Patch by tripp eliared yahoo com
Originally committed as revision 14333 to svn://svn.ffmpeg.org/ffmpeg/trunk
@item -qdiff @var{q}
maximum difference between the quantizer scales (VBR)
@item -qblur @var{blur}
-video quantizer scale blur (VBR)
+video quantizer scale blur (VBR) (range 0.0 - 1.0)
@item -qcomp @var{compression}
-video quantizer scale compression (VBR)
+video quantizer scale compression (VBR) (default 0.5).
+Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
@item -lmin @var{lambda}
minimum video lagrange factor (VBR)