# -*- coding: utf-8 -*-
"""以python模块形式存储、使用二进制文件"""
import os
import base64
from io import BytesIO
def bin2module(bin_file, py_file=None):
  """二进制文件转存为python模块
  bin_file  - 二进制文件名
  py_file   - 生成的模块文件名，默认使用二进制文件名，仅更改后缀名
  """
  fpath, fname = os.path.split(bin_file)
  fn, ext = os.path.splitext(fname)
  if not py_file:
    py_file = os.path.join(fpath, '%s.py'%fn)
  with open(bin_file, 'rb') as fp:
    content = fp.read()
  content = base64.b64encode(content)
  content = content.decode('utf8')
  with open(py_file, 'w') as fp:
    fp.write('# -*- coding: utf-8 -*-\n\n')
    fp.write('import base64\n')
    fp.write('from io import BytesIO\n\n')
    fp.write('content = """%s"""\n\n'%content)
    fp.write('def get_fp():\n')
    fp.write('  return BytesIO(base64.b64decode(content.encode("utf8")))\n\n')
    fp.write('def save(file_name):\n')
    fp.write('  with open(file_name, "wb") as fp:\n')
    fp.write('    fp.write(base64.b64decode(content.encode("utf8")))\n')
if __name__ == '__main__':
  """测试代码"""
  # 将图像文件转存为img_demo.py
  bin2module('forever.png', 'demo.py')
  # 导入刚刚生成的demo模块
  import demo
  # 用pillow打开图像，验证demo模块的get_fp()：返回二进制的IO对象（类文件对象）
  from PIL import Image
  im = Image.open(demo.get_fp())
  im.show()
  # 保存为本地文件，验证demo模块的save()：保存文件
  demo.save('demo_save.png')

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为间隔多少帧截取一张图片
  parser.add_argument('--skip_frame', dest='skip_frame', help='skip number of video', default=100, type=int) #此处可更改提取帧的间隔
  args = parser.parse_args(['--input','','--output',''])  #此处添加路径，input为输入视频的路径 ，output为输出存放图片的路径
  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)