I was trying to rip a title from a personally owned DVD when I noticed the Clip & Zoom tab didn’t have any previews and later on I found it wouldn’t transcode either. I later found it was stuck at 0% trying to ript the title.
Running dvd::rip from command line revealed the following error message:
************************************************
** **
** No css library available. See **
** /usr/share/doc/libdvdread4/README.css **
** for more information. **
** **
************************************************
It was obvious that it was missing the decryption part of the DVD playback library. To solve it just install the libdvdcss library which can be found here.
Another easy to fix once you know what the problem is.