About VOB Files
DVD Video Object
VOB (Video Object) is the container format for DVD video content.
Family
Video Files
Extension
.vob
MIME Type
video/dvd, video/mpeg
Can Use As
HOW VOB
CAME TO BE.
VOB — Video OBject — is the container the DVD Forum chose for DVD-Video when the format launched commercially in 1997. Every DVD’s VIDEO_TS folder contains a series of .vob files, each up to 1 GB, holding MPEG-2 video, up to 8 AC-3 audio tracks, subtitle streams, and menu navigation commands. A typical feature film spans 3-7 VOB files.
Extracting or editing VOBs became a cottage industry during the DVD piracy era (1999-2005). Tools like DVD Decrypter, Shrink, and HandBrake could "rip" a DVD by reading VOBs (after breaking CSS copy protection) and re-encoding to DivX/XviD AVI. Today VOBs appear mostly as intermediate files when someone rips a physical DVD to digital — a dying occurrence now that streaming has largely replaced disc purchase.
CURIOSITIES &
TRIVIA.
Every DVD's VIDEO_TS folder contains one or more .vob files — each capped at 1 GB to match FAT32 filesystem limits of the 1997 era.
A 2-hour DVD movie is typically split across 3 VOB files: 1 GB + 1 GB + ~800 MB.
VOBs are technically MPEG Program Streams with a DVD-specific layer on top for menus and multi-angle shots.
The notorious DeCSS program (1999) unlocked VOB files from CSS copy protection — the landmark DMCA court cases were about VOB decryption.
Modern Blu-ray replaced VOB with MPEG Transport Stream (.m2ts) in a BDMV/STREAM folder structure.
STRENGTHS &
LIMITATIONS.
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.
- Disc-era format; streaming replaced DVDs for most users.
Typical Sizes & Weights
Single VOB segment
~1 GB (capped)
2-hour DVD movie (full VIDEO_TS)
4-7 GB
Technical Specifications
- 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
CONVERT FROM
VOB
Common Use Cases
DVD ripping, legacy video
Related Formats
Popular comparisons
VOB vs MP4
Differences, file size, and when to choose each format.
VOB vs JPG
Differences, file size, and when to choose each format.
VOB vs PNG
Differences, file size, and when to choose each format.
VOB vs WEBP
Differences, file size, and when to choose each format.
VOB vs GIF
Differences, file size, and when to choose each format.
VOB vs BMP
Differences, file size, and when to choose each format.
Popular VOB conversions
The most-requested destinations when starting from VOB.
Frequently Asked Questions about VOB
Frequently Asked Questions
VOB (DVD Video Object) is a video container format that bundles one or more video streams, audio tracks, and optional subtitles into a single file. The container format determines how metadata is organised and which codecs can live inside; the visual quality itself depends on the codec (H.264, H.265, VP9, AV1) rather than the VOB wrapper. It is part of the video files family.
VLC, MPV and PotPlayer play nearly every VOB file on desktop. Browser support varies: modern Chromium, Firefox and Safari play common containers via the HTML5 <video> tag, but niche VOB variants may fail. If a device refuses your VOB, convert to MP4 with our VOB to MP4 converter for universal playback.
Upload your VOB to KaijuConverter and pick MP4, MOV, MKV, WebM, or any other target. Our pipeline uses FFmpeg under the hood and stream-copies when codecs are compatible (no quality loss) or transcodes at high-quality defaults otherwise. Conversion runs server-side; both files delete within two hours.
Only when the target requires re-encoding. If the codecs inside VOB match what the target container supports, FFmpeg stream-copies the streams and the output is bit-identical to the source. Transcoding uses transparent quality defaults (CRF 20–23 H.264) and produces output indistinguishable from the original at normal viewing distance.