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#8 | |
Blu-ray Count
Jul 2007
Montreal, Canada
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![]() Quote:
P-frame = Predicted frame B-frame = Bi-directional frame assuming you meant more then just the words, I frame = whole frame (i.e. like the pictures that make up the film a P frame and B frame are almost the same thing, a P frame uses the previous frame and only tells the video processor what to change, to get the new one, and B frame will also have info on the next one. for example let's say we have the three frames of a film of a guy walking F1=upright, F2 = leg bends to take step and F3 is the guy after the step F1 ![]() | | F2 ![]() | |> F3 ![]() | /\ if F2 is an I frame it would have the whole image ![]() | |> or 1.1= ![]() 2.1 = | 3.1 = | 3.2 = > if F2 is a P-frame it will only have add > to third row of F1 i.e. 3.2 = > if F2 is a B frame then add > to third row of F1; replace |> by /\ for row 3 for F3 i.e. 3.2 = > 3.1=/ 3.2=\ so your decoder = gets F1 ![]() | | then it uses the info in the P or B frame to make F2 but it can make a mistake and get ![]() | | > or ![]() | > which will cause drift and jitter that is why you need i frames every so often (to correct the decompressing artefacts caused by miscalculations) but (to make it simple and go back to the initial discussion F2 as a P frame would only need info on that one element (right leg) while if it is an I frame it would need 4. So a lot more info would be needed to have an I frame then a P (or B) frame, and the encoder will decide to use I, P or B depending on what is allowed and what is most compressible. That is why I frames end up being extremely compressed and why videos use P and B frames to get reasonable BW. now why P and B? P are good for play but B is needed for stuff like reverse (ergo the name bi-directional) |
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