What is it?VOB (Video Object) is the container format used on standard DVD-Video discs. VOB files are stored in the VIDEO_TS folder of a DVD and contain the actual video, audio, subtitles, and navigation data for the disc. Introduced with the DVD specification in 1996, VOB uses MPEG-2 video encoding and supports Dolby Digital (AC-3) and DTS audio tracks along with subtitle streams.
A typical DVD movie is split into multiple VOB files, each limited to approximately 1 GB to comply with the DVD filesystem (UDF/ISO 9660) specifications. The first file (VIDEO_TS.VOB) contains menu data, while numbered files like VTS_01_1.VOB, VTS_01_2.VOB contain the main feature film. VOB files are closely related to MPEG-2 Program Streams and can often be played directly by media players that support DVD video.
Need to convert your VOB files? Use our free online converter.Convert VOB FilesTechnical SpecificationsStandardDVD-Video specification (DVD Forum)Introduced1996File Extension.vobMIME Typevideo/dvdVideo CodecMPEG-2Audio CodecsDolby Digital (AC-3), DTS, MPEG Audio, PCMMax File Sizeapproximately 1 GB per VOB fileContainer BaseMPEG-2 Program StreamPros & ConsAdvantagesDVD Standard Compliance | FileFormerRequired format for all commercially produced and consumer-authored DVD-Video discs.
Multi-Track Support | FileFormerSupports multiple audio tracks (different languages) and subtitle streams in a single file.
Widely Playable | FileFormerMost media players including VLC can play VOB files directly without special configuration.
Chapters and Menus | FileFormerContains navigation data for DVD chapter selection and interactive menus.
DisadvantagesDVD-Only Format | FileFormerVOB is specifically tied to the DVD standard and has no use outside of DVD authoring and playback.
Limited to Standard Definition | FileFormerThe DVD specification supports up to 720x576 (PAL) or 720x480 (NTSC) resolution, not HD.
Older Compression | FileFormerMPEG-2 video is far less efficient than modern codecs, producing much larger files than necessary.
DRM Encryption | FileFormerCommercial DVD VOB files are encrypted with CSS (Content Scramble System), requiring authorized playback.
When to Use ItHere are the most common situations where VOB is the right choice:
DVD Playback | FileFormerVOB files are what DVD players and computer drives read when you play a DVD movie.
DVD Backup | FileFormerCreating a backup copy of a DVD disc involves copying the VOB files to your hard drive.
Format Conversion | FileFormerConvert VOB files to MP4 or MKV to play DVD content on modern devices without a disc drive.
DVD Authoring | FileFormerWhen creating a DVD-Video disc, your authoring software produces VOB files as the output.
Convert VOB FilesNeed to convert your VOB files? Use our free online converter.
Convert VOB Files参考资料MPEG-2 Program Stream (VOB on DVD-Video) - Library of CongressISO/IEC 13818-1 MPEG-2 Systems (Program Stream) - ISOVOB - Wikipedia