>> I'm not really comprehending the significance of the distinction 
>> between P frames and B frames...
> 
> P frames are differences from the previous I frame.
> 
> B frames are differences from the preceding and following frames, 
> whether they be I or P or B.
> 
> In other words, you can't play a B frame at all without all the data 
> between one I frame and the next.

I get that there are full frames and difference frames. I'm just not 
really understanding why there are two different kinds of difference 
frames...

> Ever try to skip forward and back in a youtube video? Those jumps 
> *there* are the I frames (or whatever equivalent).

Yeah, I figured that out a long time ago. ;-) Presumably otherwise you'd 
only have one I frame, right at the very start.

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