OpenCV VideoWriter 无法打开

OpenCV是一款功能强大的计算机视觉库，可以用于图像和视频处理。其中，VideoWriter是OpenCV中的一个类，用于将图像序列写入视频文件。然而，有时候我们可能会遇到VideoWriter无法打开的问题。在本文中，我们将探讨这个问题，并提供解决方案。

cpp
int fourcc = cv::VideoWriter::fourcc('X', 'V', 'I', 'D');
cv::VideoWriter writer("output.avi", fourcc, 30, cv::Size(640, 480));

cpp
std::cout << "Image sequence size: " << imageSequence.size() << std::endl;

cpp
std::ifstream file("output.avi");
if (!file) {
    std::cout << "File does not exist!" << std::endl;
}

cpp
#include 
int main() {
    cv::VideoCapture capture(0);
    if (!capture.isOpened()) {
        std::cout << "Failed to open camera!" << std::endl;
        return -1;
    }
    int fourcc = cv::VideoWriter::fourcc('X', 'V', 'I', 'D');
    cv::VideoWriter writer("output.avi", fourcc, 30, cv::Size(640, 480));
    if (!writer.isOpened()) {
        std::cout << "Failed to open VideoWriter!" << std::endl;
        return -1;
    }
    cv::Mat frame;
    while (capture.read(frame)) {
        writer.write(frame);
        cv::imshow("Video", frame);
        if (cv::waitKey(1) == 'q') {
            break;
        }
    }
    capture.release();
    writer.release();
    cv::destroyAllWindows();
    return 0;
}