View Single Post
Old 8th November 2005, 05:58   #56  |  Link
Audionut
Registered User
 
Join Date: Nov 2003
Posts: 1,281
I just tried another encode, ensuring low quants.
And Chroma-qp-offset made an impact on PSNR.


Pass1.
Code:
C:\Program Files\x264>x264.exe --pass 1 --bitrate 2000 --stats "F:\2pass.log" --bframes 2
--b-pyramid --weightb --analyse p8x8,b8x8,i4x4 --chroma-qp-offset 12 --threads 2 --progress --frames 2000 --output NUL
"F:\test.avs"


avis [info]: 704x288 @ 25.00 fps (7063 frames)
x264 [info]: using cpu capabilities MMX MMXEXT SSE SSE2
x264 [info]: slice I:47    Avg QP:15.06  size: 23452  PSNR Mean Y:49.06 U:45.86 V:46.75 Avg:47.88 Global:47.48
x264 [info]: slice P:1225  Avg QP:17.51  size: 12292  PSNR Mean Y:46.29 U:44.57 V:45.45 Avg:45.78 Global:45.47
x264 [info]: slice B:728   Avg QP:18.87  size:  5991  PSNR Mean Y:45.13 U:44.46 V:45.02 Avg:44.95 Global:44.54
x264 [info]: mb I  I16..4: 17.3%  0.0% 82.7%
x264 [info]: mb P  I16..4: 11.3%  0.0% 26.5%  P16..4: 24.1% 21.2% 11.2%  0.0%  0.0%    skip: 5.7%
x264 [info]: mb B  I16..4:  2.4%  0.0%  5.3%  B16..8: 50.1%  5.0% 10.9%  direct: 5.9%  skip:20.3%
x264 [info]: PSNR Mean Y:45.930 U:44.562 V:45.326 Avg:45.529 Global:45.139 kb/s: 2052.16

encoded 2000 frames, 18.22 fps, 2053.30 kb/s
Pass2.
Code:
C:\Program Files\x264>x264.exe --pass 2 --bitrate 2000 --stats "F:\2pass.log" --bframes 2
--b-pyramid --weightb --analyse p8x8,b8x8,i4x4 --chroma-qp-offset 12 --threads 2 --progress --frames 2000
--output "f:\test1.mkv" "F:\test.avs"


avis [info]: 704x288 @ 25.00 fps (7063 frames)
x264 [info]: using cpu capabilities MMX MMXEXT SSE SSE2
x264 [info]: slice I:47    Avg QP:15.66  size: 21978  PSNR Mean Y:48.69 U:45.71 V:46.50 Avg:47.61 Global:47.37
x264 [info]: slice P:1225  Avg QP:17.49  size: 12149  PSNR Mean Y:46.29 U:44.60 V:45.46 Avg:45.80 Global:45.59
x264 [info]: slice B:728   Avg QP:18.97  size:  5666  PSNR Mean Y:45.08 U:44.40 V:44.88 Avg:44.90 Global:44.66
x264 [info]: mb I  I16..4: 18.2%  0.0% 81.8%
x264 [info]: mb P  I16..4: 11.6%  0.0% 25.7%  P16..4: 25.2% 21.2% 10.4%  0.0%  0.0%    skip: 6.1%
x264 [info]: mb B  I16..4:  2.2%  0.0%  5.4%  B16..8: 50.4%  3.8%  8.3%  direct: 6.8%  skip:23.2%
x264 [info]: PSNR Mean Y:45.905 U:44.553 V:45.271 Avg:45.513 Global:45.263 kb/s: 2004.07

encoded 2000 frames, 20.34 fps, 2005.21 kb/s
__________________
http://www.7-zip.org/
Audionut is offline   Reply With Quote