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Enable dual arf with constant q.

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Add second level arf Q adjustment when using dual arfs
in constant Q mode.

Previously in constant Q mode enabling dual arf hurt by ~5%
but with this change the average benefit is ~1-1.5% with some
mid range data points up ~10%.

Note however that it still hurts on some clips including
some very low motion show content.

Change-Id: I5b7789a2f42a6127d9e801cc010c20a7113bdd9b
This commit is contained in:
Paul Wilkins
2014-10-22 13:46:40 +01:00
parent 7cd6330ef3
commit 8fc3ab774f
2 changed files with 8 additions and 2 deletions
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2
vp9/encoder/vp9_encoder.c
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@@ -3417,7 +3417,7 @@ int vp9_get_compressed_data(VP9_COMP *cpi, unsigned int *frame_flags,
// Note that at the moment multi_arf is only configured for 2 pass VBR and
// will not work properly with svc.
if ((oxcf->pass == 2) && !cpi->use_svc &&
(cpi->oxcf.enable_auto_arf > 1) && (cpi->oxcf.rc_mode == VPX_VBR))
(cpi->oxcf.enable_auto_arf > 1))
cpi->multi_arf_allowed = 1;
else
cpi->multi_arf_allowed = 0;

8
vp9/encoder/vp9_ratectrl.c
View File

@@ -971,7 +971,13 @@ static int rc_pick_q_and_bounds_two_pass(const VP9_COMP *cpi,
if (!cpi->refresh_alt_ref_frame) {
active_best_quality = cq_level;
} else {
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
const GF_GROUP *const gf_group = &cpi->twopass.gf_group;
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
// Modify best quality for second level arfs. For mode VPX_Q this
// becomes the baseline frame q.
if (gf_group->rf_level[gf_group->index] == GF_ARF_LOW)
active_best_quality = (active_best_quality + cq_level + 1) / 2;
}
} else {
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);