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vp9: Adjust rate_err threshold for setting active_worst factor.

Only affects 1 pass vbr.
Small improvement on ytlive set.

Change-Id: I09a7456fe658fbea82ece1035cf683bd8bd8bd14

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

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

@@ -2138,7 +2138,7 @@

     // Adjust factors for active_worst setting & af_ratio for next gf interval.

     rc->fac_active_worst_inter = 150;  // corresponds to 3/2 (= 150 /100).

     rc->fac_active_worst_gf = 100;

-    if (rate_err < 1.5 && !high_content) {

+    if (rate_err < 2.0 && !high_content) {

       rc->fac_active_worst_inter = 120;

       rc->fac_active_worst_gf = 90;

     }