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vp9-noise estimate: Adhust threshold for Low level detection.

Change-Id: I1c78255c81cb4ac218964c80f8ecaf29f95b875b

--- a/vp9/encoder/vp9_noise_estimate.c

+++ b/vp9/encoder/vp9_noise_estimate.c

@@ -91,7 +91,7 @@

   } else {

     if (ne->value > ne->thresh)

       noise_level = kMedium;

-    else if (ne->value > ((5 * ne->thresh) >> 3))

+    else if (ne->value > ((9 * ne->thresh) >> 4))

       noise_level = kLow;

     else

       noise_level = kLowLow;