1. A method for encoding an interlaced video comprising a sequence of alternating TOP and BOT fields, the method comprising: producing a sequence of frames, each frame being determined from at least two consecutive fields, each field forming a region of the frame, encoding each frame of the sequence to produce an encoded video of the sequence of frames; wherein encoding each frame of the sequence comprises, for an inter-predicted part of a frame: determining a prediction part from pixels of a reference frame, determining a representation of a motion vector corresponding to a distance in pixels between a position of the inter-predicted part in the frame and the position of the prediction part in the reference frame, subtracting a pixel offset greater than two pixels from an absolute value of at least one component of the motion vector representation in the case where the pixels from which the prediction part is determined belong to a field, called prediction field, whose parity is different from the parity of the field of the inter-predicted part, producing prediction data comprising the subtraction value and a pixel offset presence indicator.