Digital multimedia elements

Audio acastro_180403_1777_youtube_0001.0

Video

Bit resolution

Sampling rate

Is the number of bits used to represent the amplitude of an audio signal.

The higher the number of bits used, the more precise the amplitude of the audio signal will be

The higher of sampling ratw, the better the quality of the digital audio will show

Is the number of samples taken each second during the conversion process

Is measured in Hz

Stereo audio contains two steams of audio signals, known as lee sound track and right sound track

Mono audio contains only one sound track

Audio data can be stored either in uncompressed or compressed format

Uncompressed

Compressed

WAV

WMA

MP3

The file size of it can be very large

Factors affecting the size of a video file

Is a sequence of full-motion images together with sound tracks

Frame rate

Duration

Compression

Colour depth

Frame size

The higher the frame size and frame rate, the better the video quality and the larger the file size

A particular compression method has its own specification of compression ratio, frame sizes and frame rates

Different video file formats require different media players and plug-ins

Video files can be compressed into different video file formats for different playback media

AVI is the most popular standard of uncompressed video

MPEG-1, MPEG-2 and WMV are examples of compressed video file format