The Canon EOS-1D X is an 18.1 effective megapixels full-frame DSLR. The camera is capable of acquiring video at HD resolution (1,920 × 1,080 pixels) at frame rates of 24, 25 and 30 fps or 720p (1,280 × 720) at 50 or 60 fps, and SDTV (640 × 480) at 25 or 30 fps. The h.264 video can be switched between all inter frame and IPB with bidirectional prediction to reduce file size. The EOS-1D X has two DIGIC 5+ image processors for sensor reading and compression, and a separate DIGIC 4 dedicated to automatic exposure. It was officially released on 20 June 2012. Like the Canon EOS 5D Mark III and Canon EOS-1D C, the camera features 61 autofocus points, which are assisted by a 100,000-pixel metering sensor.