QGraphicsView ImageCapture and Video Record Start Hangs Camera Stream

nikita.panchal09

Hi,

I am having iMX6 development kit with CMOS-MIPI-OV5640. The kit is having Debian Stretch 9.5.

At present, I am trying to Capture Image and Record Video using QT (QCamera with QGraphicsView). I have developed sample code for that and it is working fine with the laptop(ubuntu 16.04) and it's webcam.
But on IMX6 development kit, It hangs the live stream and crashes with below cases.

While ImageCapture, It hangs after capturing Image
While Record Start, It hangs with mediarecorder->record().

Please find code related to camera:

QGraphicsVideoItem *recVideoItem = new QGraphicsVideoItem();
QGraphicsScene *scene = new QGraphicsScene(this);
scene->addItem(recVideoItem);
ui->graphicsView->setScene(scene);

QCamera *camera = new QCamera(this);
camera->setViewfinder(recVideoItem);
camera->setCaptureMode(QCamera::CaptureVideo);

//Image Capture Initialize
QCameraImageCapture *imageCapture = new QCameraImageCapture(camera);

//MediaRecorder Initialize
QMediaRecorder* mediaRecorder = new QMediaRecorder(camera);
connect(mediaRecorder, SIGNAL(durationChanged(qint64)),this, SLOT(updateRecordTime()));

//Start Camera
ui->graphicsView->show();
camera->start();

//Capture Image
void MainWindow::on_captureImage_clicked() {
static int count = 0;
scene->clearSelection();
scene->setSceneRect(scene->itemsBoundingRect());
QImage image(scene->sceneRect().size().toSize(), QImage::Format_ARGB32); // Create the image with the exact size of the shrunk scene
image.fill(Qt::transparent); // Start all pixels transparent

QPainter painter(&image);
scene->render(&painter);
image.save(DATA_STORE_LOCATION"SNAP_"+ QString::number(count) + ".png");
count++;							 	      //Stops working after this Line

}

//Start Record
void MainWindow::StartRecord()
{
static int iVideoCount = 0;
mediaRecorder->setOutputLocation(QUrl::fromLocalFile(DATA_STORE_LOCATION"CLIP_"+ QString::number(iVideoCount)));
mediaRecorder->record();
iVideoCount++;
}

Looking forward to hearing from you.

Thank You,
Nikita Panchal

SGaist

Hi,

Where exactly do you write these files on your iMX6 device ?

nikita.panchal09

Thanks for your response.

Yes, I am running an application on the imx6 platform using the root user.
Location of application is : /home/user/CameraApp
Location of capturing files is : /root/Pictures

[FYI]
I printed the error and I found that on clicking "capture Image (on_captureImage_clicked())", It gives "CameraBin error: Internal data stream error."

Thanks,
Nikita

SGaist

Can you run your capture successfully using GStreamer on your board ?

nikita.panchal09

Hi,

First of all thanks for looking in the issue.

Yes, I can run capture successfully using below GStreamer command:
gst-launch-1.0 imxv4l2videosrc num-buffers=1 ! jpegenc ! filesink location=test.jpg

While looking in issue, I found that capture and record are working fine with QVideoWidget and QCameraViewfinder but hangs with QGraphicsView.

Thanks,
Nikita

SGaist

Out of curiosity, any particular reason to use QGraphicsView ?