questionsany good open source dvd / blu-ray rippers for pc?

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DVD Fab HD Decrypter works really well and doesn't compress unless you ask it to. However, it's only a 30 day trial and then it costs $200 -- unless you have a friend with an old CD Key they don't use anymore ;)

It is really useful though (except when it rips the files and they disappear for no apparent reason

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I personally use MakeMKV. Compression is minimum from what I can see, although that means file sizes tend to be a bit big, around 7GB for DVD and 20GB for Blu-ray. Usually doesn't take longer than 30 minutes to rip a movie.
The program is free during beta, but you can purchase it for $50.

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DVDfab has always done right by me.