Black Magic Design ATEM Production Studio 4k w/ "Quiet Mod" $650
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Used in good condition. Modified to have much quieter fan. $650
ATEM Production Studio 4K lets you connect up to 8 SD, HD or Ultra HD 4K video cameras, disk recorders and computers to do true broadcast quality work. You get all the features you expect from a professional switcher including chroma key, transitions, media pool, downstream keyers, audio mixer, multi view and the world's first 6G-SDI and HDMI 4K video connections.
As long as you understand the Black Magic frame rate preferences, this will work well.