Compiled version of OpenCV is unable to read video metadata (frame count)

Asked Nov 06 '17 at 19:31

Active Nov 06 '17 at 22:49

Viewed 87 times

I have compiled OpenCV according to https://docs.opencv.org/master/d7/d9f/tutorial_linux_install.html

Used sources for 2.4.13.4.

Used the following cmake command:

cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D PYTHON3_EXECUTABLE=/opt/anaconda3/bin/python PYTHON_INCLUDE_DIR=/opt/anaconda3/include/python3.5m PYTHON_INCLUDE_DIR2=/usr/include/python3.5 PYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.5m.so 
PYTHON3_NUMPY_INCLUDE_DIRS=/opt/anaconda3/lib/python3.5/site-packages/numpy/core/include ..

Tests ran ok.

sudo make install ran ok.

Unfortunately, in Python:

    video = cv.VideoCapture(filename)
    frame_count = int(video.get(cv.CAP_PROP_FRAME_COUNT))

returns zero.

Suspect that cv2 package I use in python is just something separate.

How to ensure cv2 uses the same OpenCV i compiled?

UPDATE

dims@calculon:~$ python -c "import cv2; print(cv2.__version__)"
3.3.0
dims@calculon:~$ pkg-config opencv --modversion
2.4.13.4

edited Nov 06 '17 at 22:49

asked Nov 06 '17 at 19:31

Dims

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In terminal: `python -c "import cv2; print(cv2.__version__)"` and `pkg-config opencv --modversion`, check if the outputs are the same. If the `VideoCapture` class is not able to open video files then read the following: https://stackoverflow.com/questions/47112642/permanent-fix-for-opencv-videocapture/47116576#47116576 – zindarod Nov 06 '17 at 21:57
results were not the same, see my update please – Dims Nov 06 '17 at 22:49
So your python install is running a different (newer) version than you are building. – Martin Beckett Nov 06 '17 at 22:52
@MartinBeckett okay, and how to force it to use one I am building? – Dims Nov 06 '17 at 23:12
Remove the other one from your packages (pip or conda) – Martin Beckett Nov 06 '17 at 23:26
@MartinBeckett how? – Dims Nov 07 '17 at 09:27

Compiled version of OpenCV is unable to read video metadata (frame count)

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