User:Trevj/Replay (software)
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| Original author(s) | Sophie Wilson |
|---|---|
| Initial release | 1992 |
| Operating system | RISC OS |
| Type | Multimedia framework |
| License | Proprietary freeware |
In computing, Replay is a multimedia framework[1] developed by Acorn Computers, capable of handling various formats of digital video, picture and audio under RISC OS. It was written by Sophie Wilson and released in 1992 for the Acorn Archimedes.
The software allows RISC OS computers to play videos on the desktop or full-screen. When reported on by Jack Schofield in The Guardian in 1992, it was described as "the highlight" of the recent BETT exhibition. He added that it "looks better than QuickTime".[2]
Features
[edit]Replay uses software decoding to render a 160x128 film at 25fps (ARM3) or 12.5fps (ARM2).[3] Audio capability is for stereo sound of multiple channels.[4]
Support for the file format was included before launch in packages such as Magpie and Genesis.[4]
Components
[edit]![[icon]](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Wiki_letter_w_cropped.svg/40px-Wiki_letter_w_cropped.svg.png){kind=small} | This section needs expansion. You can help by adding to it. (October 2013) |
Files can be played via !ARPlayer, a standard desktop application which installs itself on the icon bar.[5] The playback of audio alone is facilitated via !MultiSound, and the software's codecs are available as system resources via !ARMovie.[5]
ARPlayer
[edit] | This section is empty. You can help by adding to it. (October 2013) |
ARMovie
[edit] | This section is empty. You can help by adding to it. (October 2013) |
MultiSound
[edit] | This section is empty. You can help by adding to it. (October 2013) |
Development
[edit]Work by Acorn on Replay 3 was reported in January 1996.[6]
Codec
[edit]Use of the codecs for video capture with Irlam Instruments' Replay DIY expansion card typically result in one minute of raw video (around 37MB) being compressed to 5MB.[7] The compression system used facilitates 25fps from hard discs and 12.5fps from slower media such as floppy disks and CD-ROMs.[4] An 800k floppy disk could typically store 12 seconds of compressed video at 12.5fps.[4]
The compression process employs lossy compression on each sprite, as individual frames. Delta encoding is then employed to remove further unneeded data.[4]
References
[edit]- ^ IEEE Computer Society (1997). Proceedings, IEEE Compcon 97: San Jose, California, February 23-26, 1997. IEEE Computer Society Press. p. 128. ISBN 978-0-8186-7805-9.
- ^ "News in brief". Acorn User. No. 117. April 1992. p. 16. Retrieved 29 October 2013.
- ^ R. I. Damper; W. Hall; J. W. Richards (1994). Multimedia technologies and future applications. Pentech Press. p. 90. ISBN 978-0-7273-1320-1.
- ^ a b c d e James, Paul (April 1992). "Action Replay". Acorn User. No. 117. p. 103. Retrieved 29 October 2013.
- ^ a b Acorn Replay CD-ROM Demonstration Disc (1992) (CD-ROM). Acorn Computers. 1992.
- ^ "Acorn model range tweaked". Acorn User. No. 164. Janury 1996. p. 11. Retrieved 29 October 2013.
{{cite news}}: Check date values in:|date=(help) - ^ Screen Digest. Screen Digest Limited. 1993. p. 65.
External links
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