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vp9: Adjustment to active_best_quality for inter_frame, 1 pass vbr.

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Change only affects 1 pass vbr.

Use a q value somewhat larger (~6%) than avg_frame_qindex[INTER]
as basis for active_best_quality for inter-frames.
And use the minium of this (avg_frame_qindex) and the active_worst_quality.

This reduces some overshoot in ytlive clips.
Overall small but positive average increase in metrics (up on average ~0.2%).

Change-Id: Icdbaae7872d5675fd38a13c0ec6ce0e2e3b919ce
This commit is contained in:
Marco 2016-04-15 10:06:18 -07:00
parent 2e0841931c
commit d488236ce3
1 changed files with 8 additions and 4 deletions
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12
vp9/encoder/vp9_ratectrl.c
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@ -948,11 +948,15 @@ static int rc_pick_q_and_bounds_one_pass_vbr(const VP9_COMP *cpi,
FIXED_GF_INTERVAL], cm->bit_depth); FIXED_GF_INTERVAL], cm->bit_depth);
active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality); active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
} else { } else {
// Use the lower of active_worst_quality and recent/average Q. // Use the min of the average Q (with some increase) and
if (cm->current_video_frame > 1) // active_worst_quality as basis for active_best.
active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]]; if (cm->current_video_frame > 1) {
else q = VPXMIN(((17 * rc->avg_frame_qindex[INTER_FRAME]) >> 4),
active_worst_quality);
active_best_quality = inter_minq[q];
} else {
active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]]; active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
}
// For the constrained quality mode we don't want // For the constrained quality mode we don't want
// q to fall below the cq level. // q to fall below the cq level.
if ((oxcf->rc_mode == VPX_CQ) && if ((oxcf->rc_mode == VPX_CQ) &&