to generate valid mpeg output from avi's that have duplicate frames in
them, or when using inverse telecine filters. to use it, put the
"harddup" filter at the end of your filter chain.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@12335 b3059339-0415-0410-9bf9-f77b7e298cf2