see below - I just figured that this problem also occurs with the camera example:
https://doc.qt.io/qt-5/qtmultimedia-multimediawidgets-camera-example.html On OSX it takes 35 seconds to process the first snapshot image - after that all is fine. To me it looks like a bug, which I will report asap. If you doubt this is the case please let know. Thanks and best Alex -- http://www.carot.de Email : alexan...@carot.de Tel.: +49 (0)177 5719797 > Gesendet: Dienstag, 02. Oktober 2018 um 09:11 Uhr > Von: "Alexander Carôt" <alexander_ca...@gmx.net> > An: "qt qt" <interest@qt-project.org>, olszak.tom...@gmail.com > Betreff: Re: [Interest] video init duration > > Hello Tomasz and all, > > sorry for the late response - needed to figure several things first. > > >>Have tried to wait until camera is in active status? > > Yes, this is the case. Not that I consciously did that but the cam de facto > is in active state. > > >>And why you set timer interval to 40 ms? > > Assuming a frame rate of 25 fps the capture interval is 40 ms. > > In the meantime I figured that this > > Please find a minimal example app here, which shows my problem decribed > below. It works fine on Linux, Windows and also Windows in a virtual Box on > OSX but on native OSX I have this delay of 35 seconds until the sytems works: > > https://www.dropbox.com/s/u6ifh6enco012xk/myCamera.zip?dl=0 > > Thanks, > best > > Alex > > -- > http://www.carot.de > Email : alexan...@carot.de > Tel.: +49 (0)177 5719797 > > > > Hi all, > > > > I have a video related app, which works fine but it takes 35 seconds after > > initialization for the cam to work in single-capture modus. The code looks > > like this: > > > > Camera::Camera() : ui(new Ui::Camera){ > > ui->setupUi(this); > > > > QCameraViewfinderSettings cameraSettings; > > cameraSettings.setMinimumFrameRate(25); > > > > camera = new QCamera( QCameraInfo::defaultCamera() ); > > imageCapture = new QCameraImageCapture(camera); > > > > this->connect(imageCapture, &QCameraImageCapture::imageCaptured, this, > > &Camera::imageCaptured); > > > > camera->setViewfinder(ui->viewfinder); > > > > captureTimer = new QTimer(this); > > captureTimer->setInterval(40); > > connect(captureTimer, SIGNAL(timeout()), this, SLOT(takePicture())); > > captureTimer->start(); > > > > camera->start(); > > } > > > > void Camera::imageCaptured(){ > > cout << "IMAGE PROCESSED" << endl; /// THIS IS TRIGGERED THE FIRST > > TIME AFTER 35 SECONDS > > } > > > > void Camera::takePicture(){ > > imageCapture->capture(); > > } > > > > This happens on OSX with the default inbuilt cam. I have not tested it on > > other OSes yet but is there way to speed this time up or is it even a bug I > > am having here ? > > > > Thanks in advance, > > best > > > > Alex > > > > > > > > -- > > http://www.carot.de > > Email : Alexander at Carot.de > > Tel.: +49 (0)177 5719797 > > _______________________________________________ > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest > _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
