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vp9: Be more responsive to massive overshoot.

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Limit oscilation detection in the case where overshoot is very very
large.

This keeps the 9-bit cost patch from breaking the DownUp reisze test.
The patch pushed us to an 11% undershoot right before a scene cut
causing a 1200% overshoot. (Whereas before we were undershooting by
only 6% before overshooting by 1200%).

Change-Id: Id90ccfab8aba872ccadc45b73b3bb097b895677f
This commit is contained in:
Alex Converse 2016-01-25 12:03:50 -08:00
parent 9e612763f0
commit 4b2b90fed3
1 changed files with 6 additions and 0 deletions
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6
vp9/encoder/vp9_ratectrl.c
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@ -500,6 +500,12 @@ void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi) {
else else
cpi->rc.rc_1_frame = 0; cpi->rc.rc_1_frame = 0;
// Turn off oscilation detection in the case of massive overshoot.
if (cpi->rc.rc_1_frame == -1 && cpi->rc.rc_2_frame == 1 &&
correction_factor > 1000) {
cpi->rc.rc_2_frame = 0;
}
if (correction_factor > 102) { if (correction_factor > 102) {
// We are not already at the worst allowable quality // We are not already at the worst allowable quality
correction_factor = (int)(100 + ((correction_factor - 100) * correction_factor = (int)(100 + ((correction_factor - 100) *