"The HD7 can output in two different 1080i formats. The first, 1920x1080, dubbed "FHD" for "Full HD," uses variable bit rate compression for a theoretically better picture. The second, 1440x1080, dubbed "1440 CBR" uses constant bit rate compression, and is the HD format you must use if you wish to edit your video with iMovie; iMovie doesn't speak FHD"