QT6 Using QVideoSink with QCamera to process every frame - camera

Question

I`m digging example qt6 6.2.2 camera.pro and found next line code:
m_captureSession.setVideoOutput(ui->viewfinder);
this is the way of outing frames to ui.
I know what QVideoSinc is used for grab every frame and process it.
I have replaced this line with m_captureSession.setVideoSink(&videoSink);
where videoSinc defined as my class :
class MyVideoSinc : public QVideoSink
{
Q_OBJECT
public:
bool videoframeReady=false;
MyVideoSinc()
{
connect(this, &QVideoSink::videoFrameChanged, this, &MyVideoSinc::hvideoFrameChanged);
}
public Q_SLOTS:
void hvideoFrameChanged(const QVideoFrame &frame)
{
videoframeReady=true;
}
};
hvideoFrameChanged raised for every frame in Windows build, but only once in Android application.
What is wrong here. How to grab and process frames from QCamera in QT6 ? I don`t want show frames with ui->viewfinder.
I need processing frames myself.

Answer 1

I made a small repository to show how to process frames with QVideoSink in Qt6. Have a look at it.
I use such approach in my own applications, I tested it on Android 9, all works like a charm.
But be careful, on Linux from launch to launch FPS can differ very much, sometimes FPS are normal, but very often FPS are very-very low - 1 FPS only. This is a bug Qt6, 6.2.3 affected still. Have a look at the bug.