I use mplayer for DVD playback, I believe it requires manually installing a few of the DVD libraries for navigation and content descrambling (..libdvdcss).
For accessing devices directly, you should always avoid the block devices, use /dev/rcd0c instead and set a cache value for your player.. most have it.
There is typically no need to mount a DVD, generally the players and associated libraries work better accessing the drive themselves.
For DVD ripping dvdbackup port seems to work well, and can be useful for confirming the proper libraries have been installed for accessing the drive.
I do believe that read and write access is required for negotiating encryption with the drive, but, I haven't confirmed this.
Good luck,
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