{
 "id": "next-sun-sound",
 "name": "NeXT/Sun sound",
 "category": "audio",
 "identifiers": {
  "extensions": [
   "au",
   "snd"
  ],
  "mime": [
   "audio/basic"
  ],
  "puid": [
   "x-fmt/139"
  ],
  "wikidata": [
   "Q672985"
  ],
  "magic": [
   {
    "offset": 0,
    "hex": "2e736e64000000",
    "notes": "NeXT/Sun sound"
   },
   {
    "offset": 0,
    "hex": "2e736e64"
   }
  ],
  "signatures": [
   {
    "name": "NeXT/Sun sound",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "pattern": "2e736e64000000{5}000000(01|02|03|04|05|06|07|17|18|19|1a|1b){4}000000"
     }
    ]
   }
  ]
 },
 "status": "writable",
 "summary": "This is an outline record only, and requires further details, research or authentication to provide information that will enable users to further understand the format and to assess digital preservation risks associated with it if appropriate. If you are able to help by supplying any additional information concerning this entry, please return to the main PRONOM page and select ‘Add an Entry’.",
 "tools": [
  {
   "name": "FFmpeg",
   "url": "https://ffmpeg.org",
   "license": "LGPL-2.1-or-later / GPL-2.0-or-later",
   "open_source": true,
   "reads": true,
   "writes": true
  },
  {
   "name": "FFmpeg (WebAssembly)",
   "url": "https://github.com/ffmpegwasm/ffmpeg.wasm",
   "license": "GPL-2.0-or-later",
   "open_source": true,
   "reads": true,
   "writes": false
  },
  {
   "name": "ACD FotoCanvas Lite",
   "url": "https://www.wikidata.org/wiki/Q116994901",
   "reads": true,
   "writes": false
  },
  {
   "name": "ACDSee 5",
   "url": "https://www.wikidata.org/wiki/Q116957642",
   "reads": true,
   "writes": false
  },
  {
   "name": "Adobe After Effects",
   "url": "https://www.adobe.com/products/aftereffects",
   "reads": true,
   "writes": false,
   "license": "proprietary license"
  },
  {
   "name": "Apache Tika",
   "url": "https://tika.apache.org",
   "reads": true,
   "writes": false,
   "license": "Apache Software License 2.0",
   "open_source": true
  },
  {
   "name": "Awave Studio",
   "url": "https://www.fmjsoft.com/awavestudio.html#main",
   "reads": true,
   "writes": true
  },
  {
   "name": "CoffeeCup Software",
   "url": "https://www.wikidata.org/wiki/Q109284794",
   "reads": true,
   "writes": false
  },
  {
   "name": "IrfanView",
   "url": "https://www.irfanview.com/",
   "reads": true,
   "writes": false,
   "license": "freeware"
  },
  {
   "name": "libsndfile",
   "url": "https://libsndfile.github.io/libsndfile/",
   "reads": true,
   "writes": true,
   "license": "GNU Lesser General Public License",
   "open_source": true
  },
  {
   "name": "Mathematica",
   "url": "https://www.wolfram.com/mathematica/",
   "reads": false,
   "writes": true,
   "license": "proprietary license"
  },
  {
   "name": "Microsoft PowerPoint 2011",
   "url": "https://www.wikidata.org/wiki/Q28018630",
   "reads": true,
   "writes": false
  },
  {
   "name": "Microsoft PowerPoint 2013",
   "url": "https://www.wikidata.org/wiki/Q28018622",
   "reads": true,
   "writes": false
  },
  {
   "name": "Microsoft PowerPoint 2016",
   "url": "https://www.wikidata.org/wiki/Q28018608",
   "reads": true,
   "writes": false
  },
  {
   "name": "Music Creator",
   "url": "https://www.wikidata.org/wiki/Q118583348",
   "reads": true,
   "writes": false
  },
  {
   "name": "Music on Console",
   "url": "http://moc.daper.net/",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License",
   "open_source": true
  },
  {
   "name": "Netscape Navigator 4.05",
   "url": "https://www.wikidata.org/wiki/Q114266272",
   "reads": true,
   "writes": false
  },
  {
   "name": "PhotoRec",
   "url": "http://www.cgsecurity.org/wiki/PhotoRec",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License",
   "open_source": true
  },
  {
   "name": "Q191782",
   "url": "https://www.audacityteam.org/",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License, version 3.0",
   "open_source": true
  },
  {
   "name": "Q300915",
   "url": "https://www.foobar2000.org/",
   "reads": true,
   "writes": false,
   "license": "freeware"
  },
  {
   "name": "Q3898244",
   "url": "https://MediaArea.net/MediaInfo",
   "reads": true,
   "writes": false,
   "license": "BSD licenses / GNU General Public License / GNU Lesser General Public License",
   "open_source": true
  },
  {
   "name": "Snack Sound Toolkit",
   "url": "http://www.speech.kth.se/snack/",
   "reads": true,
   "writes": false
  },
  {
   "name": "Sound Forge XP 3.0",
   "url": "https://www.wikidata.org/wiki/Q116619109",
   "reads": true,
   "writes": true
  },
  {
   "name": "Sound Forge XP Studio",
   "url": "https://www.wikidata.org/wiki/Q113292059",
   "reads": true,
   "writes": true
  },
  {
   "name": "thousand tunes player",
   "url": "http://music.taihe.com/",
   "reads": true,
   "writes": false,
   "license": "proprietary license"
  },
  {
   "name": "VideoStudio X7",
   "url": "https://www.wikidata.org/wiki/Q113644652",
   "reads": true,
   "writes": false
  },
  {
   "name": "WebPlus Essentials",
   "url": "https://www.wikidata.org/wiki/Q109625259",
   "reads": true,
   "writes": false
  },
  {
   "name": "Windows Media Player, version 10",
   "url": "http://www.microsoft.com/windows/windowsmedia/player/10/default.aspx",
   "reads": true,
   "writes": false
  },
  {
   "name": "Windows Media Player, version 11",
   "url": "http://www.microsoft.com/windows/windowsmedia/player/11/default.aspx",
   "reads": true,
   "writes": false
  },
  {
   "name": "Windows Media Player, version 12",
   "url": "https://www.wikidata.org/wiki/Q28018460",
   "reads": true,
   "writes": false
  },
  {
   "name": "Windows Media Player, version 6.4",
   "url": "https://www.wikidata.org/wiki/Q139790984",
   "reads": true,
   "writes": false
  },
  {
   "name": "Windows Media Player, version 7",
   "url": "https://www.wikidata.org/wiki/Q139792281",
   "reads": true,
   "writes": false
  },
  {
   "name": "Windows Media Player, version 8",
   "url": "https://www.wikidata.org/wiki/Q139792269",
   "reads": true,
   "writes": false
  },
  {
   "name": "Windows Media Player, version 9",
   "url": "https://www.wikidata.org/wiki/Q28018572",
   "reads": true,
   "writes": false
  }
 ],
 "projects": [
  {
   "name": "File Formats Wiki",
   "url": "http://fileformats.archiveteam.org/wiki/AU",
   "kind": "wiki"
  },
  {
   "name": "Kaitai Struct: au",
   "url": "https://formats.kaitai.io/au/",
   "kind": "grammar",
   "license": "CC0-1.0"
  },
  {
   "name": "PRONOM x-fmt/139",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/x-fmt/139",
   "kind": "format-doc"
  },
  {
   "name": "Wikidata Q672985",
   "url": "https://www.wikidata.org/wiki/Q672985",
   "kind": "wiki"
  }
 ],
 "provenance": {
  "sources": [
   "converters",
   "engines",
   "ffw",
   "kaitai",
   "pronom",
   "wikidata"
  ]
 },
 "updated": "2026-10-25",
 "parsers": [
  {
   "engine": "kaitai",
   "url": "https://github.com/kaitai-io/kaitai_struct_formats/blob/master/media/au.ksy",
   "license": "CC0-1.0"
  }
 ],
 "conversions": [
  {
   "to": "flac-free-lossless-audio-codec-1-2-1",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.au out.flac",
   "fidelity": "lossless",
   "losses": "Lossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "waveform-audio",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.au out.wav",
   "fidelity": "lossless",
   "losses": "Lossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "mpeg-1-2-audio-layer-3",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.au out.mp3",
   "fidelity": "lossy",
   "losses": "Lossy re-encoding.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "ogg",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.au out.ogg",
   "fidelity": "lossy",
   "losses": "Lossy re-encoding.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "mpeg-4-part-14",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.au out.mp4",
   "fidelity": "lossy",
   "losses": "Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "matroska-1-4",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.au out.mkv",
   "fidelity": "lossy",
   "losses": "Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "webm",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.au out.webm",
   "fidelity": "lossy",
   "losses": "Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "mpeg-1-2-audio-layer-3",
   "tool": "FFmpeg (WebAssembly)",
   "command": "In the browser at https://openformatdb.org/convert/, or convert_file in the OpenFormatDB MCP server",
   "fidelity": "lossy",
   "losses": "Lossy re-encoding.",
   "url": "https://openformatdb.org/convert/",
   "engine": "ffmpeg"
  },
  {
   "to": "waveform-audio",
   "tool": "FFmpeg (WebAssembly)",
   "command": "In the browser at https://openformatdb.org/convert/, or convert_file in the OpenFormatDB MCP server",
   "fidelity": "lossless",
   "losses": "Lossless for decoded audio; a lossy source stays as degraded as it was.",
   "url": "https://openformatdb.org/convert/",
   "engine": "ffmpeg"
  },
  {
   "to": "flac-free-lossless-audio-codec-1-2-1",
   "tool": "FFmpeg (WebAssembly)",
   "command": "In the browser at https://openformatdb.org/convert/, or convert_file in the OpenFormatDB MCP server",
   "fidelity": "lossless",
   "losses": "Lossless for decoded audio; a lossy source stays as degraded as it was.",
   "url": "https://openformatdb.org/convert/",
   "engine": "ffmpeg"
  },
  {
   "to": "ogg",
   "tool": "FFmpeg (WebAssembly)",
   "command": "In the browser at https://openformatdb.org/convert/, or convert_file in the OpenFormatDB MCP server",
   "fidelity": "lossy",
   "losses": "Lossy re-encoding.",
   "url": "https://openformatdb.org/convert/",
   "engine": "ffmpeg"
  },
  {
   "to": "ogg-opus-codec-compressed-multimedia-file",
   "tool": "FFmpeg (WebAssembly)",
   "command": "In the browser at https://openformatdb.org/convert/, or convert_file in the OpenFormatDB MCP server",
   "fidelity": "lossy",
   "losses": "Lossy re-encoding.",
   "url": "https://openformatdb.org/convert/",
   "engine": "ffmpeg"
  },
  {
   "to": "advanced-audio-coding",
   "tool": "FFmpeg (WebAssembly)",
   "command": "In the browser at https://openformatdb.org/convert/, or convert_file in the OpenFormatDB MCP server",
   "fidelity": "lossy",
   "losses": "Lossy re-encoding.",
   "url": "https://openformatdb.org/convert/",
   "engine": "ffmpeg"
  }
 ],
 "aliases": [],
 "structure": [],
 "samples": [],
 "claims": [],
 "verification": []
}