Nullsoft Streaming Video
Readablevideo
The Nullsoft Streaming Video (NSV) format is a multimedia container format designed to enable streaming of video and audio.
Identify it
| Extensions | .nsv |
|---|---|
| MIME types | application/x-winamp |
| Signatures | 4e535666 at byte 0 (Nullsoft Video with optional header)4e535673 at byte 0 (Nullsoft Video without optional header)4e5356 at byte 0 |
| PRONOM | fmt/1176 |
| Wikidata | Q7069009 |
| Library of Congress | fdd000608 |
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Open it
Convert it
| To | With | Fidelity | Command and losses |
|---|---|---|---|
| FLAC (Free Lossless Audio Codec) 1.2.1 | FFmpeg | Partial | ffmpeg -i in.nsv out.flacAudio track only: the video is dropped. |
| Waveform Audio | FFmpeg | Partial | ffmpeg -i in.nsv out.wavAudio track only: the video is dropped. |
| Matroska 1-4 | FFmpeg | Lossy | ffmpeg -i in.nsv out.mkvRe-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
| MPEG 1/2 Audio Layer 3 | FFmpeg | Lossy | ffmpeg -i in.nsv out.mp3Lossy audio only: the video is dropped. |
| MPEG-4 Part 14 | FFmpeg | Lossy | ffmpeg -i in.nsv out.mp4Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
| Ogg | FFmpeg | Lossy | ffmpeg -i in.nsv out.oggLossy audio only: the video is dropped. |
| WebM | FFmpeg | Lossy | ffmpeg -i in.nsv out.webmRe-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
Sources
From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), PRONOM, Wikidata. Updated 2026-10-20.