title: VideoCapture can open a video but then after some second or minute cap.read​() keeps returning false
body: <p>While accessing live-streaming IP camera.
  VideoCapture can open a video but then after some second or minute can't read it. <code>cap.read​()</code> keeps returning false and frame is none after some time.
  FPS rate of that camera is 180000. This is so high.</p>
  <p>Python-&gt; 3.8.5 (default, Jul 28 2020, 12:59:40)
  [GCC 9.3.0] on linux
  OS- Ubuntu (18.04 or 20.04)
  OpenCV - 4.4.0
  opencv-contrib-python==4.4.0.46</p>