I'm trying to mount a DVD video that has no kind of copy protection on it. It plays just fine in Windows and in DVD players. If I insert a regular data DVD it automounts just fine and I can browse it. I've installed regionfree, followed the RestrictedFormatsPlayingDVDs wiki, and fiddled with this thing for hours to no avail.
-- EDIT --
This is the error I get trying to load the dvd stream in mplayer from the CLI
manyxcxi@Portland:~$ mplayer dvd://
MPlayer 1.0rc4-4.5.2 (C) 2000-2010 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing dvd://.
libdvdread: Using libdvdcss version 1.2.10 for DVD access
libdvdnav:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdnav:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
Can't open VMG info!
No stream found to handle url dvd://
Exiting... (End of file)
It appears to just be plain not seeing it as a valid disc.
mplayer has had problems with libdvdnav, which is what might be giving you problems.
http://lists.mplayerhq.hu/pipermail/mplayer-users/2009-January/075695.html
You might want to try and compile mplayer with out libdvdnav using
in the ./configure file of the source code.
Or simply try something other then mplayer. vlc, or totem. They are perfectly cable player. Then just select play from dvd options.
In totem Media > open > navigate to dvd on the right hand pane.
In vlc Media > open disc > play vlc has many more options to select the location of your device or dvd.
Have you installed libdvdcss like it says on that wiki page? you will need to do that in order for DVD playback to work.
It may still be a copy protection problem in that the dvd software used to create the dvd has encrypted the dvd with out region locking it. A non region locked dvd can still be encrypted.
libdvdcss, is not included in Ubuntu by default because of licensing issues, a simple google search will give you quite a bit of info.
To test if this is your problem start a player from the command line eg.
Then open the file or location of your dvd. You should then see the following appear on the command line if every thing is working correctly.