H.264 video compression algorithm. For DS-7004HI, Total frame is 100/120FPS (PAL/NTSC) at CIF resolution.60/64 FPS (PAL/NTSC) at 2CIF resolution. 48/52 FPS (PAL/NTSC) at DCIF resolution. 32/36 FPS (PAL/NTSC) at 4CIF resolution. For DS-7008HI, total frame is 200FPS (PAL) or 240FPS (NTSC) at CIF resolution.64/72 FPS (PAL/NTSC) at 2CIF resolution. For DS-7016HI, total frame is 400FPS (PAL) or 480FPS (NTSC) at CIF resolution.128/144 FPS (PAL/NTSC) at 2CIF resolution.