Blackmagic MultiView 4 HD is a multiviewer that lets you simultaneously monitor 4 completely independent SDI video sources on a single display! You can monitor any combination of SD and HD formats and frame rates. all at the same time. Each view can display overlays with information such as custom labels. audio meters and more. MultiView 4 HD has both SDI and HDMI outputs for monitoring on professional SDI displays. projectors or even big screen televisions!