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long GOP compression

(long Group Of Pictures compression) The interframe coding of digital video in which a full video frame (the "keyframe") is followed by a number of delta frames ("difference frames") until the next keyframe is reached. See interframe coding.



interframe coding

In video compression, encoding the differences between frames rather than each full frame. Interframe coding often provides substantial compression because in many motion sequences, only a small percentage of the pixels are actually different from one frame to another. However, it depends entirely on the content. A room full of people dancing will compress less than a person sitting in a chair talking.

Also called "temporal compression," interframe coding creates "keyframes" that do contain the entire image. However, in between the keyframes are delta frames, which are encoded with only the incremental differences. Depending on the interframe method, a new keyframe is generated based on either a set number of frames or when a certain percentage of pixels in the material has changed.

Not So Great for Editing
Although compression ratios can be very high with interframe recording, changing the content after it is recorded may yield less than desirable results. For example, in professional broadcasting, the captured video is often edited substantially, and videographers often choose intraframe (in-tra) coding rather than interframe (in-ter) for better results. See intraframe coding.




Inter Vs. Intra
Interframe coding stores more frames in the same storage space than does intraframe, but subsequent editing can be problematic. Interframe coding is also called "long GOP" (long group of pictures).






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