通过文件夹选择窗口选择所需播放的视频文件，然后逐帧在axes中显示出来，相当于实现了逐帧播放视频的功能。-Folder selection window to select the desired video file to play, and fr a me-by-fr a me displayed in the axes, the equivalent of the video fr a me-by-fr a me playback.