CONVERT
VOB → NUT
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Fast, secure VOB to NUT conversion. No registration required.
Here is the short version — VOB is the DVD-Video container that holds the MPEG-2 streams on a DVD disc. Hence the need for NUT. A VOB to NUT conversion makes a recording portable. Video containers matter more than you might expect: players that handle NUT natively sometimes stutter or flat-out reject VOB with the same codec inside. Uploading above triggers a stream-level rewrap when possible, keeping the visible quality identical to the source. Context: VOB is the DVD-Video container that holds the MPEG-2 streams on a DVD disc. NUT is a video container, so playback depends on the codec inside as well as the wrapper itself.
DVD Video Object
Source formatVOB (Video Object) is the container format for DVD video content.
NUT Container
Target formatNUT is an open multimedia container format designed by MPlayer and FFmpeg developers as a simpler, more robust alternative to existing containers. It supports any codec and offers good error resilience with low overhead.
Why convert VOB to NUT
Sending VOB to someone on a non-matching operating system frequently leads to "file cannot be opened". NUT avoids that by sitting in the middle of everyone's compatibility list. The repackage runs quickly and without generational loss when codecs already align.
HOW TO CONVERT
VOB → NUT
Drop the video file
Select a VOB file. We read the container and stream descriptors to plan the conversion.
FFmpeg handles the repackage
When codecs align, FFmpeg rewraps the existing streams into a NUT container — no quality loss, near-instant finish.
Retrieve the NUT
The NUT download is ready in seconds for stream-copy jobs, minutes for full transcodes.
Common Use Cases
Share across platforms
Send NUT files to anyone without worrying about whether they have the right software for VOB.
Embed in documents
Drop NUT output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
NUT often produces smaller files than VOB for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
VOB vs NUT — Strengths and limitations
What each format does best, and where it falls short.
VOB Strengths
- Universal DVD support on every player ever made.
- Carries multiple audio tracks, subtitles, and menus in one container.
- Mature tooling ecosystem for extraction and editing.
Limitations
- Hard 1 GB file-size cap forces multi-file splits.
- MPEG-2 compression is 2-3× larger than modern codecs.
- Tied to CSS copy protection — decryption was once illegal.
NUT Strengths
- Technically efficient.
- Low overhead.
- FFmpeg-native support.
Limitations
- Tiny ecosystem.
- Overshadowed by MKV.
- Rarely used in production.
VOB vs NUT — Technical specifications
Side-by-side comparison of the technical details.
VOB
- MIME type
- video/dvd
- Extension
- .vob
- Container
- MPEG-2 Program Stream with DVD extensions
- Video codec
- MPEG-2
- Audio codecs
- AC-3, DTS, MPEG audio, LPCM
NUT
- MIME type
- video/x-nut
- Extension
- .nut
- Design
- FFmpeg/MPlayer collaborative spec
- Encoding
- Variable-length integers
| Specification | VOB | NUT |
|---|---|---|
| MIME type | video/dvd | video/x-nut |
| Extension | .vob | .nut |
| Container | MPEG-2 Program Stream with DVD extensions | — |
| Video codec | MPEG-2 | — |
| Audio codecs | AC-3, DTS, MPEG audio, LPCM | — |
| Design | — | FFmpeg/MPlayer collaborative spec |
| Encoding | — | Variable-length integers |
VOB vs NUT — Typical file sizes
Approximate file sizes for common scenarios.
VOB
- Single VOB segment ~1 GB (capped)
- 2-hour DVD movie (full VIDEO_TS) 4-7 GB
NUT
- 10-min H.264 clip 80-200 MB
Quality & Compatibility
Resolution, frame rate and colour space are preserved end-to-end. If the NUT container does not support some VOB features (chapters, multiple subtitle tracks, DRM-protected streams), those are flattened or dropped with a warning. Hard-coded subtitles in the video frames always survive.
Tips for Best Results
- Embedded subtitle tracks convert between VOB and NUT when both containers support the same subtitle codec; otherwise burn the subtitles into the video first.
- For portrait (9:16) clips, make sure the NUT encoder preserves the correct display aspect ratio — some players default to 16:9 if SAR is ambiguous.
- Long recordings (over an hour) benefit from chapter metadata; NUT may not preserve VOB chapters — check before relying on them.
Frequently Asked Questions
Only when it has to. If the codecs inside VOB (usually H.264 or H.265 for video, AAC for audio) are accepted by NUT, we stream-copy — the bytes are repackaged into the new container with zero re-encoding and no quality loss. When the source uses a codec the target does not support, we transcode at a matching bitrate to keep the visual quality close to the original.
With stream copy, expect the job to finish in seconds to tens of seconds regardless of video length — the work is mostly rewriting the container. Transcoding is slower (roughly real-time: a ten-minute clip takes about ten minutes) because every frame must be decoded and re-encoded. The progress bar shows which mode applies.
Yes. Resolution, frame rate, colour space and bit depth are preserved by default; stream copy is literally bit-identical on these parameters. If you explicitly pick a lower bitrate or a different codec in Advanced, the output is rebuilt to those settings, but the default is always "match the source".
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
Secure & Private Conversion
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