QuickTime Animation
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QuickTime Animation format (also known as QuickTime RLE) is a
ARGB, as well as palettized RGB. 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
PCM mode, the color of each pixel is written to the bitstream, without any compression.[2]
Run-length encoding works well on content with large areas of constant color. Conditional replenishment works well if only small areas change from frame to frame. QuickTime Animation works well on content with both these properties, such as traditional 2-D animation and screencast content.[5] For natural video and complex 3D rendered scenes, in which runs of constant color rarely occur, only low compression ratios can be achieved in lossless mode, and the merging of runs becomes visible as noise in lossy mode.
See also
Notes
- ^ Three letters followed by a space.
References
- ^ "QuickTime File Format" (PDF). Inside QuickTime: The QuickTime Technical Reference Library. Apple Inc. 2000. Archived from the original (PDF) on March 7, 2000. Retrieved 5 April 2013.
- ^ a b c d e "Apple QuickTime RLE". MultimediaWiki. 24 May 2011. Retrieved 9 April 2013.
- ^ Mark Podlipec (10 December 1997). "xanim.2.70.6.4.2 README". XAnim. Archived from the original on 28 December 2015. Retrieved 4 April 2013.
- ^ "FFmpeg Documentation". FFmpeg. Retrieved 4 April 2013.
- ^ Peter Hosey (8 December 2013). "Screencast codec showdown: The codecs: Animation". Archived from the original on 3 July 2013. Retrieved 9 April 2013.
External links
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