Compiling openCV

[asknask]

I was following the directions given in another thread here (#126 (comment)).

• I installed Git.
• I cloned this repo
• I cloned the OpenCV repo
• I copied the files from the OpenCV repo into the opencv folder of this repo
• I set a temporary environment variable as mentioned (set CMAKE_ARGS "-DOPENCV_ENABLE_NONFREE=ON")
• I then executed the python code from this repository as mentioned

I'm getting the following error now:

python setup.py bdist_wheel
fatal: not a git repository (or any of the parent directories): .git
Traceback (most recent call last):
  File "setup.py", line 397, in <module>
    main()
  File "setup.py", line 64, in main
    package_version = get_opencv_version()
  File "setup.py", line 351, in get_opencv_version
    runpy.run_path("find_version.py")
  File "C:\Program Files\Python38\lib\runpy.py", line 263, in run_path
    return _run_module_code(code, init_globals, run_name,
  File "C:\Program Files\Python38\lib\runpy.py", line 96, in _run_module_code
    _run_code(code, mod_globals, init_globals,
  File "C:\Program Files\Python38\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "find_version.py", line 26, in <module>
    git_hash = subprocess.check_output(['git', 'rev-parse', '--short', 'HEAD']).splitlines()[0].decode()
  File "C:\Program Files\Python38\lib\subprocess.py", line 411, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "C:\Program Files\Python38\lib\subprocess.py", line 512, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['git', 'rev-parse', '--short', 'HEAD']' returned non-zero exit status 128.

[skvark]

Well, the fatal: not a git repository (or any of the parent directories): .git kinda tells you the issue: it seems that you didn't clone the repo correctly. Hard to say without exact commands. And you don't need to copy the OpenCV repository, it's included as a submodule in this repository so you'll have to just call git clone --recursive to clone the files in to the opencv and opencv_contrib folders.

[asknask]

Well, the fatal: not a git repository (or any of the parent directories): .git kinda tells you the issue: it seems that you didn't clone the repo correctly. Hard to say without exact commands. And you don't need to copy the OpenCV repository, it's included as a submodule in this repository so you'll have to just call git clone --recursive to clone the files in to the opencv and opencv_contrib folders.

Thank you for the swift reply.

My mistake yeah. Once I posted the issue, and it was formatted properly, I saw that error (it was hard to spot in cmd).

I cloned the repo correctly and ran it again. Got a cmake error so I installed cmake. Now I'm getting an MSBuild error. I'm assuming I need Visual Studio installed to get this done?

It'd be nice to have all these prerequisites mentioned somewhere.

[asknask]

After a few hours of trial and error, finally managed to compile it.

Here's a little to-do list for anyone who faces this issue:

• Install cmake
• Install Visual Studio 2019 with the Python environment selected. Make sure to check the optional Python compile tools
• Open the setup.py file with a text editor (Sublime in my case) and edit line 100 to this:
  "-G", "Visual Studio 16 2019"
• Open cmd as administrator and type the following:
  set CMAKE_ARGS "-DOPENCV_ENABLE_NONFREE=ON"

And now finally, run the python setup.py bdist_wheel command.

Good luck.

[asknask]

Well, the fatal: not a git repository (or any of the parent directories): .git kinda tells you the issue: it seems that you didn't clone the repo correctly. Hard to say without exact commands. And you don't need to copy the OpenCV repository, it's included as a submodule in this repository so you'll have to just call git clone --recursive to clone the files in to the opencv and opencv_contrib folders.

What steps to I need to take after the compile process is complete, to make sure the opencv python stuff is accessible?

[skvark]

Yes, you need Visual Studio / compilation tools (Cmake can be installed for example with pip install cmake) to build OpenCV.

The wheel package is generated to the dist folder. You can install it with pip: pip install wheel_package_name.whl.

[asknask]

Done. Thank you.

[ghost]

λ python setup.py bdist_wheel
Version: 4.2.0+d608d69
setup.py:85: DeprecationWarning: SO is deprecated, use EXT_SUFFIX
['python/cv2[^/]*%(ext)s' % {'ext': re.escape(sysconfig.get_config_var('SO'))}],

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-- Trying "Visual Studio 16 2019" generator

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Not searching for unused variables given on the command line.
CMake Error at CMakeLists.txt:2 (PROJECT):
Generator

Visual Studio 16 2019

could not find any instance of Visual Studio.

-- Configuring incomplete, errors occurred!
See also "C:/Users/Firoz/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".

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-- Trying "Visual Studio 16 2019" generator - failure

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scikit-build could not get a working generator for your system. Aborting build.

Building windows wheels for Python 3.8 requires Microsoft Visual Studio 2017.
Get it with "Visual Studio 2017":

can any one please help because. i can not run the same. showing the above error message