opencv picture size 0x0 is invalid

edit

I try to take video stream (live stream) from a cam with rtsp protocol, saying that on windows works perfectly but linux does not want to leave, the code is as follows:

 import cv2

if __name__ == "__main__":
    # find the webcam
    capture = cv2.VideoCapture(0)
   frame_width = int(capture.get(3))
   frame_height = int(capture.get(4))
    # video recorder
    fourcc = cv2.cv.CV_FOURCC(*'XVID')  # cv2.VideoWriter_fourcc() does not exist
    videoOut = cv2.VideoWriter("output.avi", fourcc, 20.0, (frame_width, frame_height))

    # record video
    while (capture.isOpened()):
        ret, frame = capture.read()
        if ret:
            videoOut.write(frame)
            cv2.imshow('Video Stream', frame)

        else:
            break

        # Tiny Pause
        key = cv2.waitKey(1)

    capture.release()
    videoOut.release()
    cv2.destroyAllWindows()

return this error: picture size 0x0 is invalid