Dealing with the disappearance of QVideoProbe and QCameraViewfinder in Qt 6.x

[Francky033]

Hello,
Under Qt 5.x, I was using QVideoProbe to get images from a camera. Unfortunately, this function has disappeared in version 6.x

const QList<QCameraInfo> cameras = QCameraInfo::availableCameras();

if (!cameras.empty())
{
	camera_sensor = new QCamera(QCamera::BackFace);

	if (camera_sensor)
	{
		viewfinder = new QCameraViewfinder();

		if (viewfinder)
	       {
			camera_sensor->setViewfinder(viewfinder);
		        camera_sensor->setCaptureMode(QCamera::CaptureStillImage);

			videoProbe = new QVideoProbe(this);

			if (videoProbe->setSource(camera_sensor)) {
				// Probing succeeded, videoProbe->isValid() should be true.
				connect(videoProbe, SIGNAL(videoFrameProbed(QVideoFrame)),
													this, SLOT(recupererImagesCamera(QVideoFrame)));
			}

			camera_sensor->start();
			// Viewfinder frames should now also be emitted by
			// the video probe, even in still image capture mode.
			// Another alternative is to install the probe on a
			// QMediaRecorder connected to the camera to get the
			// recorded frames, if they are different from the
			// viewfinder frames.
	}
}

I try painfully to go through the QVideoSink class but without success.

const QList<QCameraDevice> cameras = QMediaDevices::videoInputs();

if (!cameras.empty())
{
        camera_sensor = new QCamera(QCameraDevice::BackFace);

	if (camera_sensor)
	{
		viewfinder = new QVideoSink(this);

		if (viewfinder)
	       {
        		videoFrame = new QMediaCaptureSession();

			videoFrame->setCamera(camera_sensor);

			videoFrame->setVideoSink(viewfinder);

			connect(viewfinder, &QVideoSink::videoFrameChanged,
				this, &QWinStars3View::recupererImagesCamera2);
											
		}
     }
}

I try painfully to go through the QVideoSink class but without success.

Thanx !

[Bonnie]

Hello, have you checked the Camera Example came with Qt installation?
From my understanding, we use a QVideoWidget as the viewfinder (preview widget), and you don't need to create a QVideoSink because QVideoWidget already have one.
So should be something like

viewfinder = new QVideoWidget(this);
videoFrame = new QMediaCaptureSession();
videoFrame->setCamera(camera_sensor);
videoFrame->setVideoOutput(viewfinder);
connect(viewfinder->videoSink(), &QVideoSink::videoFrameChanged, this, &QWinStars3View::recupererImagesCamera2);
camera_sensor->start();

If you don't need a preview widget, then use QVideoSink only as in your code. Seems that should work after you start the camera.

[Francky033]

Thanks Bonnie!

It works perfectly (I will use QVideoSink )!

Have a great day!