NUT Open Container Format

Writable

other

NUT is a container format for the storage of audio, video, subtitles and other related user defined streams. It provides an exact timestamp for synchronization and seeking.

Identify it

Extensions	`.nut`
MIME types	`application/x-nut`
Signatures	`6e75742f6d756c74696d6564696120636f6e7461696e6572` at byte 0 (NUT) `6e75742f6d756c74696d6564696120636f6e7461696e657200` at byte 0
PRONOM	`fmt/816`
Wikidata	`Q3334595`

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Open it

FFmpegOpen sourcereads and writes · LGPL-2.1-or-later / GPL-2.0-or-later
MPlayerOpen sourcereads · GNU General Public License, version 2.0 or later
Q2596578Open sourcereads · GNU General Public License, version 2.0
Q50938515Open sourcereads · GNU Affero General Public License, version 3.0 or later
xineOpen sourcereads · GNU General Public License
Xilisoft Video Converter 3reads

Convert it

To	With	Fidelity	Command and losses
FLAC (Free Lossless Audio Codec) 1.2.1	FFmpeg	Partial	`ffmpeg -i in.nut out.flac` Audio track only: the video is dropped.
Waveform Audio	FFmpeg	Partial	`ffmpeg -i in.nut out.wav` Audio track only: the video is dropped.
Matroska 1-4	FFmpeg	Lossy	`ffmpeg -i in.nut out.mkv` Re-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.nut out.mp3` Lossy re-encoding.
MPEG-4 Part 14	FFmpeg	Lossy	`ffmpeg -i in.nut out.mp4` Re-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.nut out.ogg` Lossy re-encoding.
WebM	FFmpeg	Lossy	`ffmpeg -i in.nut out.webm` Re-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.

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