QuickTime Animation
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QuickTime Animation format (also known as QuickTime RLE) is a video compression format and codec created by Apple Computer to enable playback of RGB video in real time without expensive hardware.[1][2] It is generally found in the QuickTime container with the FourCC "rle ".[note 1] It supports a lossless compression (if encoded at 100% quality) and color depths from 1 to 32 bits, and is one of the few video codecs that supports an alpha channel. As a result of reverse-engineering of the format, a decoder is implemented in XAnim as well as an encoder and decoder in libavcodec.[3][4]
Technical Details
QuickTime Animation uses run-length encoding and conditional replenishment for compression and as such, works well for traditional 2-D animation where there are large areas of constant color, or have little change of pixels frame to frame. For the same reasons, it is well suited for screencast content.[5] For natural video and complex 3D rendered scenes, in which runs of constant color rarely occur, it barely compresses at all and adds visible noise at lower than 100% quality levels.
See also
Notes
- ^ Please note the extra space character at the end.
References
- ^ "QuickTime File Format" (PDF). Inside QuickTime: The QuickTime Technical Reference Library. Apple Inc. 2000. Retrieved 5 April 2013.
- ^ "Apple QuickTime RLE". MultimediaWiki. 24 May 2011. Retrieved 9 April 2013.
- ^ Mark Podlipec (10 December 1997). "xanim.2.70.6.4.2 README". XAnim. Retrieved 4 April 2013.
- ^ "FFmpeg Documentation". FFmpeg. Retrieved 4 April 2013.
- ^ Peter Hosey (08 December 2013). "Screencast codec showdown: The codecs: Animation". Retrieved 9 April 2013.
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External links
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