what may cause error of could not find demuxer

[eric <lshih@qwest.net>]

Dear linux video experts:

do you know what may cause
audio driver '(null)' init failed - no audio.
xine_init: audio thread created
input plugin found : 
/usr/local/lib/xine/plugins/input_file.so(input_file.so)
input plugin found : /usr/local/lib/xine/plugins/input_net.so(input_net.so)
input_dvd: unable to open raw dvd drive (/dev/rdvd): No such file or 
directory
input plugin found : /usr/local/lib/xine/plugins/input_dvd.so(input_dvd.so)
input plugin found : /usr/local/lib/xine/plugins/input_vcd.so(input_vcd.so)
input plugin found : 
/usr/local/lib/xine/plugins/input_stdin_fifo.so(input_stdin_fifo.so)
xine_init: plugins loaded
input_dvd: get_autoplay_list
error: couldn't find demuxer for >DROP A FILE ON XINE<
input_dvd: get_autoplay_list
error: couldn't find demuxer for >DROP A FILE ON XINE<

when I tried to watch dvd movie by xine?

hope to see your tech help

sincere
eric