VideoMap
VideoMap[f,video] applies f to partial video and audio data corresponding to one frame of video, returning a new video.
VideoMap[f,video,n] applies f to data corresponding to overlapping partitions of n video frames.
VideoMap[f,video,n,d] applies f to partitions with offset d.
VideoMap[f,{video1,video2,…},…] applies f to a list of inputs extracted from each videoi.
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