$ mplayer dvd://
MPlayer 1.0rc1-3.4.6 (C) 2000-2006 MPlayer Team
CPU: Intel(R) Pentium(R) M processor 1.60GHz (Family: 6, Model: 13, Stepping: 8)
SSE2 supported but disabled
CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 0
Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE

Playing dvd://.
libdvdread: Using libdvdcss version 1.2.9 for DVD access
libdvdread: Can't stat /dev/dvd
No such file or directory
Couldn't open DVD device: /dev/dvd
[file] No filename
Failed to open dvd://.


Exiting... (End of file)