采用线程播放视频内容，防止界面卡死

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#  窗体对应的逻辑部分
class videoWindow(Ui_videoForm,QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(videoWindow, self).__init__(parent)
        self.setupUi(self)

    def videoprocessing(self):
      # print("gogo")
        global videoName #在这里设置全局变量以便在线程中使用
        videoName,videoType= QFileDialog.getOpenFileName(self.pushButton_choose,
                                    "选择视频",
                                    '常用路径',
                                                         #*.mp4;;*.avi;;
                                    " All Files (*)")
        #cap = cv2.VideoCapture(str(videoName))
    def playvideo(self):
        th = Thread(self)
        th.changePixmap.connect(self.setImage)
        th.start()

    def setImage(self, image):
        self.label_image.setPixmap(QPixmap.fromImage(image))

#采用线程来播放视频
class Thread(QThread):

    changePixmap = pyqtSignal(QtGui.QImage)
    def run(self):
        cap = cv2.VideoCapture(videoName)
        print(videoName)
        while (cap.isOpened()==True):
            ret, frame = cap.read()
            if ret:
                rgbImage = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
                convertToQtFormat = QtGui.QImage(rgbImage.data, rgbImage.shape[1], rgbImage.shape[0], QImage.Format_RGB888)#在这里可以对每帧图像进行处理，
                p = convertToQtFormat.scaled(600, 600, Qt.KeepAspectRatio)
                self.changePixmap.emit(p)
                time.sleep(0.01) #控制视频播放的速度
            else:
                break