log2 of the size of the block which a single vector in motion_val represents: (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
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log2 of the size of the block which a single vector in motion_val represents: (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)