一个摄像头捕获的类，可以自动枚举摄像头和声卡以及音频和视频编码器进行编码生成Avi文件-a camera caught the category, Enumerating automatic camera and sound cards, and audio and video encoder to encode documents generated Avi

camera的yuv数据转h264，然后h264解码本地显示-encode yuv from camera to h264, then decode h264 and display in rgb