PYQT5 webcam is not opening on the label

Question

I am trying to set my webcam to a label and open it on pageload. However code does not throw any error also it does not getting bind to the label as well. Can anyone tell me how to fix this?

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'camera.ui'
#
# Created by: PyQt5 UI code generator 5.15.2
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow,qApp
import sys
import cv2

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayoutWidget = QtWidgets.QWidget(self.centralwidget)
        self.gridLayoutWidget.setGeometry(QtCore.QRect(169, 59, 471, 251))
        self.gridLayoutWidget.setObjectName("gridLayoutWidget")
        self.gridLayout = QtWidgets.QGridLayout(self.gridLayoutWidget)
        self.gridLayout.setContentsMargins(0, 0, 0, 0)
        self.gridLayout.setObjectName("gridLayout")

        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)


        self.label = QtWidgets.QLabel(self.gridLayoutWidget)
        self.label.setObjectName("label")
        self.gridLayout.addWidget(self.label, 0, 0, 1, 1)
        self.capture = cv2.cv2.VideoCapture(0)
        timer = QtCore.QTimer()
        timer.setInterval(int(1000/30))
        timer.timeout.connect(self.get_frame)
        timer.start()        

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)


    def get_frame(self):
        frame = self.capture.read()
        image = QtGui.QImage(frame, *frame.shape[1::-1], QtGui.QImage.Format_RGB888).rgbSwapped()
        pixmap = QtGui.QPixmap.fromImage(image)
        self.label.setPixmap(pixmap)



    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
      


class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

Answer 1

The problem is that timer is a local variable that will be destroyed so the get_frame method will not be invoked, the solution is to make it a member of the class so you must change timer to self.timer. Also the read() method returns a tuple, no the frame so you should change it to:

def get_frame(self):
    ret, frame = self.capture.read()
    if ret:
        image = QtGui.QImage(
            frame, *frame.shape[1::-1], QtGui.QImage.Format_RGB888
        ).rgbSwapped()
        pixmap = QtGui.QPixmap.fromImage(image)
        self.label.setPixmap(pixmap)