I can suggest to get a good quality software, Freemake is nice but I have see issues in the long run, I use WinX HD Video Converter Deluxe and adding external Subtitles is something I do a lot, due to my handicapped daughter that is hard of hearing, so I convert DVD to NAS MP4 all the time. and it is a solid program, to use. not free, but well worth the cost. https
/www.winxdvd.com/hd-video-converter-deluxe/ is the web site and just noticed they are running a 35.95$ instead of 49.95$ sale right now....
again among 7 or 8 titles I have run through it was the best one I have used.