中文说明：视频转换为图片,把视频的每一帧转换为JPG或者其他类型的图片，更有利于后续的视频图像处理，方便后续对前景目标的提取算法
English Description：
Video is converted into pictures, and every frame of video is converted into JPG or other types of pictures, which is more conducive to the subsequent video image processing and the subsequent foreground object extraction algorithm