即使在Opencv中使用waitKey()和destroyAllwindows()之后，窗口也会冻结 [英] Window freezing even after using waitKey() and destroyAllwindows() in Opencv

问题描述

环境

OS-薄荷Linux，使用opencv3.1，通过anaconda使用spyder

OS- mint Linux, using opencv3.1,using spyder through anaconda

问题

下面提到的代码将打开一个名称框窗口，并显示通过便携式摄像机捕获的视频.但是，如代码中所述，当我按"q"键时，它将停止并终止该窗口.但是，在此窗口停止显示捕获的任何其他帧，并且不会终止.然后手动强制退出该过程.

The code mentioned below opens a window of name frame and display the video captured through laptop camera.But when I press 'q', as mentioned in code, it should stop and terminate the window. But,here the window stops to display any further frames captured and do not terminates.then manually I force Quit the process.

有什么问题，为什么不终止窗口?

What is the problem, why is it not terminating the window?

代码:-

import cv2

import numpy as np

cap = cv2.VideoCapture(0)

while(True):

        ret, frame = cap.read()

        cv2.imshow('frame',frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break

cap.release()

cv2.destroyAllWindows()

推荐答案

此问题有一个未解决的错误:

There is an open bug with this issue:

https://github.com/opencv/opencv/issues/7343

还有类似的问题，没有好的解决方案:

There are also similar questions without a good solution:

当断开相机连接时，opencv videocapture挂起/冻结返回"False"

在此处尝试解决方案: DestroyWindow可以在Mac上使用Python和OpenCV关闭窗口多次调用waitKey似乎对许多人都有效.您也可以尝试不使用release()

Try the solutions here: DestroyWindow does not close window on Mac using Python and OpenCV Calling several times waitKey seems to work for many people. You can try without the release() as well

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