在QLabel中显示视频

Question

我正尝试在QT Creator中显示QLabet格式的视频。我正在用openCV看视频。下面是我的代码：

mainwindow.cpp

#include "includes.h"
#include "vidreadthread.h"


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    VidReadThread *thread1 = new VidReadThread("Video read thread");
    thread1->start();
}

MainWindow::~MainWindow()
{
    delete ui;
}

vidreadthread.cpp

#include "vidreadthread.h"
#include "includes.h"

using namespace cv;
extern MainWindow *mainPtr;

VidReadThread::VidReadThread(QString s) : name(s)
{
}

void VidReadThread::run()
{
    QThread::msleep(100);
    VideoCapture cap;
    cap.open("helicopter_with_stickers.mp4");
    while(1)
    {
        Mat image1;
       // Capture frame-by-frame
        cap >> image1;

       // If the frame is empty, break immediately
       if (image1.empty())
         break;

       QImage image2 = QImage((uchar*) image1.data, image1.cols, image1.rows, image1.step, QImage::Format_RGB888);
       mainPtr->ui->label1->setPixmap(QPixmap::fromImage(image2));
    }
}

我可以显示视频，但我不能设置帧率。整个60秒的视频在4-5帧内完成。我只用OpenCV对cvWaitkey()的帧率有命令，但在这里msleep()似乎不适用于类似的应用程序。请建议一种不跳帧的方法。我做了一个vidreadthread，这样图形用户界面就不会在读取视频时挂起。

如果有任何其他方法可以让我在QT UI中显示OpenCV窗口，那么也请推荐。

Answer 1

尝试移动到线程可能工作得更好

.cpp

for (int i = 0; i<Camera::getCameraCount();)
        ui->comboBox->addItem(QString::number(i++)); //name camera
    camera = new Camera();
    camera->moveToThread(&thread); 

connect(this, SIGNAL(cameraOperate(int)), camera, SLOT(Operate(int))); 
connect(camera, SIGNAL(updateImage(QImage)), this, SLOT(updateImage(QImage))); 


void app0::updateImage(QImage image)
{
    ui->videoviewer->setPixmap(QPixmap::fromImage(image));
}

相机线程：

void Camera::Operate(int _index)
{
    if (open(_index)) { qDebug() << "Camera open success!";}
    else { qDebug() << "Camera open failed!"; return; }
    if (capture.get(28) == -1) { cout << "get 28 -1" << "\n";emit }
    while (1)
    {
        qApp->processEvents();
        Mat matin = read(); //read mat
        matnow = matin;
        QImage image = Mat2QImage(matin);
        emit updateImage(image);
    }
}

链接：https://blog.csdn.net/Sun_tian/article/details/104236327