From: Marco Paniconi <marpan@google.com>
Date: Mon, 5 Nov 2018 17:35:47 +0000 (-0800)
Subject: vp8: Increase rate correction threshold for drop-overshoot
X-Git-Tag: v1.8.0~170^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e161a36a6f5b133adb4eb3174e9530025677eaea;p=libvpx

vp8: Increase rate correction threshold for drop-overshoot

For 1 pass cbr encoding mode, with frame-dropping on:
increase the rate correction threshold for drop-overshoot detection,
to better capture cases of large overshoot.

Change-Id: I1153b1b71cf106749dd985074d6bc8f37d163c7e
---

diff --git a/vp8/encoder/ratectrl.c b/vp8/encoder/ratectrl.c
index fc833bccc..ce07a6f19 100644
--- a/vp8/encoder/ratectrl.c
+++ b/vp8/encoder/ratectrl.c
@@ -1464,7 +1464,7 @@ int vp8_drop_encodedframe_overshoot(VP8_COMP *cpi, int Q) {
       (cpi->oxcf.screen_content_mode == 2 ||
        (cpi->drop_frames_allowed &&
         (force_drop_overshoot ||
-         (cpi->rate_correction_factor < (4.0f * MIN_BPB_FACTOR) &&
+         (cpi->rate_correction_factor < (8.0f * MIN_BPB_FACTOR) &&
           cpi->frames_since_last_drop_overshoot > (int)cpi->framerate))))) {
     // Note: the "projected_frame_size" from encode_frame() only gives estimate
     // of mode/motion vector rate (in non-rd mode): so below we only require