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‎README_CONTRIB.rst

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@@ -48,23 +48,29 @@ Frequently Asked Questions
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Q: Do I need to install also OpenCV separately?
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A: No, the packages are special wheel binary packages and they already contain statically built OpenCV binaries.
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Q: Pip does not find package opencv-contrib-python?
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A: The wheel package format and manylinux builds are pretty new things. Most likely the issue is related to too old pip and can be fixed by running ``pip install --upgrade pip``.
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Q: Import fails on Windows to some DLL load error?
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A: If the import fails on Windows, make sure you have `Visual C++ redistributable 2015 <https://www.microsoft.com/en-us/download/details.aspx?id=48145>`__ installed. If you are using older Windows version than Windows 10 and latest system updates are not installed, `Universal C Runtime <https://support.microsoft.com/en-us/help/2999226/update-for-universal-c-runtime-in-windows>`__ might be also required.
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Q: I have some other import errors?
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A: Make sure you have removed old manual installations of OpenCV Python bindings (cv2.so or cv2.pyd in site-packages).
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Q: Why I can't open video files on GNU/Linux distribution X or on macOS?
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A: OpenCV video I/O depends heavily on FFmpeg. Manylinux and macOS OpenCV binaries are not compiled against it.
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The purpose of these packages is to provide as easy as possible installation experience for OpenCV Python bindings and they should work directly out-of-the-box.
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Adding FFmpeg as an additional dependency without a "universal" FFmpeg build (e.g. LGPL licensed static build like in the Windows wheels) the goal is considerably harder to achieve. This might change in the future.
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Q: Why I can't open GUI windows (``cv2.imshow()``) on GNU/Linux distribution X or on macOS?
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A: Like above, OpenCV was not compiled against GTK or Carbon. Support for these might be added in the future.
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Documentation for opencv-python

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