qCamera

[Negar_mg]

Hi
I'm new to qt
I wanted to see the camera image using qcamera in my application. I was able to get the camera image using the example for c ++, now I want to take a photo and record video, the qt example was a bit complicated in this case, please help .
I used opencv before, when I used it, I could use the frame to take photos and record video, but I can't find the frame on my qcamera.

[SGaist]

Hi,

Do you mean that example ?

[Negar_mg]

@SGaist
yes,i try it ,But the video recording did not work
and the code is complicated for me.

[SGaist]

Which platform are you on ?

As for the complexity of this example, what exactly is the issue ?

[Negar_mg]

@SGaist said in qCamera:

Which platform are you on ?
As for the complexity of this example, what exactly is the issue ?

I am using qt creator in Windows. In opencv I take a photo using a frame and record video, but in this example I do not know how to record video.
Example qt on my system only takes pictures and does not record any video.
I also found the following code, but this code does not record video either:

   #include "mainwindow.h"
   
   #include "ui_mainwindow.h"
   
   
   
   MainWindow::MainWindow(QWidget *parent) :
   
   	QMainWindow(parent),
   
   	ui(new Ui::MainWindow)
   
   {
   
   	ui->setupUi(this);
   
   
   
   	connected = false;
   
   	recording = false;
   
   	camera = new QCamera();
   
   
   
   	qDebug() << QCameraInfo::availableCameras().count();
   
   
   
   	QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
   
   	foreach (const QCameraInfo &cameraInfo, cameras)
   
   	{
   
   		qDebug() << cameraInfo.deviceName() << cameraInfo.description() << cameraInfo.position();
   
   
   
   		ui->deviceSelection->addItem(cameraInfo.description());
   
   	}
   
   }
   
   
   
   MainWindow::~MainWindow()
   
   {
   
   	delete ui;
   
   }
   
   
   
   void MainWindow::connectCamera()
   
   {
   
   	QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
   
   	foreach (const QCameraInfo &cameraInfo, cameras)
   
   	{
   
   		qDebug() << cameraInfo.description() << ui->deviceSelection->currentText();
   
   
   
   		if (cameraInfo.description() == ui->deviceSelection->currentText())
   
   		{
   
   			camera = new QCamera(cameraInfo);
   
   			viewfinder = new QCameraViewfinder(this);
   
   			camera->setViewfinder(viewfinder);
   
   			ui->webcamLayout->addWidget(viewfinder);
   
   
   
   			connect(camera, SIGNAL(error(QCamera::Error)), this, SLOT(cameraError(QCamera::Error)));
   
   
   
   			connected = true;
   
   			ui->connectButton->setText("Disconnect");
   
   
   
   			camera->start();
   
   
   
   			return;
   
   		}
   
   	}
   
   }
   
   
   
   void MainWindow::on_connectButton_clicked()
   
   {
   
   	if (!connected)
   
   	{
   
   		connectCamera();
   
   	}
   
   	else
   
   	{
   
   		camera->stop();
   
   		viewfinder->deleteLater();
   
   		ui->connectButton->setText("Connect");
   
   		connected = false;
   
   	}
   
   }
   
   
   
   void MainWindow::on_captureButton_clicked()
   
   {
   
   	if (connected)
   
   	{
   
   		imageCapture = new QCameraImageCapture(camera);
   
   		camera->setCaptureMode(QCamera::CaptureStillImage);
   
   		camera->searchAndLock();
   
           imageCapture->capture("E:/image.jpg");
   
   		camera->unlock();
   
   	}
   
   }
   
   
   
   void MainWindow::on_recordButton_clicked()
   
   {
   
   	if (connected)
   
   	{
   
   		if (!recording)
   
   		{
   
   			recorder = new QMediaRecorder(camera);
   
   			connect(recorder, SIGNAL(error(QMediaRecorder::Error)), this, SLOT(cameraError(QCamera::Error)));
   
   			camera->setCaptureMode(QCamera::CaptureVideo);
   
   			recorder->setOutputLocation(QUrl(qApp->applicationDirPath()));
   
   			recorder->record();
   
   			recording = true;
   
   		}
   
   		else
   
   		{
   
   			recorder->stop();
   
   			recording = false;
   
   		}
   
   	}
   
   }
   
   
   
   void MainWindow::cameraError(QCamera::Error error)
   
   {
   
   	qDebug() << error;
   
   
   
   	connected = false;
   
   	camera->stop();
   
   	ui->connectButton->setText("Connect");
   
   }
   
   
   
   void MainWindow::recordError(QMediaRecorder::Error error)
   
   {
   
   	qDebug() << recorder->errorString();
   
   }

Please tell me what is used to record video and photos instead of frames?
Why is no video recorded in this code or in the qcamera example?

[jsulm]

@Negar_mg said in qCamera:

Example qt on my system only takes pictures and does not record any video

You need to switch to "Video" tab in that example

[Negar_mg]

@jsulm
it's Inactive.How do I enable it?

[jsulm]

@Negar_mg If you check https://code.qt.io/cgit/qt/qtmultimedia.git/tree/examples/multimediawidgets/camera/camera.cpp?h=5.15 you will see

ui->captureWidget->setTabEnabled(1, (m_camera->isCaptureModeSupported(QCamera::CaptureVideo)));

So, it sets the "Video" tab to enabled if m_camera->isCaptureModeSupported(QCamera::CaptureVideo) returns true. It looks like for your camera it returns false. I don't know what you can do to change this.
Does your camera support video recording?

[Negar_mg]

@jsulm
I tested this camera with opencv and it had no problem,
On the other hand, I tested this program on a laptop, with a webcam, and it was the same.
Is it possible that the problem is using Windows?

[jsulm]

@Negar_mg It should work.
What Qt version and compiler do you use?

[Negar_mg]

@jsulm
qt creator 4.15.0
kit=qt 5.12.11 MSVC2015 64bit

[jsulm]

@Negar_mg Can you try with more recent version (5.15.2)?

[Negar_mg]

@jsulm
I'm trying now.

[Negar_mg]

My program only has these kits. Can it be added to the new kit?

[jsulm]

@Negar_mg said in qCamera:

Can it be added to the new kit?

Yes, install current Qt version for your compiler, then you should get a new Kit automatically.
If you used Qt Online Installer to install Qt, then you can use Qt Maintenance Tool (you can find it in the root folder of your Qt set-up, c:\qt).

[Negar_mg]

This post is deleted!

[Negar_mg]

Thank you for your help
I used Qt_5_15_2-Debug, but the part related to video recording is still inactive.
I encountered this error while using this kit:
Unsupported media type: "{32595559-0000-0010-8000-00AA00389B71}"