text: import cv2
  import numpy as np
  import time
  
  class Webcam(object):
      def __init__(self):
          #print ("WebCamEngine init")
          self.dirname = "" #for nothing, just to make 2 inputs the same
          self.cap = None
  
      def start(self):
          print("[INFO] Start webcam")
          time.sleep(1) # wait for camera to be ready
          self.cap = cv2.VideoCapture('http://192.168.0.146:4747/mjpegfeed?640x480')
          self.valid = False
          try:
              resp = self.cap.read()
              self.shape = resp[1].shape
              self.valid = True
          except:
              self.shape = None
  
      def get_frame(self):
  
          if self.valid:
              _,frame = self.cap.read()
              frame = cv2.flip(frame,1)
              # cv2.putText(frame, str(self.cap.get(cv2.CAP_PROP_FRAME_WIDTH)),
              #           (65,220), cv2.FONT_HERSHEY_PLAIN, 2, (0,256,256))
          else:
              frame = np.ones((480,640,3), dtype=np.uint8)
              col = (0,256,256)
              cv2.putText(frame, "(Error: Camera not accessible)",
                         (65,220), cv2.FONT_HERSHEY_PLAIN, 2, col)
          return frame
  
      def stop(self):
          if self.cap is not None:
              self.cap.release()
              print("[INFO] Stop webcam")
  
  