PyQt5 window automatically closes after running for a few seconds - "Process finished with exit code -1073741819 (0xC0000005)"

I am trying to make a desktop application with PyQt5 which utilizes the webcam. I saw a YouTube video in which the guy used threading to achieve that. I modified the code for my use case. The modified code is below: -

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import cv2


class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Ayyo")

        self.GL = QGridLayout()

        self.feedLabel = QLabel()
        self.GL.addWidget(self.feedLabel, 0, 0, 1, 2)

        self.lineEdit = QLineEdit()
        self.GL.addWidget(self.lineEdit, 1, 0, 1, 1)

        self.button1 = QPushButton("Confirm")
        self.button1.clicked.connect(self.confirm)
        self.GL.addWidget(self.button1, 1, 1, 1, 1)

        self.textEdit = QTextEdit()
        self.GL.addWidget(self.textEdit, 2, 0, 2, 1)

        self.button2 = QPushButton("Clear")
        self.button2.clicked.connect(self.clear)
        self.GL.addWidget(self.button2, 2, 1, 1, 1)

        self.button3 = QPushButton("Copy")
        self.GL.addWidget(self.button3, 3, 1, 1, 1)

        self.webcam = Webcam()
        self.webcam.start()
        self.webcam.ImageUpdate.connect(self.ImageUpdateSlot)

        self.setLayout(self.GL)

        self.show()

    def ImageUpdateSlot(self, image):
        self.feedLabel.setPixmap(QPixmap.fromImage(image))

    def confirm(self):
        current = self.textEdit.toPlainText()
        self.textEdit.setPlainText(current + self.lineEdit.text())

    def clear(self):
        self.textEdit.setPlainText("")


class Webcam(QThread):
    ImageUpdate = pyqtSignal(QImage)
    
    def run(self):
        self.ThreadActive = True
        vid = cv2.VideoCapture(0)

        while True:
            ret, frame = vid.read()
            frame1 = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
            image = QImage(frame1, frame1.shape[1], frame1.shape[0], frame1.strides[0], QImage.Format_RGB888)
            self.ImageUpdate.emit(image)


app = QApplication(sys.argv)
mw = MainWindow()
# mw.show()
sys.exit(app.exec_())

When I run this, the actual program runs fine but it automatically closes after a few seconds with

Process finished with exit code -1073741819 (0xC0000005)

Blockquote

The strange thing is while debugging the code in PyCharm, it didn't close. But whenever I run the code, it automatically closes after a few seconds. Any help would be appreciated.

These are always difficult to troubleshoot, but I have found that you should avoid using QThreads while initializing the application as it sometimes causes random shutdowns.

Try:

• Initialize the application and show it.
• Run the webcam Class (although I suggest you replace this with a function)

If you want to have this feature threaded so it doesn't lock the UI, take a look at QThreadPool for PyQt5 (https://www.mfitzp.com/tutorials/multithreading-pyqt-applications-qthreadpool/)