CONVERT VOB → MKV (VOB to MKV)
Fast, secure VOB to MKV conversion. No registration required.
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HOW TO CONVERT VOB → MKV
Upload the VOB
Drop your VOB onto the uploader. Files up to 25 MB run on the free tier without registration; paid plans go up to 2 GB.
Stream-copy or re-encode
FFmpeg probes the codecs; if compatible, it stream-copies (no quality loss). Otherwise it transcodes at matching bitrate.
Download the MKV
Fetch the converted MKV as soon as it is ready. Both files auto-delete within two hours.
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 MKV. Repackaging a VOB file into MKV is one of the fastest video jobs there is. When the codecs already match the target container specification, the bytes are literally copied across — no re-encoding, no quality drop, no long wait. Upload above and watch the progress bar usually fly. Background. VOB is the DVD-Video container that holds the MPEG-2 streams on a DVD disc. Destination side, MKV is the Matroska container, flexible enough to carry nearly any codec plus chapters and subtitles.
Why convert VOB to MKV
Matroska Video is better supported than DVD Video Object across web uploads, social networks and consumer devices. Converting trades the niche advantages of VOB for broad playback and fewer "file type not supported" messages. Stream copy (when codecs match) keeps the video bit-identical to the source.
VOB vs MKV — 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
MKV
- MIME type
- video/x-matroska
- Extension
- .mkv
- MIME Type
- video/x-matroska
- Category
- Video Files
- Full Name
- Matroska Video
- Conversion Engine
- FFMPEG
- Extensions
- .mkv, .mka (audio), .mks (subtitles)
- Container structure
- EBML (Extensible Binary Meta Language)
- Related
- WebM (restricted MKV subset)
- Max tracks
- Practically unlimited
| Specification | VOB | MKV |
|---|---|---|
| MIME type | video/dvd | video/x-matroska |
| Extension | .vob | .mkv |
| Container | MPEG-2 Program Stream with DVD extensions | — |
| Video codec | MPEG-2 | — |
| Audio codecs | AC-3, DTS, MPEG audio, LPCM | — |
| MIME Type | video/dvd | video/x-matroska |
| Category | Video Files | Video Files |
| Full Name | DVD Video Object | Matroska Video |
| Conversion Engine | FFMPEG | FFMPEG |
| Extensions | — | .mkv, .mka (audio), .mks (subtitles) |
| Container structure | — | EBML (Extensible Binary Meta Language) |
| Related | — | WebM (restricted MKV subset) |
| Max tracks | — | Practically unlimited |
VOB vs MKV — 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.
MKV Strengths
- Carries virtually any codec — H.264, H.265, AV1, VP9, Opus, FLAC, AAC, you name it.
- Multiple audio and subtitle tracks, chapters, and menus in one file.
- Patent-free container — no licensing fees.
- Attached fonts and metadata ride along for self-contained playback.
- Streamable and seekable with built-in index/cue tables.
Limitations
- Not natively supported in Apple's QuickTime or Safari without third-party tools.
- Windows needed codec packs (or "Films & TV" app updates) to play it out of the box.
- Hardware decoders on older TVs and streamers often reject MKV.
Quality & Compatibility
Stream-copy is bit-perfect: when the codecs inside VOB match what MKV can carry, the frames are copied across without re-encoding and the output is visually identical to the source. When transcoding is required, we target CRF 20–23 H.264 — visually transparent for most content — and keep audio bitrate at 192 kbps AAC.
Tips for Best Results
- Stream-copy beats re-encoding by orders of magnitude — check if your VOB already uses MKV-compatible codecs before picking Advanced settings.
- For social uploads, 1080p at 30 fps strikes the best quality-to-size ratio; 4K is often downscaled server-side anyway.
- Keep the VOB if you plan further editing — transcoded MKV is fine for final delivery but not for intermediate edits.
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 MKV, 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.
Matroska Video
Target formatMKV is a flexible, open-standard container format that can hold unlimited video, audio, subtitle, and metadata tracks. It is popular for high-definition video and supports virtually any codec.
Common Use Cases
Share across platforms
Send MKV files to anyone without worrying about whether they have the right software for VOB.
Embed in documents
Drop MKV output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
MKV 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 MKV — 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
- 45-min episode (H.264 1080p) 800 MB - 1.6 GB
- 2-hour movie (H.265 1080p) 1.5-3 GB
- 2-hour movie (4K HDR H.265) 15-40 GB
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Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
MKV/Matroska Container Format: The Open-Source Multimedia Powerhouse
Complete guide to MKV/Matroska container format: EBML architecture, unlimited codec support, chapter systems, PGS/ASS subtitles, mkvtoolnix commands, and...
Read guide →MKV (Matroska) Video Container: Complete Format Guide
Everything about MKV video containers — how Matroska works, supported codecs, subtitle tracks, chapters, and how to convert MKV files.
Read guide →VOB Format Guide: DVD Video Files Explained
Complete guide to VOB files — the DVD video format. Learn the DVD directory structure (IFO/BUP/VOB), codecs inside VOB, and how to convert VOB to MP4 or MKV...
Read guide →
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