shithub: libvpx

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vp9: Adjustment to scene-cut detection.

Change recursive weight for average_source_sad and
put some constraint on spacing between detected scene-cuts.

Change only affects 1 pass real-time mode.

Change-Id: I1917e748d845e244812d11aec2a9d755372ec182

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

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

@@ -1687,6 +1687,7 @@

   cpi->common.buffer_pool = pool;

   cpi->rc.high_source_sad = 0;

+  cpi->rc.count_last_scene_change = 0;

   init_config(cpi, oxcf);

   vp9_rc_init(&cpi->oxcf, oxcf->pass, &cpi->rc);

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -2084,10 +2084,11 @@

     else

       rc->high_source_sad = 0;

     if (avg_sad > 0 || cpi->oxcf.rc_mode == VPX_CBR)

-      rc->avg_source_sad = (rc->avg_source_sad + avg_sad) >> 1;

+      rc->avg_source_sad = (3 * rc->avg_source_sad + avg_sad) >> 2;

     // For VBR, under scene change/high content change, force golden refresh.

     if (cpi->oxcf.rc_mode == VPX_VBR &&

         rc->high_source_sad &&

+        rc->count_last_scene_change > 4 &&

         cpi->ext_refresh_frame_flags_pending == 0) {

       int target;

       cpi->refresh_golden_frame = 1;

@@ -2099,6 +2100,9 @@

         rc->frames_till_gf_update_due = rc->frames_to_key;

       target = calc_pframe_target_size_one_pass_vbr(cpi);

       vp9_rc_set_frame_target(cpi, target);

+      rc->count_last_scene_change = 0;

+    } else {

+      rc->count_last_scene_change++;

     }

   }

 }

--- a/vp9/encoder/vp9_ratectrl.h

+++ b/vp9/encoder/vp9_ratectrl.h

@@ -161,6 +161,7 @@

   uint64_t avg_source_sad;

   int high_source_sad;

+  int count_last_scene_change;

 } RATE_CONTROL;

 struct VP9_COMP;