Noun
P-frame (plural P-frames)
(signal processing, video compression) A video frame which contains only information on the differences from previous frames
P-frames store only the difference in image from the frame (either an I-frame or P-frame) immediately preceding it (this reference frame is also called the anchor frame). Source: Internet
The typical data rate of an I-frame is 1 bit per pixel while that of a P-frame is 0.1 bit per pixel and for a B-frame, 0.015 bit per pixel. Source: Internet
The difference between a P-frame and its anchor frame is calculated using motion vectors on each macroblock of the frame (see below). Source: Internet
A P-frame can contain any number of intra-coded blocks, in addition to any forward-predicted blocks. Source: Internet
However, similarly, the future P-frame must still encode all the changes between it and the previous I- or P- anchor frame. Source: Internet
If this was done with a P-frame, future P-frames would be predicted from it and would lower the quality of the entire sequence. Source: Internet