i changed code , but actually streaming was stopped without any breakpoint (in debugging mode in VS2019)
def gen_frames(Ip): # generate frame by frame from camera
camera = cv2.VideoCapture('http://'+ Ip +':8080/stream/video.mjpeg')
camera.set(cv2.CAP_PROP_BUFFERSIZE, 0)
assert camera.isOpened()
while True:
success, image = camera.read()
if not success:
break
ret, jpeg = cv2.imencode('.jpg', image)
frame = jpeg.tobytes()
yield (b'--frame\r\n'
b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n\r\n')