grab_mjpeg_frame.py

#!/usr/bin/env python
import socket
import sys
import base64

if len(sys.argv) != 7:
    print "Usage: %s host port request user password destfile.jpg" % sys.argv[0]
    sys.exit(1)

host = sys.argv[1]
port = sys.argv[2]
request = sys.argv[3]
user = sys.argv[4]
password = sys.argv[5]
filename = ''.join(sys.argv[6].split('.')[:-1])
filename_ext = sys.argv[6].split('.')[-1]

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, int(port)))
fh = s.makefile()

# Request
fh.write(('GET ' + request + ' HTTP/1.1\r\n'
+'Host: ' + host+':'+port + '\r\n'
+'Connection: keep-alive\r\n'
+'Authorization: Basic ' + base64.b64encode(user+':'+password) + '\r\n\r\n'
))
fh.flush()

# Response
line = fh.readline()
while line.strip() != '': 
    parts = line.split(':')
    if len(parts) > 1 and parts[0].lower() == 'content-type':
        # Extract boundary string from content-type
        content_type = parts[1].strip()
        boundary = content_type.split(';')[1].split('=')[1].strip('"')
    line = fh.readline()

if not boundary:
    raise Exception("Can't find content-type")

n = 0
while True :
  # Seek ahead to the first chunk
  while line.strip() != "--" + boundary:
      line = fh.readline()
  
  # Read in chunk headers
  while line.strip() != '': 
      parts = line.split(':')
      if len(parts) > 1 and parts[0].lower() == 'content-length':
          # Grab chunk length
          length = int(parts[1].strip())
      line = fh.readline()
  
  # Write image
  image = fh.read(length)
  output_filename = "{0}{1:020d}.{2}".format(filename, n, filename_ext)
  print output_filename
  with open(output_filename, 'w') as out_fh:
      out_fh.write(image)

  n += 1

s.close()

これを参考に、Qwatch の後継品 TS-WLC2 (digest認証) 版を書きました。
https://gist.github.com/goingmywaynet/e5caea360a1f87cd0fe1