I use this ad2ac3dec.dll from encore copy and paste to premiere and then change the *.vob of the files I want to use into *.avi. It works for me. Also Xilisoft video convertor look like it works but is faster this way
When I googled DVD rippers that rip movies is Dolby 5.1, PavTube DVD ripper was one of the ones that came up. I tested other only to find the product didn’t work or the tech support wasn’t there. Easy to use and very handy. Quality is good. Speed seems a bit lack for DVD to convert to AVI/MKV but since it has the auto turn off function then I don’t have to sit and wait so no complain here. In general, it’s a great software.
You can try E.M. HD Video Converter.
1: convert your favorite videos to various HD (high definition) video formats like HD WMV Video, HD DivX Video, HD Xvid Video, HD H.264 Video, HD Quick Time Video, HD MPEG4 Video, HD FLV Video, HD TS Video, etc.
2: create Blu-ray folder for PS3 and Blu-ray player. besides, E.M. HD Video Converter can easily burn all videos and AVCHD (mts, m2ts) to DVD, DivX DVD.
Hope this is helpful.