Question

我面临的问题是，当我尝试使用Videowriter保存图像时，它会创建视频文件但大小为0.我创建了一个标题，声明了一个保存视频的功能和一个单独的.cpp文件定义函数。当我只在一个文件中编写整个代码而不是像以前一样包含ViceoCapture和VideoWriter时，它运行正常，甚至可以保存具有适当文件大小的视频文件。

当我开始调试时，我发现每次收到一个帧但VideoWriter.open为null或者说没有为opencv_highgui.dll加载符号

**savevideo.cpp file**
#include"SaveVideo.h"


int CSaveVideo::savevideo()//string InpVideo, int pinstatus)
{
    VideoCapture oVcam(0);


    Mat vFrame;
    string OutPath = "C:\\Users\\20080031\\Desktop\\";
    string Filename = "Vout.avi";
    int vfourcc = CV_FOURCC('M', 'J', 'P', 'G');
    int vfps = 20;
    VideoWriter oVWrite;
    oVWrite.open(Filename, vfourcc, vfps, Size(480, 640), true);

    if (!oVcam.isOpened())
    {
        cout << "Camera not opened" << endl;
    }
    while (1)
    {
        oVcam.read(vFrame);
        imshow("Input", vFrame);
        waitKey(1);
        oVWrite.write(vFrame);

    }



}
CSaveVideo::CSaveVideo()
{
    cout << "Inside Constructor" << endl;
}
CSaveVideo::~CSaveVideo()
{
    //VideoCapture Vcam0;
    cout << "Inside Distructor" << endl;
    //Vcam0.release();
}
 **saveVideo.h**
#ifndef SAVEVIDEO_H
#define SAVEVIDEO_H

#include<iostream>
#include<stdio.h>
#include<string>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#include<opencv2/core/core.hpp>
#include <opencv2\opencv.hpp>



using namespace std;
using namespace cv;


class CSaveVideo
{
public:
    CSaveVideo();
    ~CSaveVideo();

    //string m_sGPIOpinstatus;
    //char m_cSTOP;

    int savevideo();//string PinStatus, char End,  );
};
#endif SAVEVIDEO_H
**main.cpp**
#include"SaveVideo.h"


int main()
{
    CSaveVideo save;
    save.savevideo();
    /*cout << out<<endl;*/
    return 0;
}

Answer 1

最好使用这种格式 -

VideoWriter oVidWrite;
int nframe_width = oVidCap.get(CV_CAP_PROP_FRAME_WIDTH);
int nframe_height = oVidCap.get(CV_CAP_PROP_FRAME_HEIGHT);
string str_Path = "video.avi";
int fps = 30;

oVidWrite.open(str_Path, CV_FOURCC('M', 'J', 'P', 'G'), fps, Size(nframe_width, nframe_height), true);

使用videowriter opencv，视频大小为0字节

1 个答案: