Try to set my camera fps to 60

FullFullTwist

Hello,

I try to create a little software to see my webcam and record them.

My camera is a OBSBOT meet 2 and this camera can record to 1920*1080 at 60fps.

But in my software, the video is in 1920*1080 but at 30 FPS and same FPS when I record.

I've miss something?

   // Recherche de la caméra spécifiée
    for (const QCameraDevice &cameraDevice : cameras) {
        if (cameraDevice.description() == "OBSBOT Meet 2 StreamCamera") {
            camera = new QCamera(cameraDevice);

            // Parcourir les formats pour trouver 1920x1080 à 60 FPS
            const QList<QCameraFormat> formats = cameraDevice.videoFormats();
            bool formatFound = false;
            for (const QCameraFormat &format : formats) {
                if (format.resolution() == QSize(1920, 1080) && format.minFrameRate() >= 60.0) {
                    camera->setCameraFormat(format);
                    qDebug() << "Format appliqué : 1920x1080 à 60 FPS";
                    formatFound = true;
                    break;
                }
            }
            if (!formatFound) {
                qDebug() << "Format 1920x1080 à 60 FPS non trouvé. Utilisation du format par défaut.";
            }

            // Configurer la session de capture
            captureSession.setCamera(camera);
            captureSession.setVideoOutput(ui->videoWidget);

            // Initialiser l'enregistreur
            mediaRecorder = new QMediaRecorder;
            captureSession.setRecorder(mediaRecorder);

            // Définir le taux d'images par seconde dans les paramètres de l'enregistreur
            QMediaRecorder::Quality quality = QMediaRecorder::VeryHighQuality;
            mediaRecorder->setQuality(quality);
            qDebug() << "Qualité d'enregistrement définie : Très haute";

            // Démarrer la caméra
            camera->start();
            qDebug() << "Camera démarrée avec la résolution et fréquence définies.";
            break;
        }
    }

SGaist

Hi and welcome to devnet,

Which version of Qt ?
On which OS ?

FullFullTwist

Hi,

Qt 6.8 on Windows 11

SGaist

What formats do you get from Qt Multimedia ?

FullFullTwist

Hello,
Sorry for delay :)

I've try something else, this is the new code:

#include "MainWindow.h"
#include <QCameraDevice>
#include <QMediaMetaData>
#include <QCameraFormat>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    // Setup camera and video widget
    camera = new QCamera(this);
    videoWidget = new QVideoWidget(this);
    captureSession = new QMediaCaptureSession(this);
    captureSession->setCamera(camera);
    captureSession->setVideoOutput(videoWidget);

    // Layout
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(videoWidget);

    // Combobox for video formats
    formatComboBox = new QComboBox(this);

    // Populate the combo box with supported formats
    populateFormats();

    layout->addWidget(formatComboBox);

    // Current format label
    currentFormatLabel = new QLabel("Current Format: ", this);
    layout->addWidget(currentFormatLabel);

    // Connect combobox to slot
    connect(formatComboBox, QOverload<int>::of(&QComboBox::currentIndexChanged), this, &MainWindow::onFormatChanged);

    QWidget *centralWidget = new QWidget(this);
    centralWidget->setLayout(layout);
    setCentralWidget(centralWidget);

    // Start the camera
    camera->start();
}

MainWindow::~MainWindow()
{
}

void MainWindow::populateFormats()
{
    const QList<QCameraFormat> formats = camera->cameraDevice().videoFormats();
    for (const QCameraFormat &format : formats) {
        QString formatDescription = QString("Resolution: %1x%2, Pixel Format: %3, Frame Rate: %4 fps")
        .arg(format.resolution().width())
            .arg(format.resolution().height())
            .arg(format.pixelFormat())
            .arg(format.maxFrameRate());
        formatComboBox->addItem(formatDescription, QVariant::fromValue(format));
    }
}

void MainWindow::onFormatChanged(int index)
{
    QCameraFormat selectedFormat = formatComboBox->currentData().value<QCameraFormat>();
    camera->setCameraFormat(selectedFormat);
    QString formatDescription = QString("Resolution: %1x%2, Pixel Format: %3, Frame Rate: %4 fps")
                                    .arg(selectedFormat.resolution().width())
                                    .arg(selectedFormat.resolution().height())
                                    .arg(selectedFormat.pixelFormat())
                                    .arg(selectedFormat.maxFrameRate());
    currentFormatLabel->setText("Current Format: " + formatDescription);
}

With this code, if I selected format with 60fps, nothing change, it's seems the video saty on 30 fps