add support for more pixel format (yuv422p, yuv444p, etc instead of yuv420 only.)

patch by Limin Wang %lance P lmwang A gmail P com%
Original thread:
date: Feb 14, 2007 12:13 PM
subject: [Ffmpeg-devel] [PATCH] let ffplay can play more pixel format

Originally committed as revision 8063 to svn://svn.ffmpeg.org/ffmpeg/trunk