DVD backup (Linux utility) for ripping the dvd into original VOB files and ffmpeg with appropriate switches (input: -i "concat:VTS_01_0.IFO:VTS_01_0.BUP:VTS_01_1.VOB:(etc)") for making it into an .mkv file with either the original codec (-c copy) or hevc (also -map 0 for all audio/video/subtitle tracks to be saved)

VERY.