ref: 17ef6a8dfd31fc5787d291dfc254d3acd5d814ef
parent: befb0393c5eb835a8aa53d101edc204d80400048
author: Paul Wilkins <paulwilkins@google.com>
date: Tue Mar 26 10:40:24 EDT 2013
Adjust mv_ratio_accumulator threshold. This threshold effectively limits the amount of motion from one end of a GF/ARF group to the other. This patch makes the threshold depend on image size. Change-Id: Id45d1d7bced815f86ddd037be53164894b00b82f
--- a/vp9/encoder/vp9_firstpass.c
+++ b/vp9/encoder/vp9_firstpass.c
@@ -1536,7 +1536,7 @@
double this_frame_mv_in_out = 0.0;
double mv_in_out_accumulator = 0.0;
double abs_mv_in_out_accumulator = 0.0;
-
+ double mv_ratio_accumulator_thresh;
int max_bits = frame_max_bits(cpi); // Max for a single frame
unsigned int allow_alt_ref =
@@ -1568,10 +1568,8 @@
if (cpi->common.frame_type == KEY_FRAME)
gf_group_err -= gf_first_frame_err;
- // Scan forward to try and work out how many frames the next gf group
- // should contain and what level of boost is appropriate for the GF
- // or ARF that will be coded with the group
- i = 0;
+ // Motion breakout threshold for loop below depends on image size.
+ mv_ratio_accumulator_thresh = (cpi->common.width + cpi->common.height) / 10.0;
// Work out a maximum interval for the GF.
// If the image appears completely static we can extend beyond this.
@@ -1585,6 +1583,7 @@
if (active_max_gf_interval > cpi->max_gf_interval)
active_max_gf_interval = cpi->max_gf_interval;
+ i = 0;
while (((i < cpi->twopass.static_scene_max_gf_interval) ||
((cpi->twopass.frames_to_key - i) < MIN_GF_INTERVAL)) &&
(i < cpi->twopass.frames_to_key)) {@@ -1644,7 +1643,7 @@
((cpi->twopass.frames_to_key - i) >= MIN_GF_INTERVAL) &&
((boost_score > 125.0) || (next_frame.pcnt_inter < 0.75)) &&
(!flash_detected) &&
- ((mv_ratio_accumulator > 100.0) ||
+ ((mv_ratio_accumulator > mv_ratio_accumulator_thresh) ||
(abs_mv_in_out_accumulator > 3.0) ||
(mv_in_out_accumulator < -2.0) ||
((boost_score - old_boost_score) < IIFACTOR))