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Glossary
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AVI
Audio video interleave. A file format for digital video and audio data that is defined
by Microsoft Corporation. Files have the extension
.avi . AVI files can contain video
and audio that are compressed with a wide variety of codec s.
There are two AVI formats: Type 1 and Type 2. Type 1 files contain a single stream
of interleaved video and audio. whereas Type 2 files contain separate video and audio
streams. DVDit Pro HD supports both formats.
BD
Blu-ray Disc. Writable discs are known as BD-R. Rewritable discs are BD-RE.
Prerecorded discs are known as BD-ROM.
B-picture
Bi-directionally predictively coded picture. An MPEG video picture that contains
only the information that is different from previous and subsequent frames or fields.
See also
GOP , I-picture , P-picture .
bit
Binary digit. The smallest unit of digital information. Eight bits make one byte .
bit depth
The number of bits used to represent the color and brightness of each pixel in a bitmap
image, expressed in bits per pixel. A 1-bit image has two (2
1
) colors (black and
white), a 2-bit image has four (2
2
) colors, and so on. Full-color images are 24 or 32
bits per pixel; 24-bit images can contain 16,777,216 (2
24
) colors, whereas 32-bit
images can contain 4,294,967,296 (2
32
) colors. Also known as color depth.
bit rate
Volume of data transmitted or retrieved. Measured in bits per second.
bitmap
A digital image that is represented by a two-dimensional grid of pixels. There are
many bitmap file formats, including Windows bitmap, JPEG, and TIFF.
bps
Bits per second. A unit of measurement for data rates.
BUP file
A backup copy of the IFO file on a DVD-Video disc.
button
A graphic object on a DVD menu that links to a movie or another menu. When a
viewer selects and activates the button, the DVD player displays the linked material.
Each button can have a subpicture that changes color and/or opacity when the button
is selected and activated.
byte
A unit of data containing eight bit s. Digital data storage is usually measured in bytes,
whereas digital data rates are usually measured in bits (per second).
CBR
encoding
Constant bit-rate encoding. A method of encoding MPEG video streams by allocating
the same number of bits to every second of video, regardless of its complexity.
Redundant data is added to the stream when there is little action, and greater
compression is applied (resulting in lower quality) as the video complexity increases.
Compare with
VBR encoding .
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