What is "GOP"?

GOP (Group of Pictures) is a MPEG compression technology. GOP concept reduces the temporal redundancy across frames (from frame to frame) for video content. There are three types of frames involved in the GOP concept:

*I-Frame (Intra pictures): I-frame is typically the first frame of each GOP, is moderately compressed, and serves as the reference points for random access and can be likened to images.

*P-Frame (Predicted pictures): P-frames are coded with reference to past pictures, predict in a forward direction and significantly compressed.

*B-Frame (Bi-directional pictures): B-frames!| predictions are forward, backward and bi-directional, which is relative to the other I-frames and P-frames. Compression is at a high level.