Don't pre-calculate first_pixel
3.6% faster on Elephants_Dream_HD-q7-aq7.ogg on my penryn Originally committed as revision 21781 to svn://svn.ffmpeg.org/ffmpeg/trunk
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3.6% faster on Elephants_Dream_HD-q7-aq7.ogg on my penryn Originally committed as revision 21781 to svn://svn.ffmpeg.org/ffmpeg/trunk