What are MPEG I, P and B frames?

Posted by Fasih Khatib on Programmers See other posts from Programmers or by Fasih Khatib
Published on 2012-09-23T12:34:19Z Indexed on 2012/09/23 15:49 UTC
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video

I was recently going over MPEG articles and videos to understand how it works. I understand what I, P and B frames do but I do not understand how the prediction is calculated.
Assume that I want to record a video of a ball falling from the sky to the ground and then bouncing a couple of times before finally coming to a halt.
Also, I am not clear with the concept of the 16x16 macroblock. Please tell me:

how prediction is calulated

what is macroblock and how it helps in MPEG encoding

My references:

MPEG Prediction

Video on MPEG conversion

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