pyqt5 获取网络摄像头

在使用pyqt5获取网络摄像头时，可以使用OpenCV库来读取摄像头的帧，并将其绘制在pyqt控件上。以下是一个示例代码：

import cv2
from PyQt5 import QtGui, QtCore

class MainWindow(QtWidgets.QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()

        self.label_show_camera = QtWidgets.QLabel(self)
        self.label_show_camera.setFixedSize(640, 480)

        self.timer_camera = QtCore.QTimer()
        self.timer_camera.timeout.connect(self.show_camera)

        self.cap = cv2.VideoCapture("your_camera_url")  # 用网络摄像头的URL替换"your_camera_url"
        self.timer_camera.start(30)

    def show_camera(self):
        flag, self.image = self.cap.read()
        show = cv2.resize(self.image, (640, 480))
        show = cv2.cvtColor(show, cv2.COLOR_BGR2RGB)
        showImage = QtGui.QImage(show.data, show.shape[1], show.shape[0], QtGui.QImage.Format_RGB888)
        self.label_show_camera.setPixmap(QtGui.QPixmap.fromImage(showImage))

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()
    sys.exit(app.exec_())

请注意，你需要将"your_camera_url"替换为实际的网络摄像头URL。此代码将创建一个界面，并将网络摄像头的视频流显示在名为`label_show_camera`的控件上。