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driver
Software that controls a device, such
as a display card, and enables it to work with
other software.
drop-frame time code For NTSC video,
time code is normally produced by a
generator that counts at 30 frames per second.
NTSC color signals, however, actually have a
display frequency rate close to 29.97 frames
per second. Drop-frame time code
compensates for this time difference by
dropping two frames from the count every
minute except for every tenth minute so that
the time code matches clock time.
DV Digital Video. A standard digital bit
stream and compression format (known as the
Blue Book standard) used to record video and
audio onto a digital tape. DV is intra-frame
based, saving each frame separately, and uses
a fixed 5:1 compression ratio to reduce the
size of video files. DV's data rate is fixed at
25 Mb/sec (2.98 MB/sec). Video is sampled
at 4:1:1 for NTSC sources or 4:2:0 for PAL
sources. See also DVCAM, DVCPRO,
DVCPRO50, and D-9.
DVCAM A variant of the DV format
developed by Sony that records a 15 micron
track on a metal evaporated (ME) tape at a
data rate of 25 Mb/sec (2.98 MB/sec). Video
is sampled at 4:1:1 for NTSC sources or 4:2:0
for PAL sources.
DVCPRO A variant of the DV format
developed by Panasonic that records an 18
micron track on metal particle tape at a data
rate of 25 Mb/sec (2.98 MB/sec). Video is
sampled at 4:1:1 for both NTSC and PAL
sources. See also DVCPRO HD.
DVCPRO HD A high-definition variant of
the DVCPRO format developed by Panasonic
that uses a data rate of 100 Mb/sec. Matrox
Axio supports DVCPRO HD for 1080i and
720p sequences.
Appendix D, Matrox Axio Glossary
DVCPRO50 A variant of the DV format
developed by Panasonic that uses a data rate
of 50 Mb/sec (5.96 MB/sec), which is double
the data rate of most other DV formats. Video
is sampled at 4:2:2 for both NTSC and PAL
sources to give enhanced chroma resolution.
It uses the same type of tape as DVCPRO.
DVD Digital Versatile Disc or Digital Video
Disc. A type of compact disc that can hold
from 4.7 gigabytes (GB) to 17 GB of
information. The greatest advantage that
DVD has over CD is that it can store video as
well as audio and computer data. For video
storage, DVD uses MPEG-2 compression, to
provide better quality than standard VHS.
DVE Digital Video Effect. Generally, an
effect that resizes and repositions a picture on
the screen.
E
Edit Decision List (EDL) A file
containing a list of edit decision statements
used to create a video production.
edit master The first generation (original)
of a final edited tape.
expansion slot Electrical connection slot
mounted on a computer's motherboard (main
circuit board). It allows several peripheral
devices to be connected inside a computer.
See also AGP slot, PCI slot, PCI Express slot,
and PCI-X slot.
F
fade to black A transition commonly used
to signify the end of a scene, in which an
image or sound smoothly fades to a black
screen or silence (also called a fade-out
transition). Similarly, you could start a new
scene with a fade up from black (or fade-in)
transition.
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