QCamera Android Crash



  • @ QCameraViewfinder * viewFinder;
    QCamera * camera;
    QAbstractVideoSurface * surface;

    QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
    foreach (const QCameraInfo &cameraInfo, cameras) {
        if(cameraInfo.deviceName()=="front")
        {
            camera = new QCamera(cameraInfo);
            qDebug() << "found cam";
        }
    }
    
        viewFinder = new QCameraViewfinder;
        camera->setViewfinder(viewFinder);
        //ui->webBox->layout()->addWidget(viewFinder);
        viewFinder->show();
        camera->start();@
    

    It does not matter if I use the QCameraViewfinder or QAbstractVideoSurface, once the camera is started, the application crashes. Any ideas are welcome :)

    (void MainWindow::openScanner()): found cam
    Fatal signal 11 (SIGSEGV) at 0x00000005 (code=1), thread 15692



  • just tested, it crashes @ camera->setViewfinder(viewFinder);


  • Lifetime Qt Champion

    Hi,

    So it's not when the camera starts, right ?

    Are you sure that camera is really valid at this time ?



  • It was a problem with the viewfinder/surface attached. Anyway now it crashes when the camera starts. I'm now trying to port the C++ version of the camera example to properly work on android, since I do not care about a live preview I'll try to re-render images as they come to the surface. If anyone already got a working example it would be much appreciated :)


  • Lifetime Qt Champion

    Just thought about something, IIRC you would need to use QML to have a preview on Android



  • using QML is not an option right now, this should be purely C++/Qt. Grabbing single images from the surface and displaying them in a Label should do the trick :)


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