Makes little sense. If the encoder went through the trouble of finding a field prediction in the first place, why select frame organization for the prediction error?
Prediction modes now include field, frame, Dual Prime, and 16×8 MC. The combinations for Main Profile and Simple Profile are shown below. Frame pictures motion_type (transmitted, derived, and total) motion vectors per MB fundamental prediction block size (after half-sample interpolation) interpretation Frame 1, 0, 1 16×16 same as MPEG-1, with possibly different treatment of prediction error via dct_type Field 2, 0, 2 16×8 Two independently coded predictions are made: one for the 8 lines which correspond to the top field lines in the target macroblock, another for the 8 bottom field lines. Dual Prime 1, 1, 2 16×8 Two independently coded predictions are made: one for the 8 lines which correspond to the top field, another for the 8 bottom field lines. The opposite parity prediction is formed based on a second vector derived from the first vector coded in the bitstream. Field Pictures Field 1, 0, 1 16×16 same as MPEG-1, with possibly different treatment of prediction error via dct_type 16x
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