Its functionality has been superseeded by sws by quite some time, and
the "swap" functionality is now provided by vf_format.
see http://comments.gmane.org/gmane.comp.video.mplayer.devel/55804 for
a full discussion.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@31350 b3059339-0415-0410-9bf9-f77b7e298cf2