A RTSP Unity Plugin for Textures and Cameras
Downloaded the ffmpeg-4.2.2-win64-dev from https://ffmpeg.zeranoe.com/builds/ and add those as dependencies or copy them (include & lib) to the project folder.
Inside RTSPUnityPluginSingleton.cpp add #pragma warning(disable : 4996),
Then build.
The default settings will place the resulting dll in ../../build/
Worked for me with VS2015 & Windows 10 SDK