import cv2
import os
for item in os.listdir('data/video'):
    video = 'data/video/' + '/' + item
    vc = cv2.VideoCapture(video)  # 读入视频文件
    ret, frame = vc.read()
    name = 1
    timeF = 5  # 5帧采取一次
    while ret:
        cv2.imshow("video", frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            vc.release()
            break
        if name % timeF == 0:
            cv2.imwrite("data/crop_ok_video/" + item.split('.')[0] + '_' +str(name) + '.jpg', frame) # 写入文件夹
        name += 1
        ret, frame = vc.read()