title: rtsp method SETUP failed: 461 Client error
body: <p>I am trying to read rtsp live stream using python opencv I am getting following errors</p>
  
  <blockquote>
    <p>[rtsp @ 000001f610c828a0] method SETUP failed: 461 Client error</p>
    
    <p>warning: Error opening file (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:856)
    warning: rtsp://192.168.1.18:8554/cam (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:857)</p>
  </blockquote>
  
  <pre><code>cap = cv2.VideoCapture("rtsp://192.168.1.18:8554/cam",cv2.CAP_FFMPEG)
  if cap.isOpened():
      cv2.namedWindow("demo", cv2.WINDOW_AUTOSIZE)
      while True:
              ret_val, img = cap.read();
              cv2.imshow('demo',img)
              cv2.waitKey(10)
  else:
      print("camera open failed")
  
  cv2.destroyAllWindows()
  </code></pre>
  
  <p>I am using python 3.5 and opencv 3.4.2</p>