tree 5eef940fc1950d5d132929694623b4d4b94a4c6d
parent c7005a293ac49a44fddb92cd7c1ac67272d1b28e
author chiyotsai <chiyotsai@google.com> 1660777187 -0700
committer chiyotsai <chiyotsai@google.com> 1661274410 -0700

RTC: Disable compound modes based on variance

This commit introduces speed feature skip_compound_based_on_var that
skips all compound modes if the best single mode prediction has low
residual variance.

Furthermore, this commit also disables the sad_based_comp_prune speed
feature on speed 9, 10 as variance of best mode outperforms the SAD
of zeromv on last frame. Note that the speed feature is disabled by
inserting a 0 into the conditional. This is because there are other
speed features that relies on the stats collected by
sad_based_comp_prune. This will be corrected in a later commit.

Performance:
| SPD_SET | TESTSET  | AVG_PSNR | OVR_PSNR |  SSIM   | ENC_T |
|---------|----------|----------|----------|---------|-------|
|    7    |   rtc    | +0.035%  | +0.219%  | +0.252% | -0.3% |
|---------|----------|----------|----------|---------|-------|
|    8    |   rtc    | +0.026%  | +0.027%  | +0.137% | -0.3% |
|---------|----------|----------|----------|---------|-------|
|    9    |   rtc    | -0.169%  | -0.060%  | +0.253% | -0.3% |
|---------|----------|----------|----------|---------|-------|
|   10    |   rtc    | -0.007%  | -0.018%  | +0.140% | -0.2% |

The larger PSNR loss on speed 7 is caused by thaloundeskmtgvga.y4m.

STATS_CHANGED

Change-Id: I7f663ddbf316fe75f5827ee0a8367ca50d691b0c