shithub: libvpx

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Enable arf usage for speed >= 6, 1 pass vbr.

For speed 6 on ytlive set:
On average, speed slowdown ~5%, quality gain ~2%.

Change-Id: Ia18237cc1d52c54d7e2cb3c71f571cf37ef61b44

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -526,6 +526,8 @@

   }

   if (speed >= 6) {

+    if (cpi->oxcf.rc_mode == VPX_VBR && cpi->oxcf.lag_in_frames > 0)

+      sf->use_altref_onepass = 1;

     sf->partition_search_type = VAR_BASED_PARTITION;

     // Turn on this to use non-RD key frame coding mode.

     sf->use_nonrd_pick_mode = 1;