1080i - A resolution specification used for HDTV. 1080i stands for a resolution of 1920x1080 pixels. The "i" means that the video is being interlaced.
480p - Progressive scanning, the option ("p" = progressive), creates a picture signal with double the scan lines of a conventional interlaced picture, 480i ("i" = interlaced), to create a noticeably sharper image. The 480p image offers higher picture resolution and eliminates virtually all motion artifacts in a 640x480 pixel resolution setting.
720p - A resolution specification used for HDTV. 720p stands for resolution of 1280x720 pixels. The "p" means that the video is in progressive format.
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