VBI - Vertical blanking interval. The scan lines in a television signal that do not contain picture information. These lines are present to allow the electron scanning beam to return to the top and are used to contain auxiliary information such as closed captions.
VBR - Variable bit rate. Data that can be read and processed at a volume that varies over time. A data compression technique that produces a data stream between a fixed minimum and maximum rate. A constant level of compression is generally maintained, with the required bandwidth increasing or decreasing depending on the complexity (the amount of spatial and temporal energy) of the data being encoded. In other words, data rate is held constant while quality is allowed to vary. Compare to CBR.
VBV - Video buffering verifier. A hypothetical decoder that is conceptually connected to the output of an MPEG video encoder. Provides a constraint on the variability of the data rate that an encoder can produce.
VCAP Video Capable Audio Player - An audio player which can read the limited subset of video features defined for the DVD-Audio format. (Constrast with universal DVD player.)
VCD - Video Compact Disc. Near-VHS-quality MPEG-1 video on CD. Used primarily in Asia.
VfW - See Video for Windows.
VGA (Video Graphics Array) - A standard analog monitor interface for computers. Also a video graphics resolution of 640 x 480 pixels.
VHS - Video Home System. The most popular system of videotape for home use. Developed by JVC.
Video CD - An extension of CD based on MPEG-1 video and audio. Allows playback of near-VHS-quality video on a Video CD player, CD-i player, or computer with MPEG decoding capability.
Video for Windows - The system software additions used for motion video playback in Microsoft Windows. Replaced in newer versions of Windows by DirectShow (formerly called ActiveMovie).
Video manager (VMG) - The disc menu. Also called the title selection menu.
Video title set (VTS) - A set of one to ten files holding the contents of a title.
videophile - Someone with an avid interest in watching videos or in making video recordings. Videophiles are often very particular about audio quality, picture quality, and aspect ratio to the point of snobbishness.
VLC - Variable length coding. See Huffman coding.
VOB - Video object. A small physical unit of DVD-Video data storage, usually a GOP.
volume - A logical unit representing all the data on one side of a disc.
VSDA - Video Software Dealers Association. (See Appendix C.)
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