
A still frame is a single static image (`frame`) taken from a film or video, which are kinetic (moving) images. Still frames are also called freeze frame, still image, video prompt, preview or misleadingly thumbnail, keyframe, poster frame, or screen shot/grab/capture/dump. Freeze frames are widely used on video platforms and in video galleries,.....
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http://en.wikipedia.org/wiki/Still_frame

picture derived from one or more fields, which is stored and which replaces the normal moving picture for a certain period
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=723-04-37
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