{
 "id": "nullsoft-streaming-video",
 "name": "Nullsoft Streaming Video",
 "category": "video",
 "identifiers": {
  "extensions": [
   "nsv"
  ],
  "mime": [
   "application/x-winamp"
  ],
  "puid": [
   "fmt/1176"
  ],
  "wikidata": [
   "Q7069009"
  ],
  "loc_fdd": [
   "fdd000608"
  ],
  "magic": [
   {
    "offset": 0,
    "hex": "4e535666",
    "notes": "Nullsoft Video with optional header"
   },
   {
    "offset": 0,
    "hex": "4e535673",
    "notes": "Nullsoft Video without optional header"
   },
   {
    "offset": 0,
    "hex": "4e5356"
   }
  ],
  "signatures": [
   {
    "name": "Nullsoft Video with optional header",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "pattern": "4e535666{24-16384}4e535673"
     }
    ]
   },
   {
    "name": "Nullsoft Video without optional header",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "pattern": "4e535673"
     }
    ]
   }
  ],
  "priority_over": [
   "fmt/134"
  ]
 },
 "status": "readable",
 "summary": "The Nullsoft Streaming Video (NSV) format is a multimedia container format designed to enable streaming of video and audio.",
 "tools": [
  {
   "name": "FFmpeg",
   "url": "https://ffmpeg.org",
   "license": "LGPL-2.1-or-later / GPL-2.0-or-later",
   "open_source": true,
   "reads": true,
   "writes": false
  },
  {
   "name": "Q193493",
   "url": "https://winamp.com/",
   "reads": true,
   "writes": false,
   "license": "proprietary license"
  },
  {
   "name": "Q2596578",
   "url": "https://www.smplayer.info/",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License, version 2.0",
   "open_source": true
  }
 ],
 "projects": [
  {
   "name": "PRONOM fmt/1176",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/fmt/1176",
   "kind": "format-doc"
  },
  {
   "name": "Wikidata Q7069009",
   "url": "https://www.wikidata.org/wiki/Q7069009",
   "kind": "wiki"
  }
 ],
 "provenance": {
  "sources": [
   "converters",
   "pronom",
   "wikidata"
  ]
 },
 "updated": "2026-10-20",
 "conversions": [
  {
   "to": "flac-free-lossless-audio-codec-1-2-1",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.nsv out.flac",
   "fidelity": "partial",
   "losses": "Audio track only: the video is dropped.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "waveform-audio",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.nsv out.wav",
   "fidelity": "partial",
   "losses": "Audio track only: the video is dropped.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "mpeg-1-2-audio-layer-3",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.nsv out.mp3",
   "fidelity": "lossy",
   "losses": "Lossy audio only: the video is dropped.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "ogg",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.nsv out.ogg",
   "fidelity": "lossy",
   "losses": "Lossy audio only: the video is dropped.",
   "url": "https://ffmpeg.org"
  },
  {
   "to": "mpeg-4-part-14",
   "tool": "FFmpeg",
   "command": "ffmpeg -i in.nsv 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.nsv 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.nsv 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"
  }
 ],
 "aliases": [],
 "structure": [],
 "parsers": [],
 "samples": [],
 "claims": [],
 "verification": []
}