Stick to Windows 10/11 Pro (LTSC preferred) . While Linux is open source, the exclusive GPU acceleration for NDI/ST2110 tiling is currently superior on Windows DX12.
GStreamer is a pipeline-based multimedia framework. Building a multiviewer means writing a pipeline like compositor to mix video sinks. ip multiviewer software open source exclusive
Let's move from theory to practice. Below is a blueprint for creating a production-grade open source IP multiviewer that outperforms hardware costing 20x as much. Stick to Windows 10/11 Pro (LTSC preferred)