FFmpeg 4.4.4 inside OpenCV's video I/O plugin -- Enchant Dashboard for Windows

Published at: https://aienchant.com/oss/ffmpeg/4.4.4/

Enchant Dashboard for Windows ships opencv_videoio_ffmpeg4100_64.dll in its engine\ folder. That
file is OpenCV's FFmpeg plugin exactly as the OpenCV project distributes it for OpenCV 4.10.0; we
do not rebuild or modify it. It contains FFmpeg 4.4.4, licensed under the GNU Lesser General Public
License version 2.1 or later (COPYING.LGPLv2.1), statically linked into that one DLL, which OpenCV
loads at run time. This folder is the complete corresponding source.

  ffmpeg-4.4.4.tar.xz (+ .asc)
      The FFmpeg 4.4.4 release, sha256 e80b380d595c809060f66f96a5d849511ef4a76a26b76eacf5778b94c3570309,
      signed by the FFmpeg release key FCF986EA15E6E293A5644F10B4322F04D67658D8. OpenCV builds the
      git tag n4.4.4 of FFmpeg, which this release corresponds to, and applies no patches to FFmpeg.

  opencv-videoio-ffmpeg-4.10.0/build-scripts/
      OpenCV's build scripts for this plugin, from https://github.com/opencv/opencv_3rdparty commit
      394dca6ceb3085c979415e6385996b6570e94153
      (the commit OpenCV 4.10.0 pins in 3rdparty/ffmpeg/ffmpeg.cmake). ffmpeg/make_mingw.sh holds the
      configure line, ffmpeg/download_src.sh the exact versions of the other libraries built in:
        libvpx v1.14.0   BSD-3-Clause                            https://chromium.googlesource.com/webm/libvpx
        libaom v3.9.0    BSD-2-Clause + AOMedia Patent License   https://aomedia.googlesource.com/aom
        OpenH264 v1.8.0  BSD-2-Clause, API headers only          https://github.com/cisco/openh264
      The plugin contains only a small loader (ffmpeg/openh264_wrapper/) that uses Cisco's OpenH264
      DLL if one is installed separately. No OpenH264 code is compiled in, and Enchant does not ship
      that DLL.

  opencv-videoio-ffmpeg-4.10.0/BINARY.sha256
      The file we ship: sha256 3de83b84588b3ee8bacdbea85a8f92d4855a32a1108183963315a7db06ad5744.
      Its MD5 bfef029900f788480a363d6dc05c4f0e equals FFMPEG_FILE_HASH_BIN64 in OpenCV 4.10.0's ffmpeg.cmake.

Use your own build (or a modified FFmpeg) with Enchant Dashboard:
  1. close Enchant Dashboard
  2. replace engine\opencv_videoio_ffmpeg4100_64.dll in the installation folder (default
     %LOCALAPPDATA%\Programs\Enchant Dashboard) with your own build of OpenCV's FFmpeg plugin,
     same file name (opencv-videoio-ffmpeg-4.10.0/build-scripts shows how OpenCV builds it)
  3. start Enchant Dashboard. It does not check that file's contents. An Enchant update puts the
     shipped file back -- copy yours again afterwards.

The FFmpeg 8.1.1 libraries Enchant ships next to it are published at ../8.1.1/.