ref: 69541e1decbc193b0b7af328f48e25c96c8e49eb
parent: f92cfa1ca6cfb8422b10e908ad081ab5cbd3cff4
parent: 07ce7751894d98ecec81d1ab68e0d4cf4912fc5b
author: Jim Bankoski <jimbankoski@google.com>
date: Tue Nov 19 09:42:32 EST 2013
Merge "Reduce loop filter in cyclic refresh."
--- a/vp8/encoder/onyx_if.c
+++ b/vp8/encoder/onyx_if.c
@@ -3808,11 +3808,22 @@
/* Setup background Q adjustment for error resilient mode.
* For multi-layer encodes only enable this for the base layer.
- */
+ * Reduce loop filter to reduce "dot" artifacts that can occur for repeated
+ * loop filtering on ZEROMV_LASTREF blocks.
+ * For now reducing it to -32, only for resolutions above CIF and
+ * #temporal_layers < 3 (artifact is hard to see at low spatial resolution
+ * and/or high #temporal layers).
+ */
if (cpi->cyclic_refresh_mode_enabled)
{+ int delta_loop_filter = 0;
+ if (cm->Width > 352 && cm->Height > 288 &&
+ cpi->oxcf.number_of_layers < 3)
+ {+ delta_loop_filter = -32;
+ }
if (cpi->current_layer==0)
- cyclic_background_refresh(cpi, Q, 0);
+ cyclic_background_refresh(cpi, Q, delta_loop_filter);
else
disable_segmentation(cpi);
}