如何在opencv中使用cv：：VideoCapture：：waitAny

int cv::VideoCapture::waitAny(std::vector<cv::VideoCapture>& captures, int timeout = 0)

#include <opencv2/opencv.hpp>
#include <iostream>

int main() {
    std::vector<cv::VideoCapture> captures;
    captures.push_back(cv::VideoCapture("video1.mp4"));
    captures.push_back(cv::VideoCapture("video2.mp4"));

    while (true) {
        int index = cv::VideoCapture::waitAny(captures, 1000); // 等待1秒钟
        if (index >= 0) {
            cv::Mat frame;
            captures[index].read(frame);
            if (!frame.empty()) {
                cv::imshow("Video", frame);
                cv::waitKey(1);
            }
        } else {
            std::cout << "Timeout reached." << std::endl;
        }
    }

    return 0;
}