shithub: libvpx

Info  •  Files  •  Log  •  Branches

vp9: Condition lighting change detection on CBR mode.

This feature is used for the CBR RTC encoding mode
at speed >= 6. This change will exclude it for VBR mode.

For speed 6 live encoding (VBR):
avgPSNR/SSIM metrics on ytlive set up by ~1% (few clips up by 2/3%).
No change in speed.

Change-Id: I1a0dd94c334f7df309ab5a48d477d7e25355b798

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -1012,7 +1012,8 @@

   // Detect large lighting change.

   if (cpi->oxcf.content != VP9E_CONTENT_SCREEN &&

-      tmp_variance < (tmp_sse >> 3) && (tmp_sse - tmp_variance) > 10000)

+      cpi->oxcf.rc_mode == VPX_CBR && tmp_variance < (tmp_sse >> 3) &&

+      (tmp_sse - tmp_variance) > 10000)

     x->content_state_sb = kLowVarHighSumdiff;

   else if (tmp_sad > (avg_source_sad_threshold << 1))

     x->content_state_sb = kVeryHighSad;