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Rate control adjustment.

Small adjustment to the active Q range calculations.
These changes should slightly extend the available Q range
for KF/GF/ARF and narrow it for other frames.

The results for this change in isolation are broadly positive
for SSIM and average PSNR and slightly up but mixed for opsnr.

derf +0.293% opsnr, +1.286% SSIM
std-hd + 0.528% opsnr, + 1.746% SSIM
yt +0.056% opsnr, +0.457% SSIM
yt-hd -0.147% opsnr, + 0.226% SSIM

Change-Id: If065280342027ecc5d44b49fc1d440dfef041002

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -81,13 +81,13 @@

   for (i = 0; i < QINDEX_RANGE; i++) {

     const double maxq = vp9_convert_qindex_to_q(i);

-    kf_low_motion_minq[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.15);

+    kf_low_motion_minq[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.125);

     kf_high_motion_minq[i] = get_minq_index(maxq, 0.000002, -0.0012, 0.50);

-    gf_low_motion_minq[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.32);

+    gf_low_motion_minq[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30);

     gf_high_motion_minq[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.50);

-    afq_low_motion_minq[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.33);

+    afq_low_motion_minq[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30);

     afq_high_motion_minq[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55);

-    inter_minq[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.75);

+    inter_minq[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.90);

   }

 }

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