GOP
A structure that processes frames in video encoding by grouping them into I, P, and B types as a single unit
- I-Frame (Intra-coded Frame): Independent compression, contains all pixel information
- P-Frame (Predictive-coded Frame): Compressed by referencing previous I/P frames
- B-Frame (Bi-predictive-coded Frame): Compressed by referencing both previous and future frames
GOP is structured as "I → (B → … → B → P → …)", where GOP Size represents the number of frames from one I-Frame to the next I-Frame. This structure enables reference prediction, significantly increasing compression ratio.
ffmpeg -g 48