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Key frame and GF sizing changes.

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Changes to the equations for kf and gf minQ and to
the boost calculations for kg and gf

Change-Id: I312031c910e6a575334f49075c32f49a8dfff239
This commit is contained in:
Paul Wilkins 2012-06-07 13:39:20 +01:00
parent b8c369053b
commit 0cb4985b51
3 changed files with 71 additions and 40 deletions
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33
vp8/encoder/firstpass.c
View File

@ -52,8 +52,8 @@ extern void vp8_alloc_compressor_data(VP8_COMP *cpi);
#define IIFACTOR 12.5
#define IIKFACTOR1 12.5
#define IIKFACTOR2 12.5
#define RMAX 96.0
#define IIKFACTOR2 15.0
#define RMAX 128.0
#define GF_RMAX 96.0
#define ERR_DIVISOR 150.0
@ -1716,8 +1716,12 @@ static void define_gf_group(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame)
decay_accumulator = decay_accumulator * loop_decay_rate;
// Monitor for static sections.
zero_motion_accumulator *=
(next_frame.pcnt_inter - next_frame.pcnt_motion);
if ( (next_frame.pcnt_inter - next_frame.pcnt_motion) <
zero_motion_accumulator )
{
zero_motion_accumulator =
(next_frame.pcnt_inter - next_frame.pcnt_motion);
}
// Break clause to detect very still sections after motion
// (for example a staic image after a fade or other transition).
@ -2525,7 +2529,7 @@ static void find_next_key_frame(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame)
boost_score = 0.0;
loop_decay_rate = 1.00; // Starting decay rate
for (i = 0 ; i < cpi->twopass.frames_to_key ; i++)
for (i = 0; i < cpi->twopass.frames_to_key; i++)
{
double r;
@ -2543,8 +2547,12 @@ static void find_next_key_frame(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame)
r = RMAX;
// Monitor for static sections.
zero_motion_accumulator *=
(next_frame.pcnt_inter - next_frame.pcnt_motion);
if ( (next_frame.pcnt_inter - next_frame.pcnt_motion) <
zero_motion_accumulator )
{
zero_motion_accumulator =
(next_frame.pcnt_inter - next_frame.pcnt_motion);
}
// How fast is prediction quality decaying
loop_decay_rate = get_prediction_decay_rate(cpi, &next_frame);
@ -2582,15 +2590,14 @@ static void find_next_key_frame(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame)
kf_boost = 300;
}
// bigger frame sizes need larger kf boosts, smaller frames smaller boosts...
if ((lst_yv12->y_width * lst_yv12->y_height) > (320 * 240))
kf_boost += 12 * (lst_yv12->y_width * lst_yv12->y_height) / (320 * 240);
else if ((lst_yv12->y_width * lst_yv12->y_height) < (320 * 240))
kf_boost -= 25 * (320 * 240) / (lst_yv12->y_width * lst_yv12->y_height);
if (kf_boost < 250) // Min KF boost
kf_boost = 250;
// Make a not of baseline boost and the zero motion
// accumulator value for use elsewhere.
cpi->kf_boost = kf_boost;
cpi->kf_zeromotion_pct = (int)(zero_motion_accumulator * 100.0);
// We do three calculations for kf size.
// The first is based on the error score for the whole kf group.
// The second (optionaly) on the key frames own error if this is

75
vp8/encoder/onyx_if.c
View File

@ -181,7 +181,6 @@ int vp8cx_base_skip_false_prob[QINDEX_RANGE];
static int kf_low_motion_minq[QINDEX_RANGE];
static int kf_high_motion_minq[QINDEX_RANGE];
static int gf_low_motion_minq[QINDEX_RANGE];
static int gf_mid_motion_minq[QINDEX_RANGE];
static int gf_high_motion_minq[QINDEX_RANGE];
static int inter_minq[QINDEX_RANGE];
@ -227,26 +226,20 @@ void init_minq_luts()
-0.000015,
0.074,
0.0 );
kf_high_motion_minq[i] = calculate_minq_index( maxq,
0.00000034,
0.0000004,
-0.000125,
0.13,
0.14,
0.0 );
gf_low_motion_minq[i] = calculate_minq_index( maxq,
0.0000016,
-0.00078,
0.315,
0.0 );
gf_mid_motion_minq[i] = calculate_minq_index( maxq,
0.00000415,
-0.0017,
0.425,
0.0000015,
-0.0009,
0.33,
0.0 );
gf_high_motion_minq[i] = calculate_minq_index( maxq,
0.00000725,
-0.00235,
0.47,
0.0000021,
-0.00125,
0.45,
0.0 );
inter_minq[i] = calculate_minq_index( maxq,
0.00000271,
@ -3016,10 +3009,28 @@ static void encode_frame_to_data_rate
if ( cm->frame_type == KEY_FRAME )
{
if (cpi->gfu_boost > 600)
cpi->active_best_quality = kf_low_motion_minq[Q];
int high = 2000;
int low = 400;
if ( cpi->kf_boost > high )
cpi->active_best_quality = kf_low_motion_minq[Q];
else if ( cpi->kf_boost < low )
cpi->active_best_quality = kf_high_motion_minq[Q];
else
cpi->active_best_quality = kf_high_motion_minq[Q];
{
int gap = high - low;
int offset = high - cpi->kf_boost;
int qdiff = kf_high_motion_minq[Q] - kf_low_motion_minq[Q];
int adjustment = ((offset * qdiff) + (gap>>1)) / gap;
cpi->active_best_quality = kf_low_motion_minq[Q] + adjustment;
}
// Make an adjustment based on the %s static
// The main impact of this is at lower Q to prevent overly large key
// frames unless a lot of the image is static.
if (cpi->kf_zeromotion_pct < 64 )
cpi->active_best_quality += 4 - (cpi->kf_zeromotion_pct >> 4);
// Special case for key frames forced because we have reached
// the maximum key frame interval. Here force the Q to a range
@ -3040,6 +3051,9 @@ static void encode_frame_to_data_rate
else if (cm->refresh_golden_frame || cpi->common.refresh_alt_ref_frame)
{
int high = 2000;
int low = 400;
// Use the lower of cpi->active_worst_quality and recent
// average Q as basis for GF/ARF Q limit unless last frame was
// a key frame.
@ -3056,12 +3070,19 @@ static void encode_frame_to_data_rate
Q = cpi->cq_target_quality;
}
if ( cpi->gfu_boost > 1000 )
if ( cpi->gfu_boost > high )
cpi->active_best_quality = gf_low_motion_minq[Q];
else if ( cpi->gfu_boost < 400 )
else if ( cpi->gfu_boost < low )
cpi->active_best_quality = gf_high_motion_minq[Q];
else
cpi->active_best_quality = gf_mid_motion_minq[Q];
{
int gap = high - low;
int offset = high - cpi->gfu_boost;
int qdiff = gf_high_motion_minq[Q] - gf_low_motion_minq[Q];
int adjustment = ((offset * qdiff) + (gap>>1)) / gap;
cpi->active_best_quality = gf_low_motion_minq[Q] + adjustment;
}
// Constrained quality use slightly lower active best.
if ( cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY )
@ -3765,7 +3786,7 @@ static void encode_frame_to_data_rate
// in this frame.
update_base_skip_probs( cpi );
#if 0 && CONFIG_INTERNAL_STATS
#if 1 && CONFIG_INTERNAL_STATS
{
FILE *f = fopen("tmp.stt", "a");
int recon_err;
@ -3780,7 +3801,7 @@ static void encode_frame_to_data_rate
fprintf(f, "%10d %10d %10d %10d %10d %10d %10d %10d"
"%7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f"
"%6d %5d %5d %5d %8d %8.2f %10d %10.3f"
"%10.3f %8d %10d\n",
"%10.3f %8d %10d %10d %10d\n",
cpi->common.current_video_frame, cpi->this_frame_target,
cpi->projected_frame_size, loop_size_estimate,
(cpi->projected_frame_size - cpi->this_frame_target),
@ -3803,12 +3824,13 @@ static void encode_frame_to_data_rate
cpi->twopass.total_left_stats->coded_error,
(double)cpi->twopass.bits_left /
cpi->twopass.total_left_stats->coded_error,
cpi->tot_recode_hits, recon_err);
cpi->tot_recode_hits, recon_err, cpi->kf_boost,
cpi->kf_zeromotion_pct);
else
fprintf(f, "%10d %10d %10d %10d %10d %10d %10d %10d"
"%7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f"
"%6d %5d %5d %5d %8d %8.2f %10d %10.3f"
"%8d %10d\n",
"%8d %10d %10d %10d\n",
cpi->common.current_video_frame,
cpi->this_frame_target, cpi->projected_frame_size,
loop_size_estimate,
@ -3830,7 +3852,8 @@ static void encode_frame_to_data_rate
cpi->twopass.est_max_qcorrection_factor,
(int)cpi->twopass.bits_left,
cpi->twopass.total_left_stats->coded_error,
cpi->tot_recode_hits, recon_err);
cpi->tot_recode_hits, recon_err, cpi->kf_boost,
cpi->kf_zeromotion_pct);
fclose(f);

3
vp8/encoder/onyx_int.h
View File

@ -471,8 +471,9 @@ typedef struct VP8_COMP
unsigned int frame_branch_ct_8x8 [BLOCK_TYPES_8X8] [COEF_BANDS] [PREV_COEF_CONTEXTS] [ENTROPY_NODES][2];
int gfu_boost;
int kf_boost;
int last_boost;
int kf_boost;
int kf_zeromotion_pct;
int target_bandwidth;
struct vpx_codec_pkt_list *output_pkt_list;