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  29. 29 Sep, 2004 2 commits
    • Laurent Aimar's avatar
      * ratecontrol: Patch by Loren Merritt : · 48937c64
      Laurent Aimar authored 
      " This patch
* calculates average QP as a float, providing slightly improved
ratecontrol if the first pass was CBR.
* fixes the reported QP if you set both b_stat_read and b_stat_write,
allowing 3 pass encoding (or just examination of the 2nd pass's stats)."



git-svn-id: svn://svn.videolan.org/x264/trunk@50 df754926-b1dd-0310-bc7b-ec298dee348c
      48937c64
    • Laurent Aimar's avatar
      * all: Patch by Loren Merritt. · e3ae8a7d
      Laurent Aimar authored 
      " This patch makes scene-cut detection based on the relative cost of I-frame
vs P-frame, rather than just on the number of I-blocks used.
It also makes the scene-cut threshold configurable.

This doesn't have a very large effect: Most scene cuts are obvious to
either algorithm. But I think this way is better in some less clear cut
cases, and sometimes finds a better spot for an I-frame than just waiting
for the max I-frame interval."



git-svn-id: svn://svn.videolan.org/x264/trunk@49 df754926-b1dd-0310-bc7b-ec298dee348c
      e3ae8a7d
  31. 22 Sep, 2004 2 commits
    • Laurent Aimar's avatar
      * ratecontrol: added 'b' flag to fopen. · 79a2bb78
      Laurent Aimar authored 
      
git-svn-id: svn://svn.videolan.org/x264/trunk@48 df754926-b1dd-0310-bc7b-ec298dee348c
      79a2bb78
    • Laurent Aimar's avatar
      * all: Patches by Loren Merritt: · 48e28864
      Laurent Aimar authored 
      "Improved patch. Now supports subpel ME on all candidate MB types,
not just on the winner.

subpel_refine: (completely different scale from before)
0 => halfpel only
1 => 1 iteration of qpel on the winner (same as x264 r46)
2 => 2 iterations of qpel (about the same as my earlier patch, but faster
3 => halfpel on all MB types, qpel on the winner
4 => qpel on all
5 => more iterations

benchmarks:
mencoder dvd://1 -ovc x264 -x264encopts
qp_constant=19:fullinter:cabac:iframe=200:psnr

subpel_refine=1:  PSNR Global:46.82 kb/s:1048.1 fps:17.335
subpel_refine=2:  PSNR Global:46.83 kb/s:1034.4 fps:16.970
subpel_refine=3:  PSNR Global:46.84 kb/s:1023.3 fps:14.770
subpel_refine=4:  PSNR Global:46.87 kb/s:1010.8 fps:11.598
subpel_refine=5:  PSNR Global:46.88 kb/s:1006.9 fps:10.824"

 And

"The current code for calculating the cost of encoding which reference
frame a MB is predicted from, introduces a bias towards ref0 and
against P16x16.
Removing this bias produces an improvement of .4% - 2% bitrate,
depending on content and number of reference frames."



git-svn-id: svn://svn.videolan.org/x264/trunk@47 df754926-b1dd-0310-bc7b-ec298dee348c
      48e28864
  33. 29 Aug, 2004 2 commits
  35. 28 Aug, 2004 6 commits
  37. 22 Aug, 2004 1 commit
  39. 18 Aug, 2004 1 commit
  41. 17 Aug, 2004 5 commits
  43. 16 Aug, 2004 2 commits
  45. 13 Aug, 2004 2 commits

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