CODEWITHSUNDEEP
videopredictionmotionmpeg
Hanz0
Hanz0

Reputation: 59

Computation of B-Frames in MPEG video coding

I've been studying methods in reducing temporal redundancies in video compression and about the main concepts in MPEG video compression. I understand that I-frames are stored in similar way as JPEG compression and P-frames are computed as predicted motion vectors and the prediction error between the frame to be compressed and the motion predicted version of the frame.

My question is: how B-frames are computed and stored? Every search that I've made describes it as "motion vectors and transform coefficients" and they are "predicted or interpolated from an earlier and/or later frame". I know that two motion vectors are computed for each macroblock, but how I use them? Are these vectors coded and transmitted as in the case of a P-frame? The prediction error of the b-frame is between which estimatives?

Upvotes: 4

Views: 1173

Answers (1)

nifCody
nifCody

Reputation: 2444

The B-frames are both, forward predicted and backward predicted from the last/next I-frame or P-frame

The following picture describe how it going to predict. enter image description here

Upvotes: 3

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