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(python) VideoCapture() returns zero for all CV cap props

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Hello everybody, I am trying to create a plot as overlay in my video (uisng openCV and matplotlib). The first thing would be to detect the frames of the video. This is what I am trying to do: cap = cv2.VideoCapture('C:/PyDev/workspace/MyProject/src/files/video.mp4') pos_frame = cap.get(cv2.cv.CV_CAP_PROP_POS_FRAMES) Using the debugger, the variable *cap* hold the value VideoCapture: but the value of pos_frame is *0.0*. I already tried other videos and other formats. Also I installed the K-Lite Codec Pack. Unfortunately it didn't help. I don't really understand if the video is loaded successfully (I think yes, as cap is not empty). Also calling cap.grab() retuns *False*. Does anyone know how to solve this problem?

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