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vp9: Reduce frame loopfilter-level for 1 pass cbr.

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Reduce the filt_guess for 1 pass cbr on inter-frames.
This reduces visual artifact seen in rtc clip (jimred.vga),
and improves metrics on rtc set.

Metrics on rtc set for cbr mode overall positive, most clips are up:
Speed 7 rtc: avgPSNR/SSIM up by: ~2.6/3.9%
Speed 8 rtc: avgPSNR/SSIM up by: ~1.3/2.5%

Change-Id: Ia4eccea1c19d65b583516df28823cd756c49464f
This commit is contained in:
Marco 2016-09-26 09:57:49 -07:00
parent b46243d7ff
commit d9fc28c0a1
1 changed files with 4 additions and 0 deletions
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4
vp9/encoder/vp9_picklpf.c
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@ -180,6 +180,10 @@ void vp9_pick_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
}
#else
int filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 18);
if (cpi->oxcf.pass == 0 && cpi->oxcf.rc_mode == VPX_CBR &&
cpi->oxcf.content != VP9E_CONTENT_SCREEN && cm->frame_type != KEY_FRAME)
filt_guess = 5 * filt_guess >> 3;
#endif // CONFIG_VP9_HIGHBITDEPTH
if (cm->frame_type == KEY_FRAME) filt_guess -= 4;
lf->filter_level = clamp(filt_guess, min_filter_level, max_filter_level);