[x264-devel] Worse PSNR with --subme 9 and --subme 11

[Raul Lopez]

I am trying to improve the PSNR quantitative video quality of x264 by
reducing or eliminating early terminations but I actually get worse PSNR
results:

default/--subme 7:
31.40 38.60 41.43

--subme 11
31.34 38.54 41.36

--subme 9
31.34 38.54 41.36

Is there anything else that I need to do to disable early terminations or
why would 9 and 11 be worse than 7?  I am already using --no-fast-pskip
(which makes picture not have subtle random blocks).

This is my command line:

x264
--input-res 1920x1080
--fps 60000/1001
--bitrate 2700
--vbv-maxrate 2700
--vbv-bufsize 8100
--nal-hrd cbr
--keyint 256
--output X_subme9.h264
--no-fast-pskip
--subme 9
--dump-yuv X_subme9.yuv
BQTerrace_1920x1080_60_H264.yuv

version is:
x264 0.138.x
(libswscale 2.3.100)
(libavformat 55.12.100)
built on Sep 17 2013, gcc: 4.2.1 (Based on Apple Inc. build 5658) (LLVM
build 2336.11.00)
configuration: --bit-depth=8 --chroma-format=all
x264 license: GPL version 2 or later
libswscale/libavformat license: GPL version 2 or later

Thanks for any leads.

RAUL
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