视频的压缩算法。本例子暂时只实现了静态的视频压缩功能。如果想实现实时的语音、视频通信，而且语音视频要同步；如果想保存成avi动画，还得啃那些cap打头的函数们。-Video compression algorithms. This example implements only the static moment of video compression. If you want to achieve real-time voice, video communications, and voice and video to be synchronized　If you want to save as avi animations, have to bite that starts with a function of their cap.