TrueMotion S is a proprietary lossy video compression format and video codec developed by The Duck Company, now known by the name On2 Technologies. It is an early incarnation of the TrueMotion video codec, a series of video codecs developed by On2 Technologies.
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The codec's FourCC is DUCK (or TMOT for a version of TrueMotion S that was licensed by Horizons Technology[1]). It is usually put in an AVI container. The filename extension varies from game to game. Some leave it with .avi, other games use .bin or .duc. The codec is notorious for being used frequently during the 32-bit era of video game consoles. For example the games Bug!, Bug! Too or Fighting Vipers (all Sega Saturn) used this codec for FMV sequences. Nowadays, TrueMotion S is obsolete. Some of the files can be played back with a video player that uses the libavcodec library, such as MPlayer.
In 1995, Horizons Technology Inc. began shipping the TrueMotion-S Compressor software for Macintosh and MS Windows.[2][3] TrueMotion-S was originally developed by the Duck Corp. for applications such as the Sega game box.
In 1996, the main competitors for TrueMotion S software codec were Cinepak and Indeo.[4]
Later incarations of this codec are TrueMotion 2, TrueMotion VP3 and TrueMotion VP5 through VP8.