简单介绍一下视频的存储格式与基本操作方法。一个视频由很多帧的图片构成，当逐帧播放这些图片时，类似放电影形成连续动态的视频效果。从数学表达上来看，存储于计算机中的视频，可理解为一个3维数据，其中代表视频帧的长，宽，代表视频帧的帧数(Briefly describes the video storage format and basic methods of operation. A video is made up of pictures from many frames. When frames are played by frame, similar movies are used to form continuous, dynamic video effects. From the point of view of mathematical expression, stored in the computer's video, can be understood as a 3 dimensional data, which represent the video frame is long, wide, representative video frame number)