Notes for compiling OCVWarp

In case you wish to build your own OCVWarp binaries, the following may be of use.

1. OCVWarp works with OpenCV's 3.4 branch. Not with 2.4, not with 4.x branch.
2. On Ubuntu and similar distributions, the travis yml file has all the steps needed to install dependencies, OpenCV and build OCVWarp.
3. On Windows, the pre-built OpenCV libraries don't seem to have ffmpeg support. So, it is not recommended to directly follow the appveyor yml file. Instead, building a set of OpenCV dlls with ffmpeg support, and then building OCVWarp, would be the way to go. The vcxproj files may need small modifications based on your OpenCV paths. OCVWarp is known to NOT work out of the box with Visual Studio 19, but works OK with Visual Studio 15 community edition.
4. Building using MingGW on Windows has the advantage of not needing Visual Studio, and is documented here.