The 4 x 1 HDMI Quad MultiViewer with Rotation, Chromakey, and Audio from Avenview can be used for multiview (quadview), switching, and compositing. If features four HDMI inputs, and allows you to zoom in, rotate, and arrange all four sources in custom configuration within a single SD or HD frame. The multiview feature can be used in surveillance to monitor up to four cameras on one screen, as an accessory to a live video switcher that doesn't provide built-in multiview, or for creative digital signage applications. It can also act as a seamless switcher. Seamless means the image fades to black, and then fades back in during the transition for source A to source B. Finally, the device can be used for compositing and chroma key. In chroma key mode only two of the four inputs will be used, one serves as the foreground element and one the background.
The program video feed is output over a single HDMI port that, in multiview mode, combines all four input sources into a single feed. To configure the multiview arrangement or manually switch between inputs there is an OSD (on screen display) that is accessible using front panel buttons, an Ethernet port for Telnet control, and an RS-232 port.