Format shifting is the conversion of

media file This is a list of file formats used by computers, organized by type. Filename extension it is usually noted in parentheses if they differ from the file format name or abbreviation. Many operating systems do not limit filenames to one extension s ...

s into different

file format A file format is a standard way that information is encoded for storage in a computer file. It specifies how bits are used to encode information in a digital storage medium. File formats may be either proprietary or free. Some file formats ...

data compression In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation. Any particular compression is either lossy or lossless. Lossless compression ...

(

video coding format A video coding format (or sometimes video compression format) is a content representation format for storage or transmission of digital video content (such as in a data file or bitstream). It typically uses a standardized video compression algo ...

and

audio coding format An audio coding format (or sometimes audio compression format) is a content representation format for storage or transmission of digital audio (such as in digital television, digital radio and in audio and video files). Examples of audio coding f ...

). This may be required to play the media on different devices, for example when converting or

ripping Ripping is extracting all or parts of digital content from a container. Originally, it meant to rip music out of Commodore 64 games. Later, the term was used to extract WAV or MP3 format files from digital audio CDs, but got applied as well to ext ...

audio files on CDs into digital formats such as

MP3 MP3 (formally MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) is a coding format for digital audio developed largely by the Fraunhofer Society in Germany, with support from other digital scientists in the United States and elsewhere. Origin ...

. Other media shifting processes include

time shifting In broadcasting, time shifting is the recording of programming to a storage medium to be viewed or listened to after the live broadcasting. Typically, this refers to TV programming but it can also refer to radio shows via podcasts. In recent year ...

(also known as place shifting), a process whereby a radio or television broadcast is recorded to disk storage and played back at a different time, and

space shifting Space shifting (or spaceshifting), also known as place shifting (or placeshifting), allows media, such as music or films, which are stored on one device, to be accessed from another place through another device. Space shifting is frequently done thr ...

where media is stored on one device and can be accessed from another place through another device which is normally located at another location.

Archiving and preservation

Format shifting is central to preservation and archiving, particularly for

sound recordings Sound recording and reproduction is the electrical, Mechanical system, mechanical, electronic, or digital inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. The two main classes of ...

and

films A film also called a movie, motion picture, moving picture, picture, photoplay or (slang) flick is a work of visual art that simulates experiences and otherwise communicates ideas, stories, perceptions, feelings, beauty, or atmosphere ...

. In addition to efforts to preserve works created in deteriorating formats format shifting is also necessary to keep works accessible. As technology develops the technical formats get outdated and the technology necessary for accessing original formats is no longer available.

Copyright law of the United Kingdom Under the law of United Kingdom, a copyright is an intangible property right subsisting in certain qualifying subject-matter. Copyright law is governed by the Copyright, Designs and Patents Act 1988 (the 1988 Act), as amended from time to time. A ...

does not allow libraries and archives to format shift for preservation and archiving purposes. By the time

copyright term The copyright term is the length of time copyright subsists in a work before it passes into the public domain. In most of the world, this length of time is the life of the author plus either 50 or 70 years. Length of copyright Copyright subsists f ...

in a work ends the original work may have disintegrated or deteriorated to such an extent that the cost of preservation increases.

Archiving and preservation

See also

References