On 4K wincam scales image up

[lutel]

with a simple code as below, im getting zoomed in (twice) the image from screen - window size is half the screen, but image inside is zoomed 2x. Native resolution is 4K. What could be wrong?

from wincam import DXCamera
import cv2

with DXCamera(0, 0, 1000, 1000, fps=240) as camera:
while True:
frame, timestamp = camera.get_bgr_frame()
cv2.imshow("ss",frame)
if cv2.waitKey(1) & 0xFF == 27:
break