| Video surveillance has been developed for a long time as a security method. Digital video surveillance has been an important domain nowadays. Products for surveillance recording system is required to be networked, with high resolution and low bit rate. Meanwhile, embedding technology is potential in surveillance systems. People now take attention on the standard which can involve the most advanced technology. More humanistic multimedia standard, which includes current advanced technology, is being paid attention to. Among these standards, H.263, MJPEG, MPEG-1, MPEG-2 are already mature. While the H264 and MPEG-4 are the standards being researched with great attention. Accord MPEG-4, the image can be with DVD quality and its data stream is much lower than MPEG-2's. The product with embedded MPEG-4 system is already having VCD image quality. Thus, multi-channel MPEG-4 surveillance recording system with high resolution, excellent stability and low cost, which is developed by using embedding technology, can gain the technology advantage in the world but also with great rivalship. I, as the author of this thesis, studied and researched video surveillance technology in-depth and mainly designed and debugged the system on VWEB platform. Meanwhile, I learnt earnestly multi-media compression standard MPEG-4, paid most attention on its second part (video encoding/decoding) and realized software's decoding and playing on client. Main functions for client software are resolving and demuxing input system bit stream to audio/video stream, decoding audio/video stream, playing audio/video data and audio/video synchronous. Finally, I succeeded to play 4 channels MPEG-4 video stream with D1 format real-timely on P4 PC. Based on fact situation of surveillance system, the thesis briefly introduces video basis, multi-media standards and encoding/decoding method. Meanwhile, it gives prominence to my working such as system structure, realization decoding for video and decoding playing for client system etc. |
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