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Thursday 3 February LO:to create a realistic green screened clip using movie CGI movie is a proprietary video file format associated with Silicon Graphics products , including IRIX. Other names for it include SGI video and mv. The format was supported by programs named movie-player, capture, and others. Special effects include mechanical effects —such as pyrotechnics, miniatures, and prosthetic makeup—and optical effects, such as motion-capture photography, matte paintings, and stop-motion animation.