• 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
    mencoder dvd://1 -ovc x264 -x264encopts
    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"
    "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