^ a b "DVD - MPeg (sic.) differences".^ DVD FLLC DVD Format Book - History of Supplements for DVD Books, Retrieved on.^ DVD FLLC (2009-02) DVD Book Construction - list of all available DVD Books, Retrieved on.KMPlayer, VLC media player, GOM player, Media Player Classic and more platform-specific players like ALLPlayer play VOB files. Other audio compression formats such as AC-3 or DTS are less widely supported. Playback Ī player of generic MPEG-2 files can usually play unencrypted VOB files, which contain MPEG-1 Audio Layer II audio. In some countries, their usage can be a violation of law (e.g. There are many CSS-decrypting programs, or ripping software, such as libdvdcss, DeCSS, DVD Decrypter, AnyDVD or DVD Shrink which allow a protected DVD-Video disc to be played without access to the original key or copied to hard disk unscrambled. If the copied undecrypted VOB files are opened in a player, they will request the keys from the DVD-ROM drive and will fail. Authentication of the disc allows the copying of individual VOB files without error, but the encryption keys will not be copied. If someone is trying to copy the contents of an encrypted DVD-Video (e.g., VOB files) to a hard drive, an error can occur, because the DVD was not authenticated in the drive by CSS decryption software.
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Decryption and authentication keys needed for playing back encrypted VOB files are stored in the normally inaccessible lead-in area of the DVD and are used only by CSS decryption software (e.g., in a DVD player or software player). This is a data encryption and communications authentication method designed to prevent copying video and audio data directly from the DVD-Video discs. Many DVD-Video titles are encrypted with Content Scramble System (CSS). Copy protection is usually used for copyrighted content. Video players may not allow DVD navigation when IFO or BUP files are absent.Īlmost all commercially produced DVD-Video titles use some restriction or copy protection method, which also affects VOB files. BUP (backup) files are exact redundant copies of IFO files, supplied to help in case of corruption. IFO (information) files contain all the information a DVD player needs to know about a DVD so that the user can navigate and play all DVD content properly, such as where a chapter starts, where a certain audio or subtitle stream is located, information about menu functions and navigation. VOB files may be accompanied with IFO and BUP files. For other uses, see IFO (disambiguation).
On the DVD, all of the content for one title set is contiguous, but if necessary is broken up into 1 GB VOB files in order to be compatible with all operating systems, as some cannot read files larger than that size. VOB files cannot contain AAC audio (MPEG-2 Part 7), MPEG-4 compression formats and others, which are allowed in the MPEG program stream standard. In addition, a VOB file can contain linear PCM, AC-3 or DTS audio and subpictures (subtitles). Īnalogous to the MPEG program stream, a VOB file can contain H.262/MPEG-2 Part 2 or MPEG-1 Part 2 video, MPEG-1 Audio Layer II or MPEG-2 Audio Layer II audio, but usage of these compression formats in a VOB file has some restrictions in comparison to the MPEG program stream. While all VOB files are MPEG program streams, not all MPEG program streams comply with the definition for a VOB file. VOB files are a very strict subset of the MPEG program stream standard. The MPEG program stream has provisions for non-standard data (as used in VOB files) in the form of so-called private streams. The VOB format is based on the MPEG program stream format, but with additional limitations and specifications in the private streams. vob filename extension and are typically stored in the VIDEO_TS directory at the root of a DVD.
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