VMAF 2.3.0 : the score output by the terminal is inconsistent with the score in the output file

[Roly Yu]

When the parameter contains --subsample, the vmaf score output by the terminal is inconsistent with the score in the output file

❯ ./vmaf
--reference ref.yuv
--distorted dis.yuv
--width 1920 --height 1080 --pixel_format 420 --bitdepth 8
--model version=vmaf_v0.6.1
--threads 4
--subsample 10
--json --output output.json
VMAF version 5c1c9bf
75 frames ⠉⠙ 34.85 FPS
vmaf_v0.6.1: 94.423696

These data are extracted from the attached file. If you calculate the mean of each frame score, it is consistent with the terminal output. However, the vmaf mean in the output file is abnormal.

    "vmaf": 79.544828
    "vmaf": 100.000000
    "vmaf": 99.517673
    "vmaf": 100.000000
    "vmaf": 91.859050
    "vmaf": 95.592886
    "vmaf": 91.290891
    "vmaf": 97.584242

"vmaf": {
  "min": 79.544828,
  "max": 79.544828,
  "mean": 79.544828,
  "harmonic_mean": 79.544828
}

output.txt

[Nil Fons Miret]

Thanks @rolyyu for bringing this issue to our attention, it was a bug in the way parameters were passed to the output_json and output_xml functions when subsampling was present. This was fixed by #1135 so I'm closing it, feel free to reopen if there are more problems.