C:\dev\ruby\sensible-cinema\spec>ruby c:\installs\timer.rb “D:\installs\MPlayer-athlon-xp-svn-32492-mt\MPlayer-athlon-xp-svn-32492-mt\mencoder.exe”   dvd:// -oac copy -lavcopts keyint=1 -ovc lavc -o to_here.avi.fulli.tmp.aviD:\installs\MPlayer-athlon-xp-svn-32492-mt\MPlayer-athlon-xp-svn-32492-mt\mencoder.exe dvd:// -oac copy -lavcopts keyint=1 -ovc lavc -o to_here.avi.fulli.tmp.aviMEncoder SVN-r32492-4.2.5 (C) 2000-2010 MPlayer TeamSSE2 supported but disabledlibdvdread: Using libdvdcss version 1.2.10 for DVD accesslibdvdread: Could not open D: with libdvdcss.libdvdread: Can’t open D: for readingCouldn’t open DVD device: D: (No error)No stream found to handle url dvd://Cannot open file/device.
Exiting…0.048019

meant “you need to specify the dvd device, because it’s not your D drive”
C:\dev\ruby\sensible-cinema\spec>timer “D:\installs\MPlayer-athlon-xp-svn-32492-mt\MPlayer-athlon-xp-svn-32492-mt\mencoder.exe”   dvd:// -oac copy -lavcopts keyint=1 -ovc lavc -o to_here.avi.fulli.tmp.avi -dvd-device e:\