VideoCapture返回一个空帧，但保存到磁盘时是一个合适的帧？

Question

video=cv2.VideoCapture('video.avi')
success,frame=video.read()

# when the frame is printed it prints an array with all 0's
print(frame)

# But it is a proper image when saved to disk
cv2.imwrite("frame.jpg",frame)

代码打印出一个0的numpy数组，但保存到计算机时会显示正确的图像

Answer 1

您可以检查“框架是否为空”和“成功是否返回？”，然后您可以将其保存在安全状态。

video=cv2.VideoCapture('video.avi')
success,frame=video.read()

if(success and !(frame.empty())):      
    print(frame)
    cv2.imwrite("frame.jpg",frame)
else:
    print("empty frame")