<
graphics> Moving images stored as a sequence of {static
images} (called "frames") representing snapshots of the scene,
taken at regularly spaced time intervals, e.g 50 frames per
second. Apart from the frame rate, other important properties
of a
video are the
resolution and
colour depth of the
individual images.
Video data is typically stored and transmitted in a format
that includes synchoronised
sound.
The many file formats in use for
video differ chiefly in the
type of
compression used. Compression is even more
important for
video that for static images due to the large
amount of data involved in even a short
video. Furthermore,
compression allows
video to be transmitted via a channel whose
bandwidth is less than the raw data rate implied by the
resolution and frame rate. This allows the recipient to start
displaying the
video before the transmission is complete, a
process known as
streaming.
(2008-05-23)