Getting duplicate frame

I using following model of basler camera: acA1920-40uc I have connect my camera to controller which moves in a particular direction and capture images. If i move camera from A to B to C. It happens that i get similar image for all the location. I have tried camera->StartGrabbing(GrabStrategy_LatestImageOnly); but i still get duplicate frame. I have used similar logic in python and issue does not occur. I can use grabOne and software trigger but it creates an extra delay to fetch the frame which is not desirable in my case. Sharing the cpp and python code. Please let me know in case of any issues.

Cpp: Initialization:

void PrimaryCamera::initializeCamera()
{
    try
    {
        camera = new Pylon::CInstantCamera(CTlFactory::GetInstance().CreateFirstDevice());
        cout<<"Using Device"<<camera->GetDeviceInfo().GetModelName()<<endl;
        camera->MaxNumBuffer = 1;
        formatConverter.OutputPixelFormat = PixelType_BGR8packed;
        camera->Open();
        camera->StartGrabbing(GrabStrategy_LatestImageOnly);
        cout<<"\nCamera Initialized Successfully"<<endl;
    }catch(GenICam::GenericException &e) {
        cerr << "An exception occurred." << endl  << e.GetDescription() << endl;

    }

}

Capture Frame:

cv::Mat PrimaryCamera::captureBaslerFrame()
{
    if(camera->IsGrabbing()){
        camera->RetrieveResult(500, ptrGrabResult, TimeoutHandling_ThrowException);
        if (ptrGrabResult->GrabSucceeded()){
            formatConverter.Convert(pylonImage,ptrGrabResult);
            return cv::Mat(ptrGrabResult->GetHeight(),ptrGrabResult->GetWidth(), CV_8UC3,(uint8_t *)pylonImage.GetBuffer());

        }
    }else{
        cout<<"Currently camera is not grabbing frames"<<endl;
    }
}

Python:

try:
    camera = pylon.InstantCamera(pylon.TlFactory.GetInstance().CreateFirstDevice())
    print("Using device ", camera.GetDeviceInfo().GetModelName())
except:
    print("Oops!", sys.exc_info()[0], "occured.")
    sys.exit('no camera port found')

# Grabing Continusely (video) with minimal delay
camera.StartGrabbing(pylon.GrabStrategy_LatestImageOnly)
converter = pylon.ImageFormatConverter()
# # converting to opencv bgr format
converter.OutputPixelFormat = pylon.PixelType_BGR8packed
converter.OutputBitAlignment = pylon.OutputBitAlignment_MsbAligned


def grab_img():
    grabResult = camera.RetrieveResult(1000, pylon.TimeoutHandling_ThrowException)
    if grabResult.GrabSucceeded():
        image = converter.Convert(grabResult,)
        img = image.GetArray()
        grabResult.Release()
    return img

[HackersSpirit]

@thiesmoeller : Thanks for the help. Finally i was able to find out the issue. Actually earlier i was running a git example inorder to fetch the frame. When i went through the document i found out the problem was in initialization: camera->MaxNumBuffer = 1; The max size of the buffer the more samples can be stored. This also answers the question why i was getting no repeated frame after continuously fetching the frame.

[thiesmoeller]

If you don’t won’t to synchronize with external hw trigger, but know the exakt timing of your movement use https://docs.baslerweb.com/#t=en%2Facquisition_frame_rate.htm to configure a larger spacing between your frames