import os
import requests

def do_load_media(url, path):
  try:
    headers = {
      "User-Agent": "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Maxthon/4.3.2.1000 Chrome/30.0.1599.101 Safari/537.36"}
    pre_content_length = 0
    # 循环接收视频数据
    while True:
      # 若文件已经存在，则断点续传，设置接收来需接收数据的位置
      if os.path.exists(path):
        headers['Range'] = 'bytes=%d-' % os.path.getsize(path)
      res = requests.get(url, stream=True, headers=headers)

      content_length = int(res.headers['content-length'])
      # 若当前报文长度小于前次报文长度，或者已接收文件等于当前报文长度，则可以认为视频接收完成
      if content_length < pre_content_length or (
          os.path.exists(path) and os.path.getsize(path) == content_length):
        break
      pre_content_length = content_length

      # 写入收到的视频数据
      with open(path, 'ab') as file:
        file.write(res.content)
        file.flush()
        print('receive data，file size : %d  total size:%d' % (os.path.getsize(path), content_length))
  except Exception as e:
    print(e)


def load_media():
  url = 'http://k.youku.com/player/getFlvPath/sid/051446875256330ba12be_00/st/flv/fileid/030002080056EECA04F69A03BAF2B1BBADCA22-B1B9-E915-C03B-B0E7B0726C73?K=ae8e9a4d0f294dce282cef20&hd=0&myp=0&ts=377&ypp=0&ctype=30&ev=1&token=3759&oip=826403039&did=9e701e2baea8d466300184129d27d5d8&ep=AqAHzTJcifjAG0w8gO6bow3Mo5jVCyWrke5yFUQ5ZxOD3KGnS9WeSH2XvfdzTgOmgcPdl%2BVjzD29GUC%2BqeDjFxCFXBPHdIgGvhDtKk064s9iV0vxt4B0XNY39jlBH%2BCK'
  path = r'E:/test.mp4'
  do_load_media(url, path)
  pass


def main():
  load_media()
  pass


if __name__ == '__main__':
  main()