{
  "date": "2026-09-30",
  "input": "C:\\Users\\admin\\Documents\\Codex\\2026-09-17\\x20-4\\mp3-to-midi-site\\ops\\research\\change-mp3-to-midi-2026-09-24\\melody-192k.mp3",
  "inputSha256": "d8d525f87cc7dda8a062ba6b297e153e1f5886de7594f7f35c86026d7fc30c09",
  "inputDescription": "A 192 kbit/s mono MP3 encoded from the existing 2.40-second, 44.1 kHz synthetic sine melody; source pitches 60, 64, 67, 72; onsets 0.00, 0.60, 1.20, 1.80 s; durations 0.45 s.",
  "decoder": "FFmpeg 20181217-f22fcd4 to mono 44.1 kHz float PCM",
  "sourceNotes": [
    {
      "pitch": 60,
      "start": 0,
      "end": 0.45
    },
    {
      "pitch": 64,
      "start": 0.6,
      "end": 1.05
    },
    {
      "pitch": 67,
      "start": 1.2,
      "end": 1.65
    },
    {
      "pitch": 72,
      "start": 1.8,
      "end": 2.25
    }
  ],
  "siteDetector": {
    "source": "Unmodified functions extracted from dist/script.js",
    "mode": "Balanced (2)",
    "sampleRateAfterDownsample": 11025,
    "notes": [
      {
        "pitch": 60,
        "start": 0,
        "duration": 0.464
      },
      {
        "pitch": 64,
        "start": 0.464,
        "duration": 0.604
      },
      {
        "pitch": 67,
        "start": 1.068,
        "duration": 0.557
      },
      {
        "pitch": 72,
        "start": 1.672,
        "duration": 0.511
      }
    ]
  },
  "basicPitch": {
    "package": "@spotify/basic-pitch",
    "version": "1.0.1",
    "backend": "cpu",
    "inputRateHz": 22050,
    "method": "official model and default public inference functions",
    "notes": [
      {
        "pitch": 72,
        "start": 1.811,
        "duration": 0.454
      },
      {
        "pitch": 67,
        "start": 1.196,
        "duration": 0.476
      },
      {
        "pitch": 67,
        "start": 1.045,
        "duration": 0.151
      },
      {
        "pitch": 64,
        "start": 0.604,
        "duration": 0.464
      },
      {
        "pitch": 60,
        "start": 0,
        "duration": 0.476
      }
    ]
  },
  "limitations": [
    "One deliberately simple synthetic sine melody; not a recorded song or broad accuracy benchmark.",
    "Site detector test invokes its code functions after FFmpeg decode; it does not measure its browser picker/AudioContext path.",
    "Basic Pitch input was averaged from the same decoded 44.1 kHz PCM to 22.05 kHz; the input was not uploaded to a third party.",
    "A difference in note count or timing on this fixture does not prove general superiority."
  ]
}