Matrox Axio Installation And User Manual page 258

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determines its brightness on a scale from
black to white. See also chrominance.
luminance key See luma key.
M
mark in To select the first frame of a clip.
mark out To select the last frame of a clip.
M-JPEG
See Motion-JPEG.
Motion-JPEG
standard used for motion video. The JPEG
compression process is applied to each video
field, in succession. Also called M-JPEG.
MP@ML Main Profile@Main Level. An
MPEG-2 video compression profile that
supports 4:2:0 luminance/chrominance
sampling at up to 720×576 pixel resolution,
and data transfer rates up to 15 Mb/sec (1.79
MB/sec). This profile is used for broadcast
transmission and distribution on DVD. See
also 4:2:2P@ML.
MPEG A video compression standard that
specifies a series of compression profiles and
image resolution levels, introduced in 1990 by
the Motion Picture Experts Group. MPEG
takes advantage of the redundancy inherent in
video data through a combination of
inter-frame and intra-frame redundancy
reduction. The MPEG standard supports data
transfer rates of up to 1.5 Mb/sec (0.2
MB/sec). Also called MPEG-1. See also
MPEG-2, inter-frame (IBP) compression, and
intra-frame (I-frame) compression.
MPEG-1 See MPEG.
MPEG-2 A video compression standard
that improves upon the MPEG standard by
supporting data rates of up to 100 Mb/sec (12
MB/sec), scalable modes, field or frame
searching, and much larger screen sizes. See
also intra-frame (I-frame) compression,
Appendix D, Matrox Axio Glossary
A compression and storage
inter-frame (IBP) compression, 4:2:2P@ML,
and MP@ML.
MPEG-2 IBP An MPEG-2 compression
type that uses inter-frame compression to
create a group of I, B, and P-frames. Used for
broadcast transmissions and distribution on
DVD. See also GOP.
MPEG-2 I-frame An MPEG-2
compression type that uses only intra-frame
compression (that is, only I-frames are
created). Used for high-quality distribution
and for archiving.
MPEG HD An HD video recording format
developed by Sony that uses
industry-standard MPEG-2 IBP compression
and supports data rates of 17.5, 25, and
35 Mb/sec. Sony XDCAM HD devices use
MPEG HD compression for video recording.
mV Abbreviation for millivolt
(one-thousandth of a volt). Unit of
measurement sometimes used to define the
amplitude of a video signal. See also IRE
unit.
MXF Material eXchange Format. A file
exchange format standardized by SMPTE that
assures interoperability among devices and
systems. Panasonic P2 (Professional Plug-in)
as well as Sony XDCAM and XDCAM HD
use .mxf files rather than .mov, .avi, or .mpg
files, for example. MXF is designed for
today's file-based workflows and provides a
common way of packaging video and audio
along with metadata so that information about
the content is maintained as it flows through
the production process.
N
nonlinear editing Random access editing
that generally uses video and audio clips
stored on disks. Nonlinear editing programs
let you rearrange and edit clips without