setting exposure not working for Logitech cameras #262
Description
### Expected behaviour
since version 3.2.0.7, setting exposure was not possible anymore, I had to use other cameras and they worked! but not for Logitech C930 or C270 along with opencv-python, using different platforms macOS, Linux and windows
Write here how did you expect the library to function.
to set the exposure using the function, I've used before
cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_EXPOSURE, -11)
### Actual behaviour
now setting the exposure has no effect
even cap.get(cv2.CAP_PROP_EXPOSURE)
returns 0.0
Write here what went wrong.
### Steps to reproduce
use any of the mentioned cameras
for the code use a simple video acquisition
- example code
import cv2
cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_EXPOSURE, -11)
print(cap.get(cv2.CAP_PROP_EXPOSURE))
while True:
#cap.set(cv2.CAP_PROP_FPS, 30)
_, frame = cap.read()
#cv2.imshow('frame', frame)
cv2.imwrite('image.png', frame)
key = cv2.waitKey(1)
if key & 0xFF == ord('s'):
cv2.imwrite('image.png', frame)
if key & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
- operating system
macOS Catalina, linux ubuntu 18.04, windows 10
- architecture (e.g. x86)
64-bit
- opencv-python version
opencv-python -> 4.1.1(26)
macOS Catalina, python 3.7.5
linux ubuntu 18.04, python 3.6.8
windows 10, python 3.7.5