P frame: Short for predictive frame, or predicted frame, a video compression method used by the MPEG standard. In a motion sequence, individual frames of pictures are grouped together (called a group of pictures, or GOP) and played back so that the viewer registers the video’s spatial motion. P‐frames follow I‐frames and contain only the data that have changed from the preceding I‐frame (such as color or content changes). Because of this, P‐frames depend on the I‐frames to fill in most of the data.