VOB vs Y4M
A detailed comparison of DVD Video Object and YUV4MPEG2 — file size, quality, compatibility, and which format to choose for your workflow.
DVD Video Object
Video FilesVOB (Video Object) is the container format for DVD video content.
About VOB filesYUV4MPEG2
Video FilesYUV4MPEG2 (Y4M) is a simple uncompressed video format that stores raw YUV pixel data with a minimal header. It is widely used as an intermediate format for video processing and quality benchmarking where no compression artifacts are acceptable.
About Y4M filesStrengths Comparison
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.
Y4M Strengths
- Uncompressed raw YUV — codec benchmark truth.
- Dead-simple header.
- Universal codec development support.
Limitations
VOB 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.
Y4M Limitations
- Enormous file sizes.
- Development-only — not for consumption.
- No metadata beyond basic stream params.
Technical Specifications
| Specification | VOB | Y4M |
|---|---|---|
| MIME type | video/dvd | video/x-yuv4mpeg2 |
| Extension | .vob | .y4m |
| Container | MPEG-2 Program Stream with DVD extensions | — |
| Video codec | MPEG-2 | — |
| Audio codecs | AC-3, DTS, MPEG audio, LPCM | — |
| Pixel format | — | YUV 4:2:0, 4:2:2, 4:4:4 |
| Header | — | ASCII single line |
Typical File Sizes
VOB
- Single VOB segment ~1 GB (capped)
- 2-hour DVD movie (full VIDEO_TS) 4-7 GB
Y4M
- 10 sec 1080p Y4M ~600 MB
- 1 min 4K Y4M ~14 GB
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Convert between VOB and Y4M online, free, and without installing anything. Encrypted upload, automatic deletion after 60 minutes.
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.
VOB (DVD Video Object) is a video container formato that bundles one ou more video streams, audio tracks, e optional subtitles em a single file. The container formato determines how metadata is organised e which codecs can live inside; the visual quality itself depende de the codec (H.264, H.265, VP9, AV1) em vez de the VOB wrapper. It is part of the video arquivos 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.
VLC, MPV e PotPlayer reproduzir nearly every VOB arquivo on desktop. Browser support varies: moderno Chromium, Firefox e Safari reproduzir common containers via the HTML5 <video> tag, mas niche VOB variants may fail. If a device refuses your VOB, converter to MP4 com our VOB to MP4 converter para 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.