FormatDrop
Video Format

VOB

Video Object (DVD)

VOB files are the actual video and audio data from DVD discs — if you've browsed a DVD's VIDEO_TS folder, you've seen them. They contain MPEG-2 video plus Dolby Digital (AC3) or MPEG audio. VOB files from your own DVDs can be converted to MP4 for storage, playback on modern devices, and archiving your DVD collection.

What is VOB?

VOB (Video Object) is the container format used on DVD-Video discs. The DVD-Video standard (ISO 13346) was finalized in 1996 and defines how video, audio, subtitles, and menu data are organized on a DVD. A DVD's VIDEO_TS folder contains: VIDEO_TS.IFO (menu/chapter structure), VIDEO_TS.BUP (backup of IFO), VTS_01_0.IFO (title set information), VTS_01_0.VOB (menu video), VTS_01_1.VOB, VTS_01_2.VOB... (main video, split into ~1GB chunks), VTS_01_0.BUP (backup). VOB files contain multiplexed: MPEG-2 video (720×480 NTSC or 720×576 PAL, 2-9.8 Mbps), up to 8 audio tracks in Dolby Digital (AC3), MPEG-2 audio, DTS, or LPCM, up to 32 subtitle streams (stored as bitmap images), navigation data. VOB files are limited to 1GB each because the original DVD file system (ISO 9660) didn't support files larger than 1GB. A 2-hour movie is typically split into 4-6 VOB files. CSS (Content Scramble System) is a DRM system used on commercial DVDs. CSS-encrypted VOB files can't be copied or converted without decryption. Most ripping software handles CSS decryption, but doing so may be legally restricted in some jurisdictions (the US DMCA, for example). Home-recorded DVDs don't use CSS and are freely convertible.

VOB pros and cons

Advantages

  • Universal DVD player compatibility
  • Multiple audio tracks and subtitle streams in one file
  • Well-documented format — many tools support it
  • Standard for DVD-Video production

Limitations

  • Not supported on modern devices (iPhone, Android, streaming)
  • 1GB file size limit — long videos are split across multiple VOBs
  • MPEG-2 compression is inefficient compared to H.264
  • CSS DRM on commercial DVDs restricts conversion
  • Requires VLC or codec packs to play on Windows
  • No metadata support beyond what IFO files provide

When should you convert VOB files?

Convert VOB to MP4 for: archiving your DVD collection in a modern format (H.264 at equivalent quality is ~1/3 the file size of MPEG-2 DVD), playing DVD content on Apple TV, iPhone, iPad, and Android devices, editing DVD footage in modern video editors (most don't accept VOB natively), and streaming DVD content via Plex or Jellyfin (convert first or let the server transcode). HandBrake is the standard tool for DVD-to-MP4 conversion — it handles VOB files, CSS-encrypted discs (on supported systems), and produces excellent H.264 or H.265 output.

Convert VOB files

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VOB FAQ

How do I convert VOB to MP4?
HandBrake (free): open the DVD disc or VIDEO_TS folder → HandBrake auto-detects the titles → choose MP4 or MKV output → H.264 or H.265 codec → Start Encode. FFmpeg: ffmpeg -i VTS_01_1.VOB -c:v libx264 -crf 18 -c:a aac output.mp4 (for a single VOB). For a complete movie split across multiple VOBs, HandBrake handles the concatenation automatically.
Can I convert a commercial DVD to MP4?
The technical process: HandBrake on most systems can decrypt CSS and rip commercial DVDs. The legal situation: in the US, the DMCA prohibits circumventing CSS copy protection, even for personal backup purposes. In the EU, the situation varies by country. In practice, many people rip their DVD collections for personal use. Check the laws in your jurisdiction before ripping commercial DVDs.
Why are my VOB files 1GB maximum?
DVDs use a variant of the ISO 9660 file system which has a 2GB file size limit (with DVD extensions, effective limit was ~1GB for reliable cross-platform compatibility). VOB files are artificially split at this boundary. When ripping a DVD with HandBrake, it concatenates all VOBs for a title and encodes them as a single MP4 — the 1GB per VOB limitation disappears in the output file.

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