DVDx is an open source audio/video encoder as well as a powerful DVD copier. DVDx is very easy to use: open a DVD or file in the player, play it with audio/subtitle of your choice ; encode a short preview and play it to ensure it's what you expect, and then start the whole encoding job which can take about one hour but you're quite sure to get a very good result! DVDx is based on the most popular and powerful encoders: x264, MEncoder and FFmpeg.
Note: This software only a free trial, and if you like it, support the software developer and buy it.