I've tried a half a dozen programs to rip DVD's to a MKV file and some work and some don't. (Handbrake is rubbish!) However what none of them do is include the subtitles. I even downloaded the subtitle file separately and included it in the menu in Wonderfox but to no avail, they still won't work. So, a great DVD ripper to MKV, but one that will include the .srt file so that I can choose subtitles if I wish.