opencv-python同时调用两个摄像头

import cv2
import numpy as np

capture = cv2.VideoCapture(0)
capture_usb = cv2.VideoCapture(2)
# 打开自带的摄像头
if capture.isOpened() and capture_usb.isOpened():
    # 以下设置显示屏的宽高
    capture.set(cv2.CAP_PROP_FRAME_WIDTH, 640)
    capture.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)
    capture_usb.set(cv2.CAP_PROP_FRAME_WIDTH, 640)
    capture_usb.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)

    # 持续读取摄像头数据
    while True:
        read_code, frame = capture.read()
        read_code2, frame2 = capture_usb.read()
        if not read_code or not read_code2:
            break
        c = np.concatenate((frame, frame2), axis=1)
        cv2.imshow("screen_title", frame)
        cv2.imshow("screen_title_usb", frame2)
        cv2.imshow("c", c)
        # 输入 q 键，保存当前画面为图片
        if cv2.waitKey(1) == ord('q'):
            # 设置图片分辨率
            frame = cv2.resize(frame, (1920, 1080))
            cv2.imwrite('pic.jpg', frame)
            capture_usb.release()
            break
    # 释放资源
    capture.release()
    cv2.destroyWindow("screen_title")