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vp8: Adjust threshold to set the gf_noboost flag.

Change only affects 1 pass cbr, with error_resilient off.

Change-Id: Ibf254d8772fa2a8f188c9932d37b2f42362d8003

--- a/vp8/encoder/ratectrl.c

+++ b/vp8/encoder/ratectrl.c

@@ -1010,7 +1010,7 @@

       // If gf_cbr_boost_pct is small (below threshold) set the flag

       // gf_noboost_onepass_cbr = 1, which forces the gf to use the same

       // rate correction factor as last.

-      cpi->gf_noboost_onepass_cbr = (cpi->oxcf.gf_cbr_boost_pct <= 50);

+      cpi->gf_noboost_onepass_cbr = (cpi->oxcf.gf_cbr_boost_pct <= 100);

       cpi->this_frame_target =

           (cpi->this_frame_target * (100 + cpi->oxcf.gf_cbr_boost_pct)) / 100;

       cpi->baseline_gf_interval = cpi->gf_interval_onepass_cbr;