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Merge "Merge two new VBR adjustment schemes."

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This commit is contained in:
Yaowu Xu 2014-04-21 09:11:24 -07:00 committed by Gerrit Code Review
commit a7ecad59b6
2 changed files with 11 additions and 4 deletions
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13
vp9/encoder/vp9_firstpass.c
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@ -2198,7 +2198,7 @@ void vp9_rc_get_first_pass_params(VP9_COMP *cpi) {
// For VBR...adjustment to the frame target based on error from previous frames
void vbr_rate_correction(int * this_frame_target,
const int64_t vbr_bits_off_target) {
int max_delta = *this_frame_target / 10;
int max_delta = (*this_frame_target * 15) / 100;
// vbr_bits_off_target > 0 means we have extra bits to spend
if (vbr_bits_off_target > 0) {
@ -2370,10 +2370,17 @@ void vp9_twopass_postencode_update(VP9_COMP *cpi) {
// kf_group_bits & gf_group_bits to reflect any deviation from the target
// rate in this frame. This alters the allocation of bits to the
// remaning frames in the group / clip.
//
// This method can give rise to unstable behaviour near the end of a clip
// or kf/gf group of frames where any accumulated error is corrected over an
// ever decreasing number of frames.
const int bits_used = rc->projected_frame_size;
// ever decreasing number of frames. Hence we change the balance of target
// vs. actual bitrate gradually as we progress towards the end of the
// sequence in order to mitigate this effect.
const double progress =
(double)(cpi->twopass.stats_in - cpi->twopass.stats_in_start) /
(cpi->twopass.stats_in_end - cpi->twopass.stats_in_start);
const int bits_used = progress * cpi->rc.this_frame_target +
(1.0 - progress) * cpi->rc.projected_frame_size;
#endif
cpi->twopass.bits_left -= bits_used;

2
vp9/encoder/vp9_ratectrl.c
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@ -85,7 +85,7 @@ void vp9_rc_init_minq_luts() {
gf_high_motion_minq[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.50);
afq_low_motion_minq[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.33);
afq_high_motion_minq[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55);
inter_minq[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.55);
inter_minq[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.75);
}
}