python size(0)_错误：（-215）函数imsh中的size.width0size.height0

程序需要读取视频，计算帧数，然后在窗口中显示。错误发生在视频结束后。

我该怎么解决？

来源如下：import tkMessageBox

import cv2

banner = cv2.imread('../data/banner.png')

video = cv2.VideoCapture('../data/pintado_real_crop.avi')

contadorDeFrames = True

contador = 0

cv2.imshow('Projeto Pacu', banner)

cv2.moveWindow('Projeto Pacu', 100,50)

while(contadorDeFrames == True):

contadorDeFrames, frame = video.read()

contador = contador + 1

cv2.imshow("Video", frame)

cv2.moveWindow('Video', 100, 178)

print"Frame: %d" %contador

k = cv2.waitKey(30) & 0xff

if k == 27:

break

tkMessageBox.showinfo("Frames contador: %d" %contador)

video.release()

cv2.destroyAllWindows()

完全错误：OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file /build/buildd/opencv-2.4.8+dfsg1/modules/highgui/src/window.cpp, line 269

Traceback (most recent call last):

File "/home/vagner/PycharmProjects/TesteVideo/src/TestaVideo.py", line 20, in

cv2.imshow("Video", frame)

cv2.error: /build/buildd/opencv-2.4.8+dfsg1/modules/highgui/src/window.cpp:269: error: (-215) size.width>0 && size.height>0 in function imshow

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