Build on Windows about conda-opencv3

[patricksnape]

Yes you can use this on Windows - if you successfully ran the commands I listed, you will get a .tar.gz file (conda prints the path to it when it tells you that you can upload it to binstar) containing the OpenCV3 Python conda package which can be installed as you gave.

You cannot use the git repository because this set of recipes is full of patches that make the code actually compile - these rely on the specific 3.0.0 release of OpenCV3 and OpenCV-contrib.

[cpieringer]

I noted that conda requires a package called patch and give me an error message:

Applying patch: C:/ ... _mjpeg_decoder.patch
Did not find 'patch' in C:\Anaconda3....

I tried to install it directly using anaconda 3 but this package depends on python 2.7. Then I installed a version for python 3.4 using pip. But conda cannot use it.

Do you have experience with this issue?

Thank you in advance,
CHristian

[patricksnape]

If you have correctly placed the conda binary directory on your path then conda ships with the patch utility. Regardless, you could use something like cmder as your shell, which will also give you patch. Run conda build from inside a cmder shell and enjoy the Unix-like experience :)

I tried to install it directly using anaconda 3 but this package depends on python 2.7. Then I installed a version for python 3.4 using pip. But conda cannot use it.

I don't know what you meant by this? What package depends on Python 2.7? This repo makes builds for all Python versions. Try:

set CONDA_PY=34
conda build conda

To build the Python 3.4 version inside a Python 2.7 Miniconda environment.

[cpieringer]

@patricksnape I tried your advice, however patch does not exist in my conda installation. The cmder shell works but it also gives me an error about missing patch.

[patricksnape]

Hmm. I'm confused why this works for me and not you! It definitely ships with conda otherwise the conda meta.yaml couldn't contain the patch section. Try grabbing the patch command from here and putting it on your path (maybe in the conda bin folder?) If it still fails as missing patch then you aren't placing it on your path correctly!

[patricksnape]

Also - as a note: this is exactly why I provide this repository - because building this software is a nightmare. I cannot stress more that you shouldn't bother trying to build it unless you absolutely have to. Why don't you just use conda?

[cpieringer]

@patricksnape I will try download and put patch in the bin folder. I want to build the library beacuse I am using Python 3. Conda only install opencv for python 2.7. But if there are not other solution, I will use Python 2.7 with the conda installation. Thank you very much!

Best regards.

[patricksnape]

You don't need to, conda will install OpenCV3 for Python 3, just install it from my repository! Seriously, run these commands:

conda create -n opencv3 python=3
activate opencv3
conda install -c menpo opencv3

That should install OpenCV3 in a Python 3 environment!