[x264-devel] on psy_rd

[Matyas]

Hi,

Could someone in the know compare and comment the two runs bellow.  It would
hopefully help me understand the usage/benefit of various psy_rd values.

Run A:

x264 - core 68 r1189 9d0b5e9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2009 -
http://www.videolan.org/x264.html - options: cabac=1 ref=4 deblock=1:0:0
analyse=0x3:0x133 me=umh subme=6 psy_rd=0.5:0.2 mixed_ref=1 me_range=32
chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 chroma_qp_offset=-3
threads=3 nr=0 decimate=0 mbaff=0 bframes=9 b_pyramid=1 b_adapt=1 b_bias=0
direct=3 wpredb=1 keyint=300 keyint_min=25 scenecut=40 rc=crf crf=22.0
qcomp=0.70 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.40 pb_ratio=1.30 aq=2:1.00

x264 [info]: SSIM Mean Y:0.9840352
x264 [info]: PSNR Mean Y:44.007 U:45.326 V:48.183 Avg:44.647 Global:43.967
kb/s:531.89

run B:

x264 - core 68 r1189 9d0b5e9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2009 -
http://www.videolan.org/x264.html - options: cabac=1 ref=4 deblock=1:0:0
analyse=0x3:0x133 me=umh subme=6 psy_rd=0.0:0.2 mixed_ref=1 me_range=32
chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 chroma_qp_offset=-1
threads=3 nr=0 decimate=0 mbaff=0 bframes=9 b_pyramid=1 b_adapt=1 b_bias=0
direct=3 wpredb=1 keyint=300 keyint_min=25 scenecut=40 rc=crf crf=22.0
qcomp=0.70 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.40 pb_ratio=1.30 aq=2:1.00

x264 [info]: SSIM Mean Y:0.9841399
x264 [info]: PSNR Mean Y:44.013 U:44.822 V:47.703 Avg:44.535 Global:43.821
kb/s:466.48

The source was 10 minutes long (a sample from a progressive DVD).
Thanks.
Matyas