Enable use_altref_onepass for speed 4 real-time mode.

Used for VBR mode with lag-in-frames > 0.
On ytlive set at speed 4: ~3% average gain.

Change-Id: I45dad1700bf8be9d8f177815dc062774f6f2f0de

diff --git a/vp9/encoder/vp9_speed_features.c b/vp9/encoder/vp9_speed_features.c
index c1646c8..f49d8e4 100644 (file)
--- a/vp9/encoder/vp9_speed_features.c
+++ b/vp9/encoder/vp9_speed_features.c
@@ -443,6 +443,8 @@ static void set_rt_speed_feature_framesize_independent(
 
   if (speed >= 4) {
     int i;
+    if (cpi->oxcf.rc_mode == VPX_VBR && cpi->oxcf.lag_in_frames > 0)
+      sf->use_altref_onepass = 1;
     sf->last_partitioning_redo_frequency = 4;
     sf->adaptive_rd_thresh = 5;
     sf->use_fast_coef_costing = 0;
@@ -468,6 +470,7 @@ static void set_rt_speed_feature_framesize_independent(
   }
 
   if (speed >= 5) {
+    sf->use_altref_onepass = 0;
     sf->use_quant_fp = !is_keyframe;
     sf->auto_min_max_partition_size =
         is_keyframe ? RELAXED_NEIGHBORING_MIN_MAX : STRICT_NEIGHBORING_MIN_MAX;