使用opencv将视频写入文件时出现问题

Trouble writing video to file using opencv

本文关键字：问题 文件 opencv 视频 使用      更新时间：2023-10-16

我正试图在visualstudio2013中使用C++中的OpenCV将捕获的视频写入文件。程序似乎可以从我笔记本电脑上的网络摄像头捕捉视频，还可以为每帧保存一张图像，但当我将帧写入视频文件时，我最终会得到一个6kb的文件。程序没有给我任何错误，因为我已经遵循了OpenCV文档中的说明。

我正在粘贴程序以供审查。请建议我如何使它成为一个成功的项目。

谢谢。

#include <stdio.h>
#include <iostream>
#include "opencv2corecore.hpp"
#include "opencv2highguihighgui.hpp"
using namespace std;
using namespace cv;
int main()
{
    VideoCapture video_capture(0);
    if (!video_capture.isOpened())
    {
        cout << "Error in opening video feed!" << endl;
        getchar();
        return -1;
    }
    // Creating the window to view video feed
    String window_name = "Video_Feed";
    namedWindow(window_name, CV_WINDOW_AUTOSIZE);
    //
    Mat frame;
    // Filename
    String filename = "...\first_recording.avi";
    // four character code
    int fcc = CV_FOURCC('M', 'P', '4', '2');
    // frames per sec
    int fps = 10;
    // frame size
    Size frame_size(CV_CAP_PROP_FRAME_WIDTH, CV_CAP_PROP_FRAME_HEIGHT);
    VideoWriter video_writer = VideoWriter(filename,fcc,fps,frame_size,true);
    if (!video_writer.isOpened())// || video_writer.isOpened == NULL)
    {
        cout << "Error in opening video writer feed!" << endl;
        getchar();
        return -1;
    }
    int frame_count = 0;
    while (frame_count < 100)
    {
        bool cap_success = video_capture.read(frame);
        if (!cap_success)
        {
            cout << "Error in capturing the image from the camera feed!" << endl;
            getchar();
            break;
        }
        imshow(window_name, frame);
        //imwrite("cap.jpg", frame);
        video_writer.write(frame);
        switch (waitKey(10))
        {
        case 27:
            return 0;
            break;
        }
        frame_count++;
    }
    //scvReleaseVideoWriter;
    destroyWindow(window_name);
    return 0;
}

请找到下面的一段代码来编写视频文件。

 int main(int argc, char* argv[])
    {
        // Load input video
        cv::VideoCapture input_cap("test8.avi");
        if (!input_cap.isOpened())
        {
            std::cout << "!!! Input video could not be opened" << std::endl;
            return -1;
        }
    // Setup output video
    cv::VideoWriter output_cap("output.avi",  
                               input_cap.get(CV_CAP_PROP_FOURCC),
                               input_cap.get(CV_CAP_PROP_FPS), 
                               cv::Size(input_cap.get(CV_CAP_PROP_FRAME_WIDTH), input_cap.get(CV_CAP_PROP_FRAME_HEIGHT)));
    if (!output_cap.isOpened())
    {
        std::cout << "!!! Output video could not be opened" << std::endl;
        return -1;
    }
    // Loop to read frames from the input capture and write it to the output capture
    cv::Mat frame;
    while (true)
    {       
        if (!input_cap.read(frame))             
            break;
        output_cap.write(frame);
    }
    // Release capture interfaces   
    input_cap.release();
    output_cap.release();
    return 0;
}
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