Does anyone know a method to grab frames with reduced ROI at framerates above 1000fps? I am testing in Python and will be processing the images using OpenCV.

I am using the following line of code but I am seeing a lot of fluctuation in the frame rates, only reaching the reported max frame rate about 50% of the time.

cap0 = cv2.VideoCapture(f"v4l2src io-mode=dmabuf device=/dev/video0 ! video/x-raw, format=(string)GRAY8, width=(int){704}, height=(int){544} ! appsink")