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    • 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
  32. 28 Aug, 2004 2 commits
  33. 17 Aug, 2004 1 commit
  34. 08 Aug, 2004 1 commit
    • Laurent Aimar's avatar
      * all: Change the way PSNR is computed (based on a patch by Loren · 11e1b0c2
      Laurent Aimar authored
      Merritt <lorenmn AT u DOT washington DOT edu>
       Using SQE(DeltaSourceReconstructed) = Sum( delta^2 )
             PSNR( SQE, Size ) = -10Ln(SQE / 255^2 / Size )/Ln(10) )
             Y+U+V : Union of YUV planes.
      
       Now there is 
        - Mean PSNR : Sum( PSNR( SQE(Y/U/V), Size(Y/U/V) ) / TotalFrames
        - Average PSNR: Sum( PSNR( SQE(Y+U+V), Size(Y+U+V) ) ) / TotalFrames
        - Global PSNR: PSNR( Sum( SQE(Y+U+V) ), Size(Y+U+V)*TotalFrames )
      
        Mean PSNR is used by the JM, and Average/Overall is used on Doom9 for
      example.
      
      
      
      git-svn-id: svn://svn.videolan.org/x264/trunk@19 df754926-b1dd-0310-bc7b-ec298dee348c
      11e1b0c2
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