Support for 20 frames per second

[MenahemOwlytics]

I use AXIS Q3538-LVE Dome Camera
To capture and process images, I use docker-acap:
Using this code, I try to capture images at 4K resolution and 20 frames per second:

VideoCapture cap(1);
cap.set(CAP_PROP_FPS, 20);
cap.set(CAP_PROP_FRAME_WIDTH, IMG_WIDTH);
cap.set(CAP_PROP_FRAME_HEIGHT, IMG_HEIGHT);
cap.set(CAP_PROP_FOURCC, VideoWriter::fourcc('R', 'G', 'B', '3'));
constexpr size_t BUFFERS = 2;

while(true) {
       int index;
       milliseconds startInferenceTime = getCurrentTime();
       cap.read(originalMat);
       milliseconds endInferenceTime = getCurrentTime();
       std::cout << "cap image time: " << endInferenceTime.count() - startInferenceTime.count() << std::endl;
       originalMat.release();
}

I'm getting a cap.read() image time of 80ms, so it can only support 12 fps. Can I support 20 fps in this implementation?

Thanks so much
Menahem

[Corallo]

Hi @MenahemOwlytics

You could try to disable the WDR from the camera settings, that should reduce the capture latency.