A method and associated apparatus for processing video data are provided. The video data includes a first frame formed by a plurality of macroblocks. The method includes providing a memory, deblocking a first macroblock in the first frame, and writing the deblocked macroblock into the memory. The step of writing the deblocked macroblock lets a plurality of pixel data of the deblocked macroblock to be stored to a first storage space at consecutive addresses in the memory.