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{
  "commit": "33b6de7cfe8118f7dcd9eb9a7dbb89090dc7b9fa",
  "tree": "22e1cf6bdcb714c9ccc5ea106baaf3c9eeaadca4",
  "parents": [
    "7e1dfee837f0cb717badf5e76bd48a23155b6bd9"
  ],
  "author": {
    "name": "Rachel Barker",
    "email": "rachelbarker@google.com",
    "time": "Fri Nov 03 04:09:59 2023 +0000"
  },
  "committer": {
    "name": "Rachel Barker",
    "email": "rachelbarker@google.com",
    "time": "Wed Nov 08 00:59:08 2023 +0000"
  },
  "message": "Use SAD for global motion error metric\n\nReplace custom error metric (sum of |diff|^0.7) with SAD.\nThis has three advantages:\n1) Better results\n2) SAD is faster to calculate\n3) We can remove ~1300 lines of code dedicated to the custom error\n   metric\n\nNote: Despite point (2), the overall runtime is increased slightly.\nThis is expected - improving the accuracy of global motion leads to it\nbeing evaluated more often, and this outweighs the time savings from\nspeeding up the error metric evaluations. But overall this significantly\nimproves the gain : encode time cost ratio of global motion.\n\nImpact on \"good\" mode:\n\n Speed | BDRATE-PSNR | BDRATE-SSIM |   Enc time\n-------+-------------+-------------+-------------\n   1   |   -0.087%   |   -0.102%   |   +0.085%\n   2   |   -0.075%   |   -0.074%   |   +0.331%\n   3   |   -0.111%   |   -0.122%   |   +0.445%\n   4   |   -0.110%   |   -0.118%   |   +0.598%\n\nOther modes, and good mode speed 5+, are unaffected.\n\nSTATS_CHANGED\n\nChange-Id: Ifdc52c5012d6936a97a87cff489062402e81e495\n",
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