you don't need to mount dvds for mplayer to play them
mplayer by default trys to open /dev/dvd as the dvd device to read (of course this device is non existent)
theres 2 solutions, create a sym link from /dev/dvd to your dvd drive, or go
mplayer dvd://1 -dvd-device /dev/hdc
assuming /dev/hdc is your dvd device
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