1. A method of animating a sprite in a video production comprising a plurality of video frames, said method comprising the steps of: selecting, in one of said video frames, a feature with which the sprite is to be composited; applying a feature tracking process to the video production to thereby output, for a series of said plurality of video frames containing the feature, a temporal-spatial record for the feature; and compositing, dependent upon the temporal-spatial record, to each frame of the series of video frames, a corresponding instantiation of the sprite.