使用 opencv 和 Qt 录制视频

Posted 2023-02-14

【中文标题】使用 opencv 和 Qt 录制视频

【英文标题】：Video record using opencv and Qt

【发布时间】：2017-04-20 20:35:45

【问题描述】：

我似乎在代码中找不到错误。代码编译完美，我可以开始视频，但我无法录制视频。

图像输出窗口

视频文件在所需目录中创建，但只有 10 kb。我已经尝试将four_cc更改为MPEG仍然没有效果。

#include "camerafeed.h"
#include "ui_camerafeed.h"
#include <opencv2/highgui.hpp>
#include <opencv2/opencv.hpp>
#include <opencv/cv.h>

#include <QtCore>

using namespace cv;
using namespace std;
bool recording = false;



camerafeed::camerafeed(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::camerafeed)

    ui->setupUi(this);
    cap1.open(0);

    Starttrigger = new QTimer(this);
//    connect(Starttrigger,SIGNAL(timeout()),this,SLOT(processGui()));




camerafeed::~camerafeed()

    delete ui;


void camerafeed::processGui()

    int fcc =   CV_FOURCC('D','I','V','X');
    int fps =   20;

    cap1.read(frame1);

    Size frameSize(cap1.get(CV_CAP_PROP_FRAME_WIDTH),cap1.get(CV_CAP_PROP_FRAME_HEIGHT));
    string filename1 = "D:\\Camera1\\video1.avi";
    writer1 = VideoWriter(filename1,fcc,fps,frameSize);

    bool bSuccess = cap1.read(frame1);

    if(recording==true)
    
        writer1.write(frame1);
        putText(frame1,"[REC]",Point(0,30),5,1,Scalar(0,0,225));

    

    cv::cvtColor(frame1,frame1,CV_BGR2RGB);

    QImage qframe1((uchar*)frame1.data,frame1.cols,frame1.rows,frame1.step,QImage::Format_RGB888);

    ui->camera1->setPixmap(QPixmap::fromImage(qframe1));


void camerafeed::on_Start_clicked()

    Starttrigger->start(20);
    connect(Starttrigger,SIGNAL(timeout()),this,SLOT(processGui()));



void camerafeed::on_stop_clicked()

    Starttrigger->stop();

    recording =  false;
    disconnect(Starttrigger,SIGNAL(timeout()),this,SLOT(processGui()));



void camerafeed::on_record_clicked()

    recording   =   !recording;

【参考方案1】：

您的代码的一个问题是您正在使用该功能重新启动视频对象，我建议您仅在按下开始按钮时运行它。为此，最好创建一个执行此操作的函数。

CameraFeed::CameraFeed(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)

    ui->setupUi(this);
    isRecorded = false;
    trigger = new QTimer(this);
    connect(trigger, &QTimer::timeout, this, &CameraFeed::processGui);


void CameraFeed::initCamera()

    cap.open(0);
    if(cap.isOpened())
    
        qDebug() << "Camera successfully connected.";
    


void CameraFeed::initVideo()

    std::string filename =  "video.avi";
    int fcc =   CV_FOURCC('D','I','V','X');
    int fps =   20;
    cv::Size frameSize(cap.get(CV_CAP_PROP_FRAME_WIDTH),cap.get(CV_CAP_PROP_FRAME_HEIGHT));
    writer = cv::VideoWriter(filename,fcc,fps,frameSize);


void CameraFeed::processGui()

    if(cap.read(frame))
        cv::cvtColor(frame,frame,CV_BGR2RGB);
        if(isRecorded)
        
            writer.write(frame);
            cv::putText(frame,"[REC]",cv::Point(0,30),5,1,cv::Scalar(0,0,225));
        

        QImage qframe((uchar*)frame.data,frame.cols,frame.rows,frame.step,QImage::Format_RGB888);

        ui->camera1->setPixmap(QPixmap::fromImage(qframe));
    



void CameraFeed::on_start_clicked()

    initCamera();
    trigger->start(100);


void CameraFeed::on_stop_clicked()

    if(cap.isOpened())
    
        // Disconnect camera
        cap.release();
        qDebug() << "Camera successfully disconnected.";
    
    trigger->stop();


void CameraFeed::on_record_clicked()

    isRecorded = !isRecorded;
    if(isRecorded)
        initVideo();

完成code

【讨论】：

感谢解决了我的问题，但 isRecorded 必须是全局变量

全局是什么意思？

如果我在设置中初始化了 isRecorded，我无法在 CameraFeed::on_record_clicked() 中访问它，所以我不得不在外面声明它

IsRecorded 是该类的成员，您已在github.com/eyllanesc/***/tree/master/CameraFeed查看完整代码

哦，我没有看到完整的代码。谢谢 。只有这对我来说就足够了