{
  "schemaVersion": 1,
  "preparedOn": "2026-09-30",
  "generator": "tools/prepare-frog-elephant.mjs",
  "records": [
    {
      "id": "frog",
      "title": "Calyptocephalella gayi — iNaturalist observation 140382019, sound 556118",
      "species": "Calyptocephalella gayi",
      "author": "Fabian EGL",
      "recordingDate": "2022-10-09",
      "recordingLocation": "Curicó, Región del Maule, Chile",
      "locationAsPublished": "Curicó, CL-ML, CL",
      "recordingDescription": "En estanque al lado del camino.",
      "sourcePage": "https://www.inaturalist.org/observations/140382019",
      "metadataUrl": "https://api.inaturalist.org/v1/observations/140382019",
      "originalUrl": "https://static.inaturalist.org/sounds/556118.mp3?1667054329",
      "originalFile": "fabian-egl-calyptocephalella-gayi-original.mp3",
      "metadataFile": "frog-inaturalist-140382019.json",
      "license": "CC0 1.0",
      "licenseUrl": "https://creativecommons.org/publicdomain/zero/1.0/",
      "licenseEvidence": "The per-sound license_code is cc0; attribution is no rights reserved. This is the audio license, not the observation or photo license.",
      "identificationEvidence": "Community taxon 65148 and observation taxon both Calyptocephalella gayi; quality_grade research; three current matching identifications in the saved API response.",
      "attribution": "Rana chilena (Calyptocephalella gayi), grabación de Fabian EGL, Curicó, Chile, 9 de octubre de 2022. iNaturalist 140382019 / sonido 556118. CC0 1.0. Adaptación: conversión a mono, ajuste de nivel, fundidos y repetición con silencios.",
      "output": "fauna-frog-chilena.wav",
      "ffmpegFilter": "aformat=channel_layouts=mono,alimiter=limit=0.065:attack=5:release=80:level=false:latency=true",
      "targetRms": 0.035,
      "durationSeconds": 32,
      "placementsSeconds": [
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        9,
        17,
        25
      ],
      "fadeSeconds": 0.4,
      "scope": "Recording from Curicó, not from Tagua Tagua. Species identification is supported by iNaturalist community metadata; no independent expert auditory identification is claimed. Repetitions are an edited ambience, not one continuous field recording. A lookahead limiter reduces isolated peaks; see the explicit filter parameters.",
      "original": {
        "path": "audio-sources/frog-elephant/fabian-egl-calyptocephalella-gayi-original.mp3",
        "bytes": 177066,
        "sha256": "33f00bd569520f21368c765937c6ee4e87378a7ba7bd8da0023e6c65c350e203",
        "decodedDurationSeconds": 6.016009070294785,
        "decodedMetrics": {
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          "dcOffset": -1.674534426427278e-7,
          "zeroFrames": 4416
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      "derivative": {
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        "format": "PCM_S16LE",
        "channels": 1,
        "sampleRate": 22050,
        "bitsPerSample": 16,
        "durationSeconds": 32,
        "bytes": 1411244,
        "sha256": "64a0b7f83a1192920b7871f3fa95bb2d21ba0aedcf1bf7b275b17366690a839d",
        "metrics": {
          "peak": 0.395477294921875,
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        "linearGain": 6.066172172656821,
        "fadeCurve": "squared-sine",
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        "placementsSeconds": [
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      "modifications": "Original audio extracted and downmixed to mono at 22050 Hz; DC offset removed; squared-sine fades applied to every excerpt; repeated at the documented positions with genuine digital silence between excerpts; normalized as a whole; PCM16 encoded. No pitch shift, time stretching, or synthetic animal call. Lookahead peak limiting before normalization: aformat=channel_layouts=mono,alimiter=limit=0.065:attack=5:release=80:level=false:latency=true."
    },
    {
      "id": "elephant",
      "title": "African elephant (Loxodonta africana) rumbling",
      "species": "Loxodonta africana",
      "author": "Kent Wang",
      "recordingDate": "2016-01-04",
      "recordingLocation": "Kruger National Park, South Africa",
      "sourcePage": "https://commons.wikimedia.org/wiki/File:African_elephant_(Loxodonta_africana)_rumbling.webm",
      "creatorSourcePage": "https://www.flickr.com/photos/kentwang/24071177271/",
      "metadataUrl": "https://commons.wikimedia.org/w/api.php?action=query&format=json&prop=imageinfo&iiprop=url%7Cextmetadata%7Csize%7Csha1&titles=File%3AAfrican_elephant_(Loxodonta_africana)_rumbling.webm",
      "originalUrl": "https://upload.wikimedia.org/wikipedia/commons/5/5e/African_elephant_%28Loxodonta_africana%29_rumbling.webm",
      "originalFile": "kent-wang-african-elephant-rumbling-original.webm",
      "metadataFile": "elephant-commons-metadata.json",
      "expectedOriginalSha1": "4a6e6d3cd649ac6266d0093b5e09aed2f219da08",
      "license": "CC BY-SA 2.0",
      "licenseUrl": "https://creativecommons.org/licenses/by-sa/2.0/",
      "derivativeLicense": "CC BY-SA 2.0",
      "derivativeLicenseUrl": "https://creativecommons.org/licenses/by-sa/2.0/",
      "licenseEvidence": "Commons per-file LicenseShortName CC BY-SA 2.0; attribution required; Flickr license reviewed by Pokéfan95 on 2016-01-24.",
      "identificationEvidence": "Creator-attributed Commons description identifies Loxodonta africana rumbling in Kruger National Park. Neither age nor juvenile status is supplied.",
      "attribution": "African elephant (Loxodonta africana) rumbling — Kent Wang, Kruger National Park, Sudáfrica, 4 de enero de 2016. Wikimedia Commons / Flickr. CC BY-SA 2.0. Adaptación: extracción del audio, conversión a mono, ajuste de nivel, fundidos y repetición con silencios. El derivado se distribuye bajo CC BY-SA 2.0.",
      "output": "anima-elephant-rumble.wav",
      "targetRms": 0.028,
      "durationSeconds": 32,
      "placementsSeconds": [
        2,
        19
      ],
      "fadeSeconds": 0.8,
      "scope": "Artistic elephant-derived presence for Ánima. Not an authentic gomphothere vocalization, not a Chilean fauna recording, and not identified as a calf. No pitch shift or time stretching.",
      "original": {
        "path": "audio-sources/frog-elephant/kent-wang-african-elephant-rumbling-original.webm",
        "bytes": 4964071,
        "sha256": "f80b4d7fe2611a524acb513d3cfa3480bd4f310ed7b3d6e12778d921c9b5a093",
        "decodedDurationSeconds": 9.03111111111111,
        "decodedMetrics": {
          "peak": 0.5453407168388367,
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          "dcOffset": -0.00035602490849239175,
          "zeroFrames": 784
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      },
      "derivative": {
        "path": "assets/audio/anima-elephant-rumble.wav",
        "format": "PCM_S16LE",
        "channels": 1,
        "sampleRate": 22050,
        "bitsPerSample": 16,
        "durationSeconds": 32,
        "bytes": 1411244,
        "sha256": "9ec1886b4fdc75f71d32aae7e59397b5091ba3228c78040a68f18b86983e16c5",
        "metrics": {
          "peak": 0.26715087890625,
          "rms": 0.027999154459316944,
          "dcOffset": -0.0000011663804519203516,
          "zeroFrames": 313584
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        "linearGain": 0.4895946141210903,
        "fadeCurve": "squared-sine",
        "fadeSeconds": 0.8,
        "placementsSeconds": [
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        ]
      },
      "modifications": "Original audio extracted and downmixed to mono at 22050 Hz; DC offset removed; squared-sine fades applied to every excerpt; repeated at the documented positions with genuine digital silence between excerpts; normalized as a whole; PCM16 encoded. No pitch shift, time stretching, or synthetic animal call."
    }
  ],
  "excludedCandidates": [
    {
      "sourcePage": "https://soundcloud.com/anfibios-de-chile/calyptocephalella-gayi",
      "author": "Felipe Rabanal",
      "recordingLocation": "Las Ánimas wetland, Valdivia, Chile",
      "recordingDate": "2010-04-06",
      "decision": "Excluded; public source says License: all-rights-reserved. No audio was downloaded."
    },
    {
      "sourcePage": "https://www.ranitadedarwin.org/cantos",
      "author": "José Manuel Serrano",
      "species": "Calyptocephalella gayi",
      "decision": "Excluded; no reusable per-recording license or recording locality was supplied on the inspected page. No audio was downloaded."
    }
  ],
  "claimRecord": {
    "support": "Saved primary per-file metadata, unmodified original downloads and their checksums support attribution, recording location and license; deterministic PCM analysis supports the stated levels and timing.",
    "changesAfterInspection": "Diagnostic-triggered adjustment: the frog arrangement normalized to RMS 0.035 initially peaked at 0.581754, so a lookahead limiter was added before normalization using the filter recorded on that asset. Original recordings, species, excerpt placements and fade durations were not changed. No taxon substitution.",
    "unresolved": "No human audition, physical device listening test, acoustic realism validation, or independent expert species identification was performed. These assets need integration-level mixer and playback checks by the host.",
    "decision": "User authorized recorded Chilean fauna and an elephant-derived artistic analogue. Museum interaction and narration controls are outside this task and untouched."
  }
}