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Adjust mv_ratio_accumulator threshold.

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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
This commit is contained in:
Paul Wilkins 2013-03-26 14:40:24 +00:00
parent befb0393c5
commit 17ef6a8dfd
1 changed files with 5 additions and 6 deletions
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11
vp9/encoder/vp9_firstpass.c
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@ -1536,7 +1536,7 @@ static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
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 @@ static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
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 @@ static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
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 @@ static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
((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))