Commit d488236c authored by Marco's avatar Marco

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

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
parent 2e084193
......@@ -948,11 +948,15 @@ static int rc_pick_q_and_bounds_one_pass_vbr(const VP9_COMP *cpi,
FIXED_GF_INTERVAL], cm->bit_depth);
active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
} else {
// Use the lower of active_worst_quality and recent/average Q.
if (cm->current_video_frame > 1)
active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
else
// Use the min of the average Q (with some increase) and
// active_worst_quality as basis for active_best.
if (cm->current_video_frame > 1) {
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]];
}
// For the constrained quality mode we don't want
// q to fall below the cq level.
if ((oxcf->rc_mode == VPX_CQ) &&
......
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