vp9: Use nonrd_pick_partition on scene-cut, for speed 5 vbr mode.

On scene-cut detected frames (i.e., high_source_sad = 1), use
nonrd_pick_partition (over choose_part + select_part), as
the nonrd_pick partitioning is generally better.

Small positive increase in metrics on ytlive set (~0.5 - 1%).
Negligle overall speed decrease, as its only used on scene-cut frames.

Only affects 1 pass vbr mode, speed = 5.

Change-Id: I07c89cbdc75f5bb16eb8e0e2773ead0980d2de5c

diff --git a/vp9/encoder/vp9_encodeframe.c b/vp9/encoder/vp9_encodeframe.c
index e357050..21a66bb 100644 (file)
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -3797,8 +3797,14 @@ static void encode_nonrd_sb_row(VP9_COMP *cpi,
         break;
       case REFERENCE_PARTITION:
         set_offsets(cpi, tile_info, x, mi_row, mi_col, BLOCK_64X64);
-        if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled &&
-            xd->mi[0]->segment_id) {
+        // Use nonrd_pick_partition on scene-cut for VBR, or on qp-segment
+        // if cyclic_refresh is enabled.
+        // nonrd_pick_partition does not support 4x4 partition, so avoid it
+        // on key frame for now.
+        if ((cpi->oxcf.rc_mode == VPX_VBR && cpi->rc.high_source_sad &&
+            cm->frame_type != KEY_FRAME) ||
+            (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled &&
+            xd->mi[0]->segment_id)) {
           // Use lower max_partition_size for low resoultions.
           if (cm->width <= 352 && cm->height <= 288)
             x->max_partition_size = BLOCK_32X32;