www.makemkv.com

I'm setting up a new (to me) Mint 19.2 machine on an old Mac Pro 5,1. I followed the instructions here for downloading and building ffmpeg, makemkv-oss, and makemkv-bin. https://forum.makemkv.com/forum/viewtopic.php?f=3&t=224 However, makemkv is apparently not using ffmpeg, it isn't decrypting D...