I use python and opencv and these command, it always says that.
Because I just wanna to test that.
How to solve that? Thank you.
cap = cv2.VideoCapture(0)
cap = cv2.VideoCapture(-1)
[ WARN:0] global /tmp/pip-req-build-h8zflkjv/opencv/modules/videoio/src/cap_v4l.cpp (890) open VIDEOIO(V4L2:/dev/video0): can’t open camera by index