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Compressed movie is downscaled spatially in a multiple of 2 in both horizontal and vertical directions
Four macroblocks are combined and downscaled to the size of one macroblock
Much more complicated than requantization
Transcoding Algorithms Buffer Frames Reconstruction Downscaling Reconstruction of Motion Vectors Reconstruction of Prediction Residual Reconstruction of macroblocks Original frame downscaled frame General Block Diagram of Spatial Downscaling