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A progressive format that uses a 1920x1080 display resolution, combined with a number of frames per second, to create a series of still images. Designated as 1080p(n) with "n" being frames per second. ATSC standards for United States HDTV originally supported 1080p24, 1080p25, and 1080p30 video (as well as pull-down of 23.976 and drop-frame 29.97 frames per second. ATSC standards were amended in 2008 to include 1080p50 and 1080p60 (and the drop-frame option of 1080p59.94) as well as H.264/MPEG-4 AVC (ISO/IEC 14496-10) compression, with these higher frame rates requiring High Profile Level 4.2 of AVC/H.264/MPEG-4 Part 10) encoding.