From the ATEM switcher control panel keyer settings, these two inputs can be selected as Key and Fill to complete the process. The SDI and HDMI outputs let you connect to any television or monitor and automatically detect and switch between all video formats. These can then be connected to two spare inputs on an ATEM switcher. The Key + Fill outputs will be sent over SDI 1 and SDI 2 (or SDI A / SDI B) respectively. As you can see you can thus have maximum 4 inputs and 4 outputs. (This is also known as Linear) Premultiplied : Same as Straight except the Fill channel will be "Premultiplied" check with the receiving device documentation to determine which of these options should be selected. Straight: Output two channels over the device, Key + Fill on separate SDI ports. None: No alpha channel, send the video output to the device as normal. When selecting a supported device in External Output settings in vMix, an Alpha Channel dropdown box will appear as shown below: Media Express, Disk Speed Test, LiveKey, Blackmagic Desktop Video Utility and. To group together SDI ports 1 and 2 as shown below: SD/HD/3G-SDI Input/Output PCI-E Interface 1080p 4:4:4 by Single-Link 3G. When using the Decklink Duo 2 or the Decklink Quad 2, port 1 will need to be configured in the Blackmagic Desktop Video Utility
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