)]}'
{
  "commit": "cdd4eb02915ee41554b8ba0e77e6bc0aca7ed978",
  "tree": "81d147796f4e1d117ad1817839729d2aec9a20c1",
  "parents": [
    "445274d9626853444a945ff423bded54178ea58a"
  ],
  "author": {
    "name": "Zoe Liu",
    "email": "zoeliu@google.com",
    "time": "Wed Jul 27 17:24:42 2016 -0700"
  },
  "committer": {
    "name": "Zoe Liu",
    "email": "zoeliu@google.com",
    "time": "Thu Aug 11 09:47:46 2016 -0700"
  },
  "message": "Fix a bug in RATE_FACTOR_LEVEL definition for ext-refs\n\nThere was a bug in the original set up for RATE_FACTOR_LEVELS, which\nresults that rate_factor_deltas for GF_ARF_STD is 2.00, instead of the\nintentional value of 1.75, whereas for KF_STD is 0.00, instead of the\nintentional value of 2.00.\n\nNevertheless, if simply fixing the bug as in the first patch, the RD\nperformance unexpectedly dropped by 0.143% in Avg bitrate using\nOverall PSNR, especially for following sequences in lowres:\n\nbridge_close_cif: dropped by 1.468%\ncontainer_cif: dropped by 2.140%\nhusky_cif: dropped by 0.826%\nmotherdaughter_cif: dropped by 0.798%\nrasehorses_240p: dropped by 0.805%\nstudents_cif: dropped by 1.411%\n\nThis indicates that we should boost up the value for GF_ARF_STD from\n1.75 to at least to 2.00. After doing so, while still keeps 2.00 for\nKF_STD, the new patch achieves a small gain of 0.15% for the baseline,\nand a smaller gain of 0.06% for the experiment of ext-refs. Most\nsequences keep the similar RD performance in lowres, except for the\nfollowing ones that obtain a bigger gain:\n\n(1) Baseline:\ncontainer_cif: 1.628%\nstudents_cif: 1.015%\n\n(2) ext-refs\ntennis_sif: 1.248%\n\nChange-Id: I992f8f6a3e20f1b71ec52a1ddc969af4968b78d5\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "a514a0e9be4d2e1cf735b805ba1737a8b7a755b9",
      "old_mode": 33188,
      "old_path": "vp10/encoder/ratectrl.c",
      "new_id": "c35b7ce665cc3a428cae086cb0adb19f394c9972",
      "new_mode": 33188,
      "new_path": "vp10/encoder/ratectrl.c"
    },
    {
      "type": "modify",
      "old_id": "f70429bedc9c42ffcb64ece183f12348c9617d04",
      "old_mode": 33188,
      "old_path": "vp10/encoder/ratectrl.h",
      "new_id": "520dbeb9c8b9422c4a3986c22d2ce8da1e4a4266",
      "new_mode": 33188,
      "new_path": "vp10/encoder/ratectrl.h"
    }
  ]
}