Size issue when exporting video

[Elusien]

For a description of the GOP (Group Of Pictures) see the post I made here:

GOP, B Frames and Codec Threads - What Do They Mean?

A GOP (Group Of Pictuires) always starts with an I-frame (Intra frame). An I-frame contains all the information needed to produce the picture for that frame, it does not depend on the contents of any other frame. If the GOP consists of only I-frames it would emulate an old cinematographic spool of tape, where e.g. damage to one frame would not affect any other frame. The GOP can also contain zero or more B-frames (Bi-directional frame). B-frames consist of information that describes the chan…