Using SongShow Plus with a Blackmagic Design DeckLink card gives you the capability to render true text-over-live video without frame lag. Unlike using traditional key techniques like chroma key and luma key, this technology provides genuine alpha-blending that results in superior font smoothing, impressive soft-blurred shadows, and crisp blacks.
Overlay Using a Video Switcher
You can use the DeckLink video card's capability to output two separate video signals, one for color, and one for key. The key signal is a grayscale output that tells a compatible switcher how to blend the color signal over the live video. This is a good solution if you already have a multi-camera IMAG system in place.
Overlay Using a PC
You can also use the DeckLink video card's capability to overlay the color and key signals directly within the video card itself. This solution does not require a separate video switcher, so it's a good option if you are using a single camera IMAG system. This is also a good option if your video switcher does not support the input of a separate key signal.
Using a DeckLink video card is scenario for those who wish to using SongShow Plus to render text and graphics over live video in a way that avoids the latency issues of USB and Firewire capture devices. This scenario is advanced and requires knowledge of video systems beyond the typical computer/switcher/projector configurations. We highly recommend that you consider using one of the turn-key pre-configured GoFishMedia ProKey systems that provide this capability as well as video capture and streaming functions.