DVD glossary
- Variable Bit Rate (VBR)
Data compression technique that produces an
output data stream varying between fixed minimum and maximum rates, with
bandwidth decreasing or increasing depending on the complexity of the fixed
rate incoming data.
- Verification
Process of matching information on a copy to
that on the original.
- VIDEO CD
Special CD-Bridge implementation for MPEG-1
digital videož specified in the White Book.
- Volume
A dismountable CD-ROM disc. A mountable sector
address space consisting of a single set of sector addresses, usually as a
continuous sequence of sectors, and containing one or more directory
hierarchies.
- Volume Descriptor
One sector containing information describing the
volume. If multiple volume descriptors are present, then the volume descriptor
set must be recorded in consecutively numbered logical sectors.
- Volume Set
A collection of one or more volumes with
identical volume set identification, on which a set of files is recorded.
- Volume Space
The set of all logical sectors on a volume
encompassing the system and data areas.
Variable Rate Bitstream (VBR)
The flow of data being processed on a DVD can be variable, depending on the
complexity of the information being processed. Fast moving, dynamic scenes
require a high data rate, while a static (non-moving) image requires a lower
data rate.
Vertical Blanking Interval (VBI)
In analog television, these are the first few scan lines within a field that do
not contain picture information. They appear as static at the top of the image.
Since these scan lines are not used to convey picture information, they become
the natural place to insert side information such as teletext and closed caption
bitstreams.
Video
CD (VCD)
A digital video disc format using MPEG1 encoding, normally playable on DVD
players. Its VHS quality picture and limited shortage capacity prevented it from
ever becoming fully caught on.
Video
Manager
Top level menu linking multiple tiles from a common point.
Video
Manager Information (VMGI)
Points to the various titles that comprise the disc volume and identifies disc
side and content type.
Video
Object (VOB)
Usually a group of pictures.
Video
Tile Set (VTS)
A maximum of 10 files (in ISO 9660 structure) may comprise a video tile set. A
Management File precedes each video tile set. Each file in turn is limited to 1
GByte in size.
Video
Tile Set Information (VTSI)
Describes the nature of the VTS.
Video_TS
UDF filename used for video directory on disc volume. Files under this directory
name contain pointers to the sectors on the disc that hold the program streams.
Volume
Management Information
Identifies disc side and content type.
Volume
Space
Collection of sectors that make up the volume. Not all sectors on the disc
comprise the volume. Some near the inner and outer spiral are used as leaders.
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