Short for bi-directional frame
, or bi-directional predictive 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. As the name suggests, B-frames rely on the frames preceding and following them. B-frames contain only the data that have changed from the preceding frame or are different from the data in the very next frame.
P-frames and B-frames are also referred to as delta frames.
Also see P-frame and I-frame.