technology and automation technology, and the critical technique is the multimedia compression technology. Now there are many international standards about multimedia compressions, e.g.MPEG-1/2/4, H.26X. MPEG-4 is the latest standard by the ISO MPEG. It covers the applications from very low bitrate to broadcast equality video. This multimedia transmission system combines embedded technology and MPEG-4 compression coding technology, must be a good prospects for the application and development. It can be widely used in image communications, video surveillance, Network streaming media, IPTV areas and so on.In this paper, an embedded multimedia transmission system based on MPEG-4 is designed. In this systerm, the audio and video data are processed according to the MPEG-4 specification which has the high division and low bitrate, and the embedded Linux is selected as our embedded OS.Firstly, this paper has introduced the concept, development trend and application of multimedia communication. Then, MPEG-4 video compression coding standard has been analysed, in which composition, codecs structure and codecs principle have been mostly described. And the implementation model of MPEG-4 simple video coding has been given. In the embedded operating system, it has given the reasons of choosing linux. Then it expounded the start-up and function of the u-boot in this system. The video processing is the focus of the multimedia system, so the video processing of this system has been done a detailed description. It put forward the software design and API of the VIA,ITU Input,ITU Output,MPEG-4 Encoder and MPEG-4 Decoder module. Finally, the main research conclusions summarized, the prospect of further research work is also made.