Python OpenCV : VideoCapture differences between P

问题:

I'm connected to remote system through ssh, and trying to read frames using OpenCV VideoCapture in Python. The same code succeeds when using Python 2.7 and fails when using Python 3.5:

import cv2
cap = cv2.VideoCapture(0)

Python2.7:

print cap.isOpened() # prints True, further read() calls also return True

Python3.5:

print (cap.isOpened()) # prints False, and so are cap.open(), and of course cap.read().

What could cause such behavior?

Thanks!

回答1:

I had exactly the same problem. OpenCV was installed from the sources. The difference between Python 2 and 3 environment was, that for Python 3 opencv-python was additionally installed via pip3. A

pip3 uninstall opencv-python

solved it in my case.