Rip it with MakeMKV. Add music in iMovie. Burn using iDVD.
Use Handbrake:
https://handbrake.fr/downloads.php
Ah, didnt know that. I never use iMovie. Just remux it to MP4 then, using Subler, to avoid quality loss.iMovie can not open the file . mKV
Yes.change to .mp4 high profile? then import it to iMovie and add the audio and burn to DVD-R ?