The error I've been getting has to do with the LibAV .
If this is in the regular settings window I don't have it.
I did uninstall v 26 & then I installed v 27 . It has the "Preview" or "Data rate" Tabs .
The Complete & partial disc rips are working now & were with v26 also.
It is the conversion to .mkv or .mp4 I get the error with .
The Preview many times freezes so the data rate Tab is what I will use.
It is beginning to work better so maybe a couple of more versions will fix the error.