shithub: libvpx

Download patch

ref: d6f4b71d9f895dd77624022cbe0fbbc40dbdf03f
parent: d56acae6601dba8e867c06df24b453c3645e195a
author: Yaowu Xu <yaowu@google.com>
date: Wed Apr 4 03:24:10 EDT 2012

Adjust the key frame placement condition

The commit removed a limit on key frame detection, which caused a big
drop in all metric measurements for standard HD clip such as _mobcal.

This single change helps two standard HD clips by a huge amount, which
help the overall std-hd set by 2.4% (glb psnr), 0.9% (avg_psnr), 2.1%
(vpxssim).

In the result page:
http://pafr9.prod.google.com:26163/?/cns/rc-d/home/on2-prod/sunkaras/borg-test/yaowu

2012_04_02_1649_yaowu_bugfix_std-hd
2012_04_03_1452_yaowu_hump_std-hd
represent the encoding test results and std-hd set prior and after this
commit respectively.

Change-Id: Ie4313e317c737ea0e699c3a7919c1376744baa1a

--- a/vp8/encoder/firstpass.c

+++ b/vp8/encoder/firstpass.c

@@ -2648,8 +2648,7 @@

             && lookup_next_frame_stats(cpi, &next_frame) != EOF)

         {

             // Normal scene cut check

-            if ( ( i >= MIN_GF_INTERVAL ) &&

-                 test_candidate_kf(cpi, &last_frame, this_frame, &next_frame) )

+            if ( test_candidate_kf(cpi, &last_frame, this_frame, &next_frame) )

             {

                 break;

             }