libavformat file format detected.
LAVF_header: av_open_input_stream() failed
Exiting... (End of file)
So I did
$ mplayer -v
MPlayer 1.0rc1-4.1.2-DFSG-free (C) 2000-2006 MPlayer Team
...
get_path('codecs.conf') -> '/home/brownh/.mplayer/codecs.conf'
Reading /home/brownh/.mplayer/codecs.conf:
Can't open '/home/brownh/.mplayer/codecs.conf':
No such file or directory
Reading /etc/mplayer/codecs.conf: Can't open
'/etc/mplayer/codecs.conf': No such file or directory
Using built-in default codecs.conf.
...
You do not need win32codecs to play DVDs. Also, I don't really think
codecs.conf is necessary.
Perhaps you need the libdvdcss2 library to decrypt encrypted DVDs.
Debian does not carry it, but you can get it from
www.debian-multimedia.org . I don't know if the standard Debian version
of mplayer can use it even if it is installed by the user, but you'd
probably be better off using the mplayer from debian-multimedia anyway.