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For a sports event control room, we saw the National Games project with video wall:

Is the video wall processor mainly for splicing, or also for multi-source preview and layout switching?
It does both, but its core job is splicing — arranging multiple sources across a video wall.
The Modular Seamless Switching Videowall Processor (8×8 up to 144×144) also supports a dedicated preview output for the operator to monitor and set up sources before sending them to the wall, plus layout switching so you can recall different multi-source arrangements instantly. For a sports control room like the National Games project, that preview-plus-layout capability is just as important as the splicing itself.