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Revision as of 07:24, 12 February 2013 by R1 (talk | contribs) (adjusted the information as the situation changes)
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The Cinepak coding method is a vector quantization scheme with interframe update optimization. It is known to operate most commonly using a modified YUV 4:2:0 colorspace but also supports 256-grayscale mode. A modified variant of this format is used for full motion video on many Sega Saturn games (in Sega FILM files often bearing the .cpk extension). It is not known if this format has anything in common with the Cinepak For Sega format used in many Sega CD games.

ffmpeg contains an almost compliant decoder (using YUV420 instead of the Cinepak colorspace, which distorts colors somewhat - should be easy to fix).

There are several versions of a binary proprietary encoder/decoder as a windows dll, among others

There is also a simple and straightforward open source encoder as a ffmpeg patch, written in 2011 by Tomas Härdin and available at

Unfortunately the open source decoder present in ffmpeg is using the non-compliant YUV420 colorspace instead of the native Cinepak one (for the fix see below).

The encoder mentioned above was adapted for the current (December 2012) ffmpeg, bugfixed and improved for better rate/distortion performance by Rl. The compression speed is barely optimized (it is slow), for simplicity and better r/d. A snapshot 2013-02-12 is at

There is also a patch introducing the correct colorspace for the open source decoder

The encoder was never submitted for inclusion in ffmpeg, feel free to push it upstream.