code: def playMovie(self):
      
      if self.state == self.READY:
        # Create a new thread to listen for RTP packets
        print "Playing Movie"
        threading.Thread(target=self.listenRtp).start()
        self.playEvent = threading.Event()
        self.playEvent.clear()
        self.sendRtspRequest(self.PLAY)
docs: Play button handler.