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The DVD-VR standard defines a logical format for video recording on
DVD-R DVD recordable and DVD rewritable are optical disc recording technologies. Both terms describe DVD optical discs that can be written to by a DVD recorder, whereas only 'rewritable' discs are able to erase and rewrite data. Data is written ('bur ...
,
DVD-RW DVD recordable and DVD rewritable are optical disc recording technologies. Both terms describe DVD optical discs that can be written to by a DVD recorder, whereas only 'rewritable' discs are able to erase and rewrite data. Data is written ('bur ...
, and
DVD-RAM DVD-RAM (DVD Random Access Memory) is a DVD-based disc specification presented in 1996 by the DVD Forum, which specifies rewritable DVD-RAM media and the appropriate DVD writers. DVD-RAM media have been used in computers as well as camcorders ...
style media, including the
dual layer Dual or Duals may refer to: Paired/two things * Dual (mathematics), a notion of paired concepts that mirror one another ** Dual (category theory), a formalization of mathematical duality *** see more cases in :Duality theories * Dual (grammatical ...
versions of these media. As opposed to media recorded with the DVD+VR recording standard, the resulting media are not DVD-Video compliant, and do not play back in some DVD-Video players. Most DVD video recorders in the market that support
DVD-R DVD recordable and DVD rewritable are optical disc recording technologies. Both terms describe DVD optical discs that can be written to by a DVD recorder, whereas only 'rewritable' discs are able to erase and rewrite data. Data is written ('bur ...
,
DVD-RW DVD recordable and DVD rewritable are optical disc recording technologies. Both terms describe DVD optical discs that can be written to by a DVD recorder, whereas only 'rewritable' discs are able to erase and rewrite data. Data is written ('bur ...
, or
DVD-RAM DVD-RAM (DVD Random Access Memory) is a DVD-based disc specification presented in 1996 by the DVD Forum, which specifies rewritable DVD-RAM media and the appropriate DVD writers. DVD-RAM media have been used in computers as well as camcorders ...
media record to these media in DVD-VR mode, as well as in a DVD-Video compliant mode. It is possible to use the DVD-VR format with DVD+R and DVD+RW media, but no examples are known other than some PC based recording utilities. The standard was introduced in 1999 by the DVD Forum, and licensing is managed by the DVD Format/Logo Licensing Corporation.Website of the ''DVD Format/Logo Licensing corporation''
/ref> For each of the supported media, the full recording standard consists of three parts being: Physical Specifications (Part 1), File System Specifications (Part 2), and the Video Recording Specifications (Part 3).


Feature overview

The DVD-VR specification allows implementing the following main features: * Video recording to
DVD-R DVD recordable and DVD rewritable are optical disc recording technologies. Both terms describe DVD optical discs that can be written to by a DVD recorder, whereas only 'rewritable' discs are able to erase and rewrite data. Data is written ('bur ...
,
DVD-RW DVD recordable and DVD rewritable are optical disc recording technologies. Both terms describe DVD optical discs that can be written to by a DVD recorder, whereas only 'rewritable' discs are able to erase and rewrite data. Data is written ('bur ...
, and
DVD-RAM DVD-RAM (DVD Random Access Memory) is a DVD-based disc specification presented in 1996 by the DVD Forum, which specifies rewritable DVD-RAM media and the appropriate DVD writers. DVD-RAM media have been used in computers as well as camcorders ...
. Newer versions of the standard have been extended to also allow recording to DVD-R Dual Layer media. * Up to 99 titles per disc. * Multiple play lists defining different playback-paths of the recorded content. * Adding chapters and bookmarks to a recording. * Support Main/Sub language for recording
bilingual Multilingualism is the use of more than one language, either by an individual speaker or by a group of speakers. It is believed that multilingual speakers outnumber monolingual speakers in the world's population. More than half of all Eu ...
broadcasting. * Frame-accurate editing of recorded content: Title split, title delete, partial title delete. * Fragmented recording: All unused space on the disc may be randomly added to new recordings. This is the opposite of the tape-model used by DVD+VR recorders. * Video and data files (such as digital pictures, or MP3 files) may be mixed on a single disc. * Multiple recording modes, up to 10.08 megabit per second ( DVD-Video quality). * Title and disc protection. * 16:9 and 4:3 material may be mixed within a single file with the display switching correctly (where supported). DVD-VR recorded media are not DVD-Video compliant, and do not play back in all DVD players. Some more recent DVD players, and also the
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PlayStation 2 The PlayStation 2 (PS2) is a home video game console developed and marketed by Sony Computer Entertainment. It was first released in Japan on 4 March 2000, in North America on 26 October 2000, in Europe on 24 November 2000, and in Australia o ...
, can play discs recorded in the DVD-VR format.


Technical format overview

The DVD-VR standard defines a logical format for recording and editing of video on a
DVD The DVD (common abbreviation for Digital Video Disc or Digital Versatile Disc) is a digital optical disc data storage format. It was invented and developed in 1995 and first released on November 1, 1996, in Japan. The medium can store any kin ...
disc. Instead of modifying the DVD-Video standard, a separate standard was created to allow for this. Video is recorded as an MPEG program stream. Video resolution depends on the recording quality and the video format used. Multiple audio encodings are allowed including MPEG Audio,
Dolby Digital Dolby Digital, originally synonymous with Dolby AC-3, is the name for what has now become a family of audio compression technologies developed by Dolby Laboratories. Formerly named Dolby Stereo Digital until 1995, the audio compression is lossy ( ...
(AC-3) and linear PCM.


Directory and file structure


VRO file format

A DVD-VR recorded disc contains a 'DVD_RTAV' directory in the root of the filesystem, in which a single 'VR_MOVIE.VRO' file exists, containing the raw audio and video data for all video recordings on the disc. The recording metadata along with navigation data to represent playlist, programs, and so on are also stored in the 'VR_MANGR.IFO' file in the same directory. A backup copy of this file (VR_MANGR.BUP) typically is present as well to provide data redundancy. Unlike standard DVD-Video recordings, the aspect ratio (4:3 or 16:9) is contained in the file itself as part of the video stream. Thus DVD-VR supports mixed format presentations within a single file. Contrast DVD-Video where the aspect ratio is coded into the accompanying file and thus a single file can be in a single aspect ratio only. VRO is a
container format A container format (informally, sometimes called a wrapper) or metafile is a file format that allows multiple data streams to be embedded into a single file, usually along with metadata for identifying and further detailing those streams. Notab ...
for multiplexed audiovisual content.DVD Demystified (July 13, 2009
What are .IFO, .VOB, .AOB, and .VRO files? How can I play them?
, Retrieved on 2009-07-28
VRO file is an equivalent to a collection of DVD-Video VOB files. If one does not care about edits (e.g., deleting recorded videos), one can play the VRO directly as if it were a standard DVD-Video VOB file.DVD-VR Application format notes
Retrieved on 2009-07-28
Fragmented VRO files are not widely supported by software players and video editing software.


File system

The file system used on the media is UDF Revision 2.0. Packet writing technology is used to allow random access to, and incremental updating of the optical media.


See also

* DVD+VR * VR Mode *
VOB VOB (for video object) is the container format in DVD-Video media. VOB can contain digital video, digital audio, subtitles, DVD menus and navigation contents multiplexed together into a stream form. Files in VOB format may be encrypted. File f ...
* DVD formats * Universal Disk Format *
DVD-RW DVD recordable and DVD rewritable are optical disc recording technologies. Both terms describe DVD optical discs that can be written to by a DVD recorder, whereas only 'rewritable' discs are able to erase and rewrite data. Data is written ('bur ...
,
DVD-R DVD recordable and DVD rewritable are optical disc recording technologies. Both terms describe DVD optical discs that can be written to by a DVD recorder, whereas only 'rewritable' discs are able to erase and rewrite data. Data is written ('bur ...
,
DVD-RAM DVD-RAM (DVD Random Access Memory) is a DVD-based disc specification presented in 1996 by the DVD Forum, which specifies rewritable DVD-RAM media and the appropriate DVD writers. DVD-RAM media have been used in computers as well as camcorders ...
, and DVD-R9 * DVD-AR


References


External links


DVD Format/Logo Licensing Corporation

DVD Forum
{{DEFAULTSORT:Dvd-Vr DVD