The other day I ordered the DVD of the film Arrival, to watch it again before voting on the Hugos. Unfortunately, both my original copy and a replacement I got failed to be watchable — the DVD is badly authored and gives “Invalid IFO” errors in libdvdnav.
As no other DVDs are affected, I think this is a bug with the DVD authoring rather than with libdvdnav or libdvdcss2, but it’s one that I thought worth pointing out in case anyone else had the same problem.
(This is on Debian Stretch, with libdvdcss2 version 1.2.13-0 — I also tried with version 1.2.10-1, and it failed the same way).