New plex server and video encoding software assistance needed

Hello everyone this is my first post here I'm looking for some assistance I have decided to go ahead and convert my gaming rig to serve as a Plex server for my home I have a son who has a lot of children's movies and I would like some assistance with getting the proper software set up on my machine currently the Plex software setup has been very easy and everything on that end is working the way it should the issues I'm having now are converting my physical DVD media to digital copies. I have downloaded handbrake and vlc but handbrake doesnt like drm and vlc while i have followed some video tutorials and had success in copying the media the actual playback is a stuttering mess and the audio is out of sync. Any assistance or advice would be greatly appreciated.

I use MakeMKV.

I will give it a try thanks

Got makemkv installed and its working great my son is already streaming one of his favorite movies from plex we appreciate the help.