I-Frames?

[John Rofrano]

Can somebody tell me what I-Frames and B-Frames are in MPEG2 encoding?

An I-Frame is a complete frame. B-Frames and P-Frames are delta and predictive frames from the previous I-Frame. They only contain the changes. This is how MPEG get’s it’s high compression ratios i.e., every frame is not completely saved to the stream.

~jr

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