视频解码芯片SAA7113和视频编码芯片SAA7121初始化配置，一路模拟视频信号从SAA7113输入，转换为数字信号，然后SAA7121把数字信号转化为模拟信号输出-Video decoding chip SAA7113 video encoder chip SAA7121 initial configuration, all the way analog video signal from the SAA7113 input, converted to digital signals, th