CONVERT VOB → AVI (VOB to AVI)
Fast, secure VOB to AVI conversion. No registration required.
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HOW TO CONVERT VOB → AVI
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 AVI container — no quality loss, near-instant finish.
Retrieve the AVI
The AVI download is ready in seconds for stream-copy jobs, minutes for full transcodes.
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 AVI. If you need a AVI version of a VOB clip for a social platform, a stock site or a CMS upload widget, this tool handles the job without re-rendering anything when it does not have to. The output is the same pixel data in a container the destination actually accepts. In practice VOB is the DVD-Video container that holds the MPEG-2 streams on a DVD disc. On the other end, AVI is the legacy Microsoft Audio Video Interleave container from the 1990s.
Why convert VOB to AVI
Sending VOB to someone on a non-matching operating system frequently leads to "file cannot be opened". AVI avoids that by sitting in the middle of everyone's compatibility list. The repackage runs quickly and without generational loss when codecs already align.
VOB vs AVI — 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
- MIME Type
- video/dvd
- Category
- Video Files
- Full Name
- DVD Video Object
- Conversion Engine
- FFMPEG
AVI
- MIME type
- video/x-msvideo
- Extension
- .avi
- Container
- RIFF
- MIME Type
- video/x-msvideo
- Category
- Video Files
- Full Name
- AVI Video
- Conversion Engine
- FFMPEG
- Max file size
- 2 GB (original); 4 GB (OpenDML extension)
- Codec support
- Any codec via FourCC identifiers
| Specification | VOB | AVI |
|---|---|---|
| MIME type | video/dvd | video/x-msvideo |
| Extension | .vob | .avi |
| Container | MPEG-2 Program Stream with DVD extensions | RIFF |
| Video codec | MPEG-2 | — |
| Audio codecs | AC-3, DTS, MPEG audio, LPCM | — |
| MIME Type | video/dvd | video/x-msvideo |
| Category | Video Files | Video Files |
| Full Name | DVD Video Object | AVI Video |
| Conversion Engine | FFMPEG | FFMPEG |
| Max file size | — | 2 GB (original); 4 GB (OpenDML extension) |
| Codec support | — | Any codec via FourCC identifiers |
VOB vs AVI — 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.
AVI Strengths
- Simple, well-documented format — trivial for any video library to parse.
- Universal Windows playback since Video for Windows in 1992.
- Low encoding overhead — interleaved structure is fast to write.
- Works with any codec technically, including modern ones.
Limitations
- Aging container — no native support for chapters, subtitles, or multi-audio selection.
- File-size limits (2 GB original, 4 GB with OpenDML) break for HD content.
- Variable-framerate video causes sync drift.
Quality & Compatibility
Resolution, frame rate and colour space are preserved end-to-end. If the AVI 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 AVI when both containers support the same subtitle codec; otherwise burn the subtitles into the video first.
- For portrait (9:16) clips, make sure the AVI 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; AVI 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 AVI, 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".
DVD Video Object
Source formatVOB (Video Object) is the container format for DVD video content.
AVI Video
Target formatAVI is a legacy Microsoft multimedia container that stores audio and video data. While largely superseded by modern formats, it remains widely recognized and is produced by many older devices and screen recorders.
Common Use Cases
Share across platforms
Send AVI files to anyone without worrying about whether they have the right software for VOB.
Embed in documents
Drop AVI output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
AVI 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 AVI — Typical file sizes
Approximate file sizes for common scenarios.
- Single VOB segment ~1 GB (capped)
- 2-hour DVD movie (full VIDEO_TS) 4-7 GB
- 10-min video (XviD / MP3) 100-200 MB
- 45-min TV episode (DivX) 350-700 MB
- 2-hour movie (DVD rip) 700 MB - 1.4 GB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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