title: decode and show H.264 chucked video sequence with python from pi camera
body: <p>I would like to decode the H.264 video sequences and show them on the screen. The video sequences are from the pi camera and I capture with the following code</p>
  
  <pre><code>import io
  import picamera
  
  stream = io.BytesIO()
  while True:
      with picamera.PiCamera() as camera:
          camera.resolution = (640, 480)
          camera.start_recording(stream, format='h264', quality=23)
          camera.wait_recording(15)
          camera.stop_recording()
  </code></pre>
  
  <p>Is there any way to decode the sequence of 'stream' data and show them with the opencv or other python libraries? </p>