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digital multimedia elements - Coggle Diagram
digital multimedia elements
video
Is a sequence of full-motion images together with sound tracks
The file size of it can be very large
Factors affecting the size of a video file
frame size
frame rate
duration
compression
colour depth
A particular compression method has its own specification of
compression ratios, frame sizes and frame rates.
The higher the frame size and frame rate, the better the video quality
and the larger the file size.
Different video file formats require different media players and plug-ins
AVI is the most popular standard of uncompressed video.
MPEG-1, MPEG-2 and WMV are examples of compressed video file formats
Video files can be compressed into different video file formats for different playback
media
audio
Audio files in a computer are the digitized data of music,speech and any kind of audio signals.
the quality of a digital audio determined by its bit resolution and samply rate
bit resolution
it the number of bits used to represent the amplitude of an audio signal
The higher the number of bits used, the more prease the
amplitude of the audio signal will be
sampling rate
Is the number of samples taken each second during the conversion process
Is measured in Hz
the higher the sampling rate, the better the quality of the digital audio will be
stereo audio contains two audio contains two streams of audio signals, known as left sound track and right sound track
mono audio contains only one sound track.
Audio data can be stored either in uncompressed or compressed format.
WAV is the most popular type of uncompressed audio file format.
WMA and MP3 are examples of compressed audio widely used in
portable music players and web pages.
graphics