video 音标拼音: [v'ɪdio]
n .
U 电视,视频;录像
a . 电视的,视频的;录像的
U 电视,视频;录像电视的,视频的;录像的
video 视 视频
video n 1 :
the visible part of a television transmission ; "
they could still receive the sound but the picture was gone " [
synonym :
{
video }, {
picture }]
2 :
a recording of both the visual and audible components (
especially one containing a recording of a movie or television program ) [
synonym : {
video recording }, {
video }]
3 : (
computer science )
the appearance of text and graphics on a video display 4 :
broadcasting visual images of stationary or moving objects ;
"
she is a star of screen and video "; "
Television is a medium because it is neither rare nor well done " -
Ernie Kovacs [
synonym : {
television }, {
telecasting }, {
TV }, {
video }]
Moving images presented 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 .
Digital video data is typically stored and transmitted in a
format like {MPEG } or {H .264 } that includes synchoronised
sound }.
Unlike broadcast {television }, digital video on a computer or
network uses {compression }. 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 }.
Compression can be relatively slow but decompression is done
in {real -time } with the picture quality and {frame rate }
varying with the processing power available and the size and
scaling of the picture .
There are many types of software for displaying video on
computers including {Windows Media Player } from {Microsoft },
QuickTime } from {Apple Computer }, {DivX }, {VLC }, {RealPlayer }
and {Acorn Computers }' {Replay }.
2011 -01 -04 )
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