Can VOB Files Be Outside the VIDEO_TS Directory?

A VOB (Video Object) file cannot be placed outside the VIDEO_TS directory and still conform to the official DVD-Video standard. The DVD-Video specification mandates a rigid directory hierarchy and file-naming convention that standalone players rely on to recognize and play media. While a VOB file located elsewhere on a disc can still be accessed as raw data by a computer, hardware DVD players and standard-compliant software players will ignore it, rendering the disc non-compliant with standard DVD-Video specifications.

The DVD-Video Standard Requirement

The official DVD-Video format (governed by the DVD Forum's DVD Specifications for Read-Only Disc, Part 3: Video Specifications) requires a specific directory structure on the disc's file system (typically UDF Bridge, combining UDF and ISO 9660).

At the root level of the disc, there must be a directory named VIDEO_TS in all uppercase letters. All files that constitute the DVD-Video program—including Navigation Information files (.IFO), backup files (.BUP), and Video Object files (.VOB)—must reside directly within this folder.

How Players Process the Disc

Standalone DVD players are built with dedicated firmware designed to locate the VIDEO_TS directory immediately upon mounting a disc. The player reads VIDEO_TS.IFO to determine the disc's menu structure, titles, audio tracks, and sector pointers.

Because the sector allocation and playback chains defined in the IFO files are explicitly tied to the contents within VIDEO_TS, the playback engine does not scan the rest of the file system. Any VOB file outside this directory is completely invisible to the DVD-Video parsing engine.

DVD-ROM and Hybrid Discs

It is possible to place VOB files in other directories on a DVD, but only as arbitrary data files on a hybrid disc (DVD-ROM / DVD-Plus). In this scenario:

• The disc conforms to standard data file system rules (such as ISO 9660 or UDF), allowing computers to browse and open the external VOB files as individual media streams.
• The portion of the disc outside VIDEO_TS does not conform to the DVD-Video standard and will not be accessible to traditional home theater DVD players.

To create a fully compliant DVD-Video disc that guarantees universal playback across all certified DVD players, every VOB file used for playback must strictly reside inside the VIDEO_TS directory.