https://www.sparcsigns.com/
SPARC digital signage software controls video walls, LED displays & multi-screen installations. Real-time sync, remote management. Australian-built.
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https://www.cnx-software.com/2011/03/09/video-wall-with-beagleboards-and-ffmpeg/
There was a 6-Screen Video Wall at Embedded World 2011, powered by 6 Beagleboard xM (based on Texas Instruments OMAP 3 running @ 1Ghz - Cost: 149 USD /
video wallffmpegcnxsoftware