I was having this problem too. I had installed CSS , I could see and browse the DVD, but it wouldn't play.
I could play unencrypted VOBs, but not encrypted ones. If I did a "Show properties" of an encrypted VOB, Nautilus would crash. I eventaully traced the problem: no region set on the DVD drive. I was getting the following messages on dmesg: [ 167.329314] sr 2:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 02 a2 00 00 02 00 [ 167.329332] end_request: I/O error, dev sr0, sector 2696 [ 167.335004] sr 2:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE [ 167.335015] sr 2:0:0:0: [sr0] Sense Key : Illegal Request [current] [ 167.335024] sr 2:0:0:0: [sr0] Add. Sense: Media region code is mismatched to logical unit region [ 167.335035] sr 2:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 02 a2 00 00 02 00 [ 167.335053] end_request: I/O error, dev sr0, sector 2696 Solution: install and use regionset. Still, this should be fixed centrally: Nautilus shouldn't crash, the message from mplayer should include the warning that a region code may not be set. ** Changed in: gstreamer0.10 (Ubuntu) Status: Expired => Confirmed -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gstreamer0.10 in Ubuntu. https://bugs.launchpad.net/bugs/782411 Title: Could not read DVD. This may be because the DVD is encrypted and a DVD decryption library is not installed. Status in “gstreamer0.10” package in Ubuntu: Confirmed Bug description: Crash video Could not read DVD. This may be because the DVD is encrypted and a DVD decryption library is not installed. ProblemType: Bug DistroRelease: Ubuntu 11.04 Package: libgstreamer0.10-0 0.10.32-3ubuntu3 ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2 Uname: Linux 2.6.38-8-generic i686 NonfreeKernelModules: nvidia Architecture: i386 CheckboxSubmission: 38bc6b46f2d3eb48b67747db1f140e5d CheckboxSystem: 384ad644e12c593c2335b8a19c1df0ec Date: Fri May 13 18:31:38 2011 ExecutablePath: /usr/bin/totem ProcEnviron: LANGUAGE=pt_BR:en LANG=pt_BR.UTF-8 SHELL=/bin/bash SourcePackage: gstreamer0.10 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gstreamer0.10/+bug/782411/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp