DVD-VR
The DVD-VR standard defines a logical format for video recording on
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.[1] 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 Dual Layermedia.
- 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 bilingualbroadcasting.
- 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+VRrecorders.
- 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 Sony PlayStation 2, 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 disc. Instead of modifying the DVD-Video standard, a separate standard was created to allow for this.
Video is recorded as an
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 .VRO file itself as part of the video stream. Thus DVD-VR supports mixed format presentations within a single .VRO file. Contrast DVD-Video where the aspect ratio is coded into the accompanying .IFO file and thus a single .VOB file can be in a single aspect ratio only.
VRO is a
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
- DVD formats
- Universal Disk Format
- DVD-R9
- DVD-AR
References
- ^ "DVD Format/Logo Licensing Corporation". www.dvdfllc.co.jp.
- ^ a b DVD Demystified (July 13, 2009) What are .IFO, .VOB, .AOB, and .VRO files? How can I play them? Archived 2011-07-09 at the Wayback Machine, Retrieved on 2009-07-28
- ^ Doom9's forum (2002-2005) DVD-RAM *.VRO File Conversion, Retrieved on 2009-07-28
- ^ DVD-VR Application format notes, Retrieved on 2009-07-28