ffmpeg裁剪视频，提取关键帧_ffmpeg 裁剪掉关键帧之后

import os.path as osp
import os

def mkdir_if_missing(d):
    if not osp.exists(d):
        os.makedirs(d)
if __name__ == '__main__':
    for i in range(1, 28):
        input_video_path = 'E:/ysz/' + str(i) + '.mp4'
        result_root='E:/ysz/' + str(i)
        mkdir_if_missing(result_root)
        output_video_path = osp.join(result_root, str(i) + '_r.mp4')
        crop_cmd_str ='ffmpeg -i {} -vf crop=iw/2:ih:960:0 {}'.format(input_video_path,output_video_path)
        os.system(crop_cmd_str)
        keyframe_cmd_str="ffmpeg -i {} -vf select='eq(pict_type\,I)' -vsync 2 -s 960*1080 -f image2 {}/%05d.jpg".format(output_video_path,result_root)
        print(keyframe_cmd_str)
        os.system(keyframe_cmd_str)
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