{
  "result": "PASS",
  "reviewedAt": "2026-11-15T00:18:48.314312+00:00",
  "actualGoogleSnapshotAccepted": true,
  "googleSnapshots": [
    "google-page1.json",
    "google-page2.json"
  ],
  "method": "Actual native Chrome Google ordinary9+first page2, hl=en gl=us pws=0; ad and AI Overview excluded; physicalUSIP unknown",
  "firstThreeReviewed": true,
  "originalTopTenRows": 10,
  "readableBodiesReviewed": 9,
  "unavailable": [
    {
      "rank": 6,
      "url": "https://www.reddit.com/r/Logic_Studio/comments/6txm8m/is_it_possible_to_convert_an_m4a_to_midi_file/",
      "http": "403",
      "checkedAt": "2026-11-14T23:58:28.165055+00:00",
      "status": "UNKNOWN_NOT_REPLACED"
    }
  ],
  "firstQuestion": "Can I convert an M4A directly, and does local WAV preparation fix codec decoding or note recovery?",
  "questionBasis": [
    {
      "rank": 1,
      "covered": "M4A-to-MIDI steps plus M4A-to-WAV workflow"
    },
    {
      "rank": 2,
      "covered": "No pre-format conversion required; source quality advice"
    },
    {
      "supplement": "https://audiotomidiconverter.com/m4a-to-midi",
      "covered": "Explicit direct-versus-WAV FAQ and codec/hash experiments already exist; cannot claim those absent"
    }
  ],
  "fixedRivals": [
    "jukeblocks.io",
    "openmusic.ai",
    "craftmusic.ai"
  ],
  "googleRanksSeparateFromFixedRivals": true,
  "qualityGapScope": "No annotation-relative matched/missed/extra or onset/duration-error table located in these9read original bodies; PureMIDI does give event counts and source/output examples, so do not claim competitors have no quantitative examples. Rank6 unknown.",
  "novelIncrementScope": "Fresh declared human-recording windows with explicit attack reference, duration error, missing/extra notes and native decoding/no-note distinctions; experiment claims limited to this tool and source batch, never competing tool quality or global uniqueness.",
  "priorMeasuredCompetitorCounterevidence": "Supplement already has7encoding/byte agreement/chord/bass failures; codec count, byte match and generic limitation not individually credited as unique substance. New specific human-reference findings may be credited.",
  "columns": [
    "输入格式",
    "输出格式",
    "质量或精度",
    "登录",
    "批量",
    "上限"
  ],
  "rows": [
    {
      "rank": 1,
      "url": "https://anyconv.com/m4a-to-midi-converter/",
      "checkedAt": "2026-11-14T23:58:26.548098+00:00",
      "http": "200",
      "textSHA256": "81f977747f9564399f50624d4050adbde60758d15d959e5ebfb63d46538ed9ce",
      "输入格式": "M4A",
      "输出格式": "MIDI",
      "质量或精度": "We do our best to preserve the original quality; result accurate and clean; no annotated matched/missed/extra counts",
      "登录": "without signing up or installing anything",
      "批量": "multiple M4A files at once",
      "上限": "Max file size100MB"
    },
    {
      "rank": 2,
      "url": "https://www.songscription.ai/audio-to-midi",
      "checkedAt": "2026-11-14T23:58:25.820774+00:00",
      "http": "200",
      "textSHA256": "dedc1ff99982ac6b67c06b6d0cb2784d3b8b54d517752abb1a0af2f030eefa54",
      "输入格式": "MP3,WAV,M4A,FLAC,AAC,OGG,WebM,MP4,MOV; links/recording/score also described",
      "输出格式": "MIDI for DAW; editable piano roll",
      "质量或精度": "Transcription mode captures exact notes; real examples shown, no annotated error counts",
      "登录": "未写明（免费30秒/长段trial；本页未写明是否必须登录）",
      "批量": "未写明",
      "上限": "free30-second clips; trial for longer"
    },
    {
      "rank": 3,
      "url": "https://conversiontab.com/audio-converter/m4a-midi",
      "checkedAt": "2026-11-14T23:58:27.113651+00:00",
      "http": "200",
      "textSHA256": "6be410f4411dd5dfd4e9f9097e54be7f15f922458cc7a3aeb68c51f6a3709922",
      "输入格式": "M4A",
      "输出格式": "MIDI",
      "质量或精度": "未写明（建议检查duration/channels/loudness，未给音符对错数）",
      "登录": "未写明",
      "批量": "未写明",
      "上限": "up to500MB"
    },
    {
      "rank": 4,
      "url": "https://nafy.ai/audio-to-midi",
      "checkedAt": "2026-11-14T23:58:28.233594+00:00",
      "http": "200",
      "textSHA256": "4364f5e666e023ad2a7c688fc4919c06a51263e26bde1cdc365f235bb060721e",
      "输入格式": "MP3,WAV,OGG,FLAC,M4A",
      "输出格式": "MID; editable MIDI editor",
      "质量或精度": "polyphonic recognition; solo/isolated clearer; no quantified annotated precision",
      "登录": "未写明",
      "批量": "未写明",
      "上限": "up to50MB"
    },
    {
      "rank": 5,
      "url": "https://musictomidi.com/",
      "checkedAt": "2026-11-14T23:58:27.844180+00:00",
      "http": "200",
      "textSHA256": "c5faabe295012b4911714e9480f98a11f0a358eaf0e62c9ad55db7b0972995ea",
      "输入格式": "MP3,WAV,FLAC,M4A,AAC,ALAC and listed audio/video formats",
      "输出格式": "MIDI; online models sheet music/tab",
      "质量或精度": "isolated clearer; full mix requires cleanup; no annotated error counts",
      "登录": "local model no account; server models require account",
      "批量": "未写明",
      "上限": "local model free without limit; per-file size未写明"
    },
    {
      "rank": 6,
      "url": "https://www.reddit.com/r/Logic_Studio/comments/6txm8m/is_it_possible_to_convert_an_m4a_to_midi_file/",
      "checkedAt": "2026-11-14T23:58:28.165055+00:00",
      "http": "403",
      "textSHA256": "388d5f0e22bd608061eb0cfbd7dcb2d4f1118ca177fea3fbffaddc652ac88623",
      "输入格式": "UNKNOWN_HTTP403",
      "输出格式": "UNKNOWN_HTTP403",
      "质量或精度": "UNKNOWN_HTTP403",
      "登录": "UNKNOWN_HTTP403",
      "批量": "UNKNOWN_HTTP403",
      "上限": "UNKNOWN_HTTP403"
    },
    {
      "rank": 7,
      "url": "https://craftmusic.ai/audio-to-midi-converter",
      "checkedAt": "2026-11-14T23:58:30.148510+00:00",
      "http": "200",
      "textSHA256": "b2b298d5e848b3a711a40ccfc8d4d5732e404f99e2f6b52db84ee87579075800",
      "输入格式": "MP3,WAV,OGG,M4A,AAC,FLAC,WMA",
      "输出格式": "standard.mid; MIDI editor",
      "质量或精度": "monophonic clearer than dense/reverberant/distorted mix; no annotated precision",
      "登录": "未写明（Log in导航不当作转换前提）",
      "批量": "未写明",
      "上限": "未写明"
    },
    {
      "rank": 8,
      "url": "https://audio-convert.com/m4a-converter/m4a-to-midi",
      "checkedAt": "2026-11-14T23:58:30.726817+00:00",
      "http": "200",
      "textSHA256": "2826018449a9319ef5c21f085d2cf1179cbe5e039f47b6ecaa81dcd24f269670",
      "输入格式": "M4A",
      "输出格式": "MID",
      "质量或精度": "未写明",
      "登录": "未写明",
      "批量": "select.m4a files; Download all",
      "上限": "未写明"
    },
    {
      "rank": 9,
      "url": "https://ai-midi.com/",
      "checkedAt": "2026-11-14T23:58:30.186277+00:00",
      "http": "200",
      "textSHA256": "a2903a2da9b65d1aa013c0306e961dc55d717c6166f557a6d959d91a51f9c733",
      "输入格式": "FLAC,MP3,OGG,WAV; videoMP4/MOV/AVI/MKV/WebM",
      "输出格式": "MIDI; preview then download",
      "质量或精度": "accuracy depends recording and arrangement; no measured error counts",
      "登录": "sign in to download; free weekly download after sign-in",
      "批量": "未写明",
      "上限": "free audio up to5min; video5min50MB; audio file size depends plan"
    },
    {
      "rank": 10,
      "url": "https://puremidi.com/",
      "checkedAt": "2026-11-14T23:58:30.320468+00:00",
      "http": "200",
      "textSHA256": "356dda198ac12e5478ee96f29d155585342ac26c9cce5f981b18300c0b9b22cd",
      "输入格式": "MP3,WAV,M4A,FLAC,OGG,WEBM,AAC; AIFF noted in body",
      "输出格式": "MID; score/MusicXML tools described",
      "质量或精度": "real output demos18notes/375notes; these are event counts, not annotated accuracy/error rates",
      "登录": "free preview with free account; full conversion credits",
      "批量": "未写明",
      "上限": "25.0MB; eligible audio preview up to30sec"
    }
  ],
  "sourceBodiesRetainedPrivatelyNotRedistributed": "../google-sources and ../google-public-sources.json; public report contains paraphrased actual values/source SHA, no copied rival prose."
}