Difference between revisions of "Accessing Music and Video"
Line 16: | Line 16: | ||
There are two types of codecs: | There are two types of codecs: | ||
− | '''Lossy Codecs | + | '''Lossy Codecs -''' |
Revision as of 21:56, 6 December 2009
Introduction
|
...by studentsHI! |
Codec
A codec is a device or computer program capable of encoding and/or decoding a digital data stream or signal[1]. Codecs are used to encode a data stream or signal for storage, or decoding them for playback and editing. Codecs are a key component of audio and video playback, creation and distribution. In general raw audio and video is far too large for distribution and storage, for instance we need 118 Gb (or about 26 single layer DVDs) to store a raw video 90 minutes in length at VHS quality[2]. To remedy this we use codecs to compress (encode) the data before it is stored or distributed. As a consequence any user who wishes to playback the media must have the same codec to uncompress (decode) the data.
Codec Types
There are two types of codecs:
Lossy Codecs -
Digital Audio
Digital Audio uses digital signals (binary) for reproducing sounds. As such, it is the representation used by modern computers to playback, record, and edit audio.
Audio Playback
Digital Video
Video Playback
Acquiring Media
Further Readings
History of Operating Systems on Wikipedia: http://en.wikipedia.org/wiki/History_of_operating_systems
Computer History Timeline: http://www.computerhistory.org/timeline/?category=sl
Operating System Timeline: http://trillian.randomstuff.org.uk/~stephen/history/timeline-OS.html
Detailed Timeline of Non-UNIX Operating Systems: http://www.oshistory.net/metadot/index.pl?id=2165;isa=Category;op=show
Screenshots of Major Operating Systems: http://www.guidebookgallery.org/guis
References
- ↑ http://en.wikipedia.org/wiki/Codec
- ↑ http://www.fastvideoindexer.com/articles/VideoSizes/VideoSize.htm
Previous Page: Roles of the Operating System |
Next Page: Protecting your Computer |