ref: 939791a129819951bbdd187ba022d456efbc21d6
parent: f4a6f936b5b65322854392f7b9625e4b4151ba37
author: Yunqing Wang <yunqingwang@google.com>
date: Thu Sep 5 13:10:58 EDT 2013
Modify encode breakout for static frames Thank Paul for the suggestions. While turning on static-thresh for static-image videos, a big jump on bitrate was seen. In this patch, we detected static frames in the video using first-pass stats. For different cases, disable encode breakout or reduce encode breakout threshold to limit the skipping. More modification need be done to break incorrect partition picking pattern for static frames while skipping happens. Change-Id: Ia25f47041af0f04e229c70a0185e12b0ffa6047f
--- a/vp9/encoder/vp9_firstpass.c
+++ b/vp9/encoder/vp9_firstpass.c
@@ -1717,6 +1717,8 @@
old_boost_score = boost_score;
}
+ cpi->gf_zeromotion_pct = (int)(zero_motion_accumulator * 1000.0);
+
// Don't allow a gf too near the next kf
if ((cpi->twopass.frames_to_key - i) < MIN_GF_INTERVAL) { while (i < cpi->twopass.frames_to_key) {@@ -2162,6 +2164,8 @@
// Define next gf group and assign bits to it
this_frame_copy = this_frame;
+ cpi->gf_zeromotion_pct = 0;
+
#if CONFIG_MULTIPLE_ARF
if (cpi->multi_arf_enabled) {define_fixed_arf_period(cpi);
@@ -2171,6 +2175,15 @@
#if CONFIG_MULTIPLE_ARF
}
#endif
+
+ if (cpi->gf_zeromotion_pct > 995) {+ // As long as max_thresh for encode breakout is small enough, it is ok
+ // to enable it for no-show frame, i.e. set enable_encode_breakout to 2.
+ if (!cpi->common.show_frame)
+ cpi->enable_encode_breakout = 0;
+ else
+ cpi->enable_encode_breakout = 2;
+ }
// If we are going to code an altref frame at the end of the group
// and the current frame is not a key frame....
--- a/vp9/encoder/vp9_onyx_if.c
+++ b/vp9/encoder/vp9_onyx_if.c
@@ -1590,6 +1590,8 @@
cpi->output_pkt_list = oxcf->output_pkt_list;
+ cpi->enable_encode_breakout = 1;
+
if (cpi->pass == 1) {vp9_init_first_pass(cpi);
} else if (cpi->pass == 2) {@@ -3618,6 +3620,8 @@
static void Pass2Encode(VP9_COMP *cpi, unsigned long *size,
unsigned char *dest, unsigned int *frame_flags) {+
+ cpi->enable_encode_breakout = 1;
if (!cpi->refresh_alt_ref_frame)
vp9_second_pass(cpi);
--- a/vp9/encoder/vp9_onyx_int.h
+++ b/vp9/encoder/vp9_onyx_int.h
@@ -495,6 +495,7 @@
int last_boost;
int kf_boost;
int kf_zeromotion_pct;
+ int gf_zeromotion_pct;
int64_t target_bandwidth;
struct vpx_codec_pkt_list *output_pkt_list;
@@ -656,6 +657,8 @@
int initial_height;
int number_spatial_layers;
+ int enable_encode_breakout; // Default value is 1. From first pass stats,
+ // encode_breakout may be disabled.
#if CONFIG_MULTIPLE_ARF
// ARF tracking variables.
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -2861,7 +2861,7 @@
if (cpi->common.mcomp_filter_type == SWITCHABLE)
*rate2 += get_switchable_rate(x);
- if (!is_comp_pred) {+ if (!is_comp_pred && cpi->enable_encode_breakout) {if (cpi->active_map_enabled && x->active_ptr[0] == 0)
x->skip = 1;
else if (x->encode_breakout) {@@ -2872,17 +2872,22 @@
unsigned int thresh_ac;
// The encode_breakout input
unsigned int encode_breakout = x->encode_breakout << 4;
+ int max_thresh = 36000;
+ // Use extreme low threshold for static frames to limit skipping.
+ if (cpi->enable_encode_breakout == 2)
+ max_thresh = 128;
+
// Calculate threshold according to dequant value.
thresh_ac = (xd->plane[0].dequant[1] * xd->plane[0].dequant[1]) / 9;
- // Set a maximum for threshold to avoid big PSNR loss in low bitrate case.
- if (thresh_ac > 36000)
- thresh_ac = 36000;
-
// Use encode_breakout input if it is bigger than internal threshold.
if (thresh_ac < encode_breakout)
thresh_ac = encode_breakout;
+
+ // Set a maximum for threshold to avoid big PSNR loss in low bitrate case.
+ if (thresh_ac > max_thresh)
+ thresh_ac = max_thresh;
var = cpi->fn_ptr[y_size].vf(x->plane[0].src.buf, x->plane[0].src.stride,
xd->plane[0].dst.buf,
--
⑨