Downloads
Plex Plug-Ins
This plug-in is on hold due to compatibility issues between Plex and MakeMKV. You can download and try to install it. But most likely it will not work.
If you would like to try to get it to work you can play with the python source after its installed. located at: ~/Library/Application Support/Plex Media Server/Plug-ins/MakeMKV.bundle/Contents/Code