A computer readable medium storing a computer pro gram for execution by a processor, the computer program for encoding a video picture comprising a plurality of pixel sets, Wherein each pixel set comprises a plurality of pixels, the computer program comprising sets of instructions for: grouping the plurality of pixel sets into one or more groups, each of said groups comprising one or more pixel sets, at least one of said groups comprising more than one pixel set; assigning, for each particular group of pixel sets, a same single quantizer value to all pixel sets in the particular group based at least on current motion vectors associated With the pixel sets in said particular group; and quantiZing, for each particular group, the pixel sets in the particular group by using the same single assigned quantizer value for each pixel set in the particular group.
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