This occurs when the destination buffer is packed but the source buffer uses aligned h&w.
patch by John Koleszar < jkoleszar AH on2 POIS com >
original thread:
Date: Apr 11, 2006 4:27 PM
Subject: [MPlayer-dev-eng] [PATCH] Chroma plane copy in vf_expand
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@18322 b3059339-0415-0410-9bf9-f77b7e298cf2