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I'm new to MakeMKV I have been trying to rip the movie "Interstellar" for my son, the video rips fine but the audio doesn't work, I looked in the tree and made sure the audio file I needed was selected, I can't figure out what is wrong has anyone else had this problem and how do I fix it??

blu-ray.com suggests that Interstellar has DTS audio. Not all players support DTS audio by default, most notably Windows Media Player. VLC supports most formats by default though. Give VLC a try and see if the audio works then.

A handy utility called MediaInfo can show you lots of details about the contents of .mkv files, including the number and format of the audio tracks in the file.

thanks, VLC says "AACS Host certificate revoked" will have to look into it a bit more

It might say that if you're trying to use MakeMKV to play your blu-ray. Try using VLC to play the .mkv file you created with MakeMKV.