Grab/videomanger.cpp

#include "videomanger.h"

#include <QImage>
#include <QList>
#include <QString>


#include <random>

VideoManger::VideoManger(QObject *parent/* = nullptr*/) : QObject(parent),
    framesPerSecound(25)
{

}

bool VideoManger::makeVideo(/*QList<QImage> *frames, */QString outputName, int count)
{
//    if(frames->isEmpty())
//        return false;
    if(outputName.isEmpty()){
        srand(time(nullptr));
        outputName = QString(QString::number(rand() % 200 + 10));
    }

    // counts the size of one frame
    frameSize = cv::imread(outputName.toStdString() + std::to_string(1) + ".png").size();

    // init videoWriter
    videoWriter = cv::VideoWriter(outputName.toStdString() + "1.avi", cv::VideoWriter::fourcc('M', 'J', 'P', 'G'),
                framesPerSecound, frameSize, true);

    // record frames in a video file

    for(int i = 0; i < count; ++i){
//        frame = QImageToCvMat(frames->at(i), CV_8UC3);
//        cv::imshow("qwe", frame);
        frame = cv::imread(outputName.toStdString() + std::to_string(i + 1) + ".png");
        videoWriter.write(frame);
    }

    emit videoSaved();
    return true;
}

// convert QImage to cv;;mat
cv::Mat VideoManger::QImageToCvMat(QImage frame, int format)
{
    return cv::Mat(frame.height(), frame.width(), format,
                   const_cast<uchar*>(frame.bits()),
                   frame.bytesPerLine()).clone();
}