shithub: libvpx

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Correct rq_model_update when recode_count == 1

This will reduce the avg recode times per frame form
3.19 to 2.81 when targeting 15% error margin for
target bitrate per frame.

Change-Id: I28c9ec09a1b1318c09fe5229ccb7e51b32b9dfb9

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -4324,7 +4324,7 @@

       const double prev_q_step = vp9_convert_qindex_to_q(prev_q, VPX_BITS_8);

       const int actual_bits = rq_history->rate_history[recode_count - 1];

       rq_model->ratio =

-          rq_model->ratio - (target_bits - actual_bits) / log2(prev_q_step);

+          rq_model->ratio + (target_bits - actual_bits) / log2(prev_q_step);

     }

   }

 }