args = parser.parse_args(['--input',r'F:\data_video\IMG_4395.MOV','--output',r'F:data_rgb_pic\7video'])

import cv2
import argparse
import os
def parse_args():
 """
 Parse input arguments
 """
 parser = argparse.ArgumentParser(description='Process pic')
 parser.add_argument('--input', help='video to process', dest='input', default=None, type=str)
 parser.add_argument('--output', help='pic to store', dest='output', default=None, type=str)
 #default為間隔多少幀截取一張圖片
 parser.add_argument('--skip_frame', dest='skip_frame', help='skip number of video', default=100, type=int)
 #input為輸入視頻的路徑 ，output為輸出存放圖片的路徑
 args = parser.parse_args(['--input','','--output',''])
 return args
 
def process_video(i_video, o_video, num):
 cap = cv2.VideoCapture(i_video)
 num_frame = cap.get(cv2.CAP_PROP_FRAME_COUNT)
 expand_name = '.jpg'
 if not cap.isOpened():
  print("Please check the path.")
 cnt = 0
 count = 0
 while 1:
  ret, frame = cap.read()
  cnt += 1
  # how
  # many
  # frame
  # to
  # cut
  if cnt % num == 0:
   count += 1
   cv2.imwrite(os.path.join(o_video, str(count) + expand_name), frame)
 
  if not ret:
   break
 
if __name__ == '__main__':
 args = parse_args()
 if not os.path.exists(args.output):
  os.makedirs(args.output)
 print('Called with args:')
 print(args)
 process_video(args.input, args.output, args.skip_frame)