如何在pytq5中发布Opencv打开的网络摄像头？

Question

我想点击一个按钮开始捕捉帧，然后点击另一个按钮释放网络摄像头，让我重做这个过程。

但是当我在下面运行此代码并单击按钮时会出现问题：

import cv2

...
self.StartVideo.clicked.connect(self.startVideo)
...

def startVideo(self):
    self.StartVideo.setDisabled(True)

    self.cap = cv2.VideoCapture(0)
    self.cap.release()

系统崩溃并说Process完成退出代码139（被信号11中断：SIGSEGV）

然后我试着这样：

import cv2

...
self.StartVideo.clicked.connect(self.startVideo)
self.StartVideo.clicked.connect(self.closeVideo)
...

def startVideo(self):

    from Video_Analysis.video_threads import video_thread

    self.videoThread = video_thread()
    self.videoThread.start()

def closeVideo(self):
    self.videoThread.stop()

Video_Analysis.video_threads.py是：

# -*- coding: utf-8 -*-
from PyQt5 import QtWidgets, QtGui, QtCore
import threading
import numpy as np
from time import sleep
import cv2


class video_thread(QtCore.QThread):
# finishSignal_frame = QtCore.pyqtSignal(list)
# finishSignal_mark = QtCore.pyqtSignal(np.ndarray)

  def __init__(self, parent=None):
    super(video_thread, self).__init__(parent)
    self.cap = cv2.VideoCapture(0)

  def run(self):
    self.cap.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, 320)
    self.cap.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, 240)
    self.cap.set(cv2.cv.CV_CAP_PROP_FPS, 30)
    while True:
        ret, frame = self.cap.read()
        rgbImage = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
        convertToQtFormat = QtGui.QImage(rgbImage.data, rgbImage.shape[1], rgbImage.shape[0],
                                         QtGui.QImage.Format_RGB888)
        convertToQtFormat = QtGui.QPixmap.fromImage(convertToQtFormat)
        pixmap = QtGui.QPixmap(convertToQtFormat)

  def stop(self):
    self.cap.release()
    self.terminate()

但问题是一样的，我怎么能这样呢？

非常感谢！