Can not install PyAV on Win10

[FreemanZ]

 We didn't find `avformat_open_input` in the libraries.
    We look for it only as a sanity check to make sure the build
    process is working as expected. It is not, so we must abort.

    Please open a ticket at https://github.com/mikeboers/PyAV/issues
    with the folowing information:

    PyAV: 0.4.0 (unknown commit)
    Python: b'3.5.4 (v3.5.4:3f56838, Aug  8 2017, 02:17:05) [MSC v.1900 64 bit (AMD64)]'
    platform: Windows-10-10.0.16299-SP0
    extension_extra:
        library_dirs: [b'c:\\python35\\libs', b'c:\\python35\\PCbuild\\amd64']
        include_dirs: [b'include', b'c:\\python35\\include', b'c:\\python35\\include']
        extra_link_args: [b'/OPT:NOREF']
        libraries: [b'avformat', b'avcodec', b'avdevice', b'avutil', b'avfilter', b'swscale', b'swresample']
    config_macros:
        PYAV_COMMIT_STR="unknown-commit"
        PYAV_HAVE_AVCODEC_SEND_PACKET=0
        PYAV_HAVE_AVFORMAT_ALLOC_OUTPUT_CONTEXT2=0
        PYAV_HAVE_AVFORMAT_CLOSE_INPUT=0
        PYAV_HAVE_AVFRAME__MB_TYPE=0
        PYAV_HAVE_AV_CALLOC=0
        PYAV_HAVE_AV_FRAME_GET_BEST_EFFORT_TIMESTAMP=0
        PYAV_HAVE_AV_OPT_TYPE_BOOL=0
        PYAV_HAVE_LIBAVRESAMPLE=0
        PYAV_HAVE_LIBSWRESAMPLE=1
        PYAV_VERSION=0.4.0
        PYAV_VERSION_STR="0.4.0"
        inline=__inline

    ----------------------------------------
Command "c:\python35\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\axros\\AppData\\Local\\Temp\\pip-install-u8t4vvk5\\av\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record C:\Users\axros\AppData\Local\Temp\pip-record-sp93945n\install-record.txt --single-version-externally-managed --compile" failed with error code 1 in C:\Users\axros\AppData\Local\Temp\pip-install-u8t4vvk5\av\

[FreemanZ]

ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7.3.0 (GCC)
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100

[mikeboers]

If this were Linux, I'd say that it was very likely that PyAV was trying to link against the static libraries instead of dynamic.

I'm not familiar with Windows build problems. You closed the issue, which I hope means you solved it. What was it?

[joshferns]

@FreemanZ how did you eventually solve this?
I'm stuck at the same error.

[kesaroid]

libraries: [b'avformat', b'avcodec', b'avdevice', b'avutil', b'avfilter', b'swscale', b'swresample']

I am getting LINK : fatal error LNK1181: cannot open input file 'swscale.lib' of most of these. How did @FreemanZ solve this?

[tschoepflin]

I was able to get past this by downloading the correct version of FFMPEG ("dev"), which has folders "include" and "lib". These are necessary to do the build.

I got this error when I was pointing to a folder containing the static executable and looking back, of course that won't work.

[Res260]

With @tschoepflin 's comment, I was able to install av with pip install av. It can be downloaded here: https://ffmpeg.zeranoe.com/builds/

I needed to put the content of the include directory in <PYTHON_DIRECTORY>/include and the content of the lib directory in <PYTHON_DIRECTORY>/libs (don't forget the s). The build was then successful.

[quentin-dietz]

The zeranoe website appears to be offline, however archive.org has a copy which allows you to download the builds:

https://web.archive.org/web/20200918191847/https://ffmpeg.zeranoe.com/builds/