MPEG-2compression
is based on identifying and eliminating multiple frames of a video sequence.
I-Frame: "Key Frame" or "Index Frame"
- Complete frame, not reliant on other frames.
- apx. 400,000 bits
P-Frame: "Predicted"
- Uses info. from previous frames & from frames yet to come.
- apx. 200,000 bits
B-Frame: "Bi directional"
- Only the differences from previous frame are stored.
- apx. 80,000 bits
A possible frame sequence: BBIBBPBBPBBP