shithub: libvpx

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Merge "Lower bitrate threshold below which cyclic refresh is turned off."

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c

@@ -77,10 +77,10 @@

   // with number of seg blocks, so compare available bits to number of blocks.

   // Average bits available per frame = avg_frame_bandwidth

   // Number of (8x8) blocks in frame = mi_rows * mi_cols;

-  const float factor  = 0.5;

+  const float factor = 0.25;

   const int number_blocks = cm->mi_rows  * cm->mi_cols;

   // The condition below corresponds to turning off at target bitrates:

-  // ~24kbps for CIF, 72kbps for VGA (at 30fps).

+  // (at 30fps), ~12kbps for CIF, 36kbps for VGA, 100kps for HD/720p.

   // Also turn off at very small frame sizes, to avoid too large fraction of

   // superblocks to be refreshed per frame. Threshold below is less than QCIF.

   if (rc->avg_frame_bandwidth < factor * number_blocks ||