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The primary driver behind small file sizes was the transition from older video formats like MPEG-2 and Xvid to newer, highly efficient codecs. The introduction of and eventually H.265 (HEVC) revolutionized compression. These codecs use advanced mathematical algorithms to compress video data without destroying visual clarity. They drastically reduce file sizes by only saving the changes between frames rather than saving every individual frame as a whole image. 2. Resolution Downscaling