Unsolved QAbstractVideoSurface camera frames brightness
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Hi everyone,
I implemented a QAbstractVideoSurface, and a widget to be painted based on this example.
Everything works fine, but the camera preview I get is very dark compared to the result I get when I use a QCameraViewfinder or QVideoWidget.
Here's the code I am using to create the QCamera:m_camera = new QCamera(this); connect(m_camera, &QCamera::statusChanged, this, &MainWindow::cameraStatusChanged); m_camera->load(); m_camera->setViewfinder(ui->videoWidget->videoSurface()); // videoSurface is a QAbstractVideoSurface
And here's the slot 'cameraStatusChanged':
void MainWindow::cameraStatusChanged(QCamera::Status status) { if(status == QCamera::LoadedStatus) { m_cameraLoaded = true; QCameraImageProcessing *imgProcessing = m_camera->imageProcessing(); if(imgProcessing->isAvailable()) { qDebug() << "image processing available"; imgProcessing->setBrightness(1.0); imgProcessing->setSaturation(1.0); } } else if(status == QCamera::UnloadedStatus) { m_cameraLoaded = false; } }
Unfortunately, the brightness and the other filters (like the saturation) don't work and the preview video is still dark.
How can I change the brightness of my video frames?
Do I need to implement my own QVideoWidget and a QPainterVideoSurface (which is undocumented) ?
Thank you in advance.EDIT: Is there a way to adjust the brightness automatically, as the QVideoWidget does?
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For those who implemented a QAbstractVideoSurface: didn't anyone have that problem?