Interframe encoding - frame types
- Typical frame sequence:
I B B P B B P
- I frames - intraframe encoded (`keyframe')
- P frames - based on an I or P frame and extrapolated forward
- B frame - (bidirectional) extrapolated from previous I or P frame and next I or P frame
- B frames tend to be smallest and have the advantage that if the forward frame is I they will reveal hidden areas behind moving blocks
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