Copy spout_ndi_normalizer.exe into your Unity project under Assets/StreamingAssets/SpoutNdiNormalizer/spout_ndi_normalizer.exe. (StreamingAssets is preserved verbatim into builds, so the same path works in Editor and in standalone Player.)
Drop SpoutNdiLauncher.cs anywhere under Assets/.

Add a GameObject (e.g. an empty "SpoutNdiLauncher" object) and attach the SpoutNdiLauncher component. Inspector fields:

Field	Default	Notes
Exe Relative Path	`SpoutNdiNormalizer/spout_ndi_normalizer.exe`	Relative to `StreamingAssets/`
Sender Name	`Streamingle Spout Output`	Must match Unity's KlakSpout / Spout sender exactly
Target Fps	`60`	Output cadence
Monitor Index	`1`	0-based; -1 = start windowed
Window Width/Height	`1280 / 720`	Used only when `monitorIndex < 0`
Vsync	`true`	Toggleable at runtime via `V` key
Skip If Already Running	`true`	Avoid duplicates on PlayMode reload

Press Play. The exe spawns automatically and quits when Unity quits or crashes (uses --parent-pid <unity-pid> watchdog).

Runtime hotkeys (in the normalizer window)

Key	Action
F11	Toggle borderless fullscreen
F12	Cycle target monitor
V	Toggle vsync
T	Toggle always-on-top
C	Toggle cursor hide
P	Dump pace_log.csv next to the exe
ESC	Exit fullscreen, or close window

The window title bar reports live pacing telemetry: pace fps, wake jitter percentiles, tick interval distribution, callback duration, hold ratio, sender format, GPU adapter, and source name.

CLI args (advanced)

The launcher composes these for you, but the exe accepts them directly:

--sender <name>      Spout sender name (default: Streamingle Spout Output)
--fps <hz>           Target output cadence (default: 60)
--width <px>         Initial windowed width
--height <px>        Initial windowed height
--monitor <index>    Borderless fullscreen on this 0-based monitor index
--no-vsync           Free-run present (default: vsync on)
--topmost            Keep window above all other windows
--hide-cursor        Hide cursor while over the render area
--realtime           Aggressive scheduling (TIME_CRITICAL + Pro Audio MMCSS).
                     Default off — only enable for headless render-farm use.
                     Will starve Unity when our window is foreground.
--no-activate        Window cannot take focus on click. Recommended when
                     running alongside Unity Editor — clicks pass through and
                     Unity stays foreground. Disables our runtime hotkeys.
--parent-pid <pid>   Auto-exit if this process dies

Troubleshooting

Title shows NO SOURCE: Unity's Spout sender component hasn't started yet, or its sender name doesn't match. Set the same name in both places.
Title shows wrong GPU: launcher chose the iGPU. Force-pick the dGPU in Windows Graphics Settings → Browse → spout_ndi_normalizer.exe → High performance.
Window doesn't appear: launcher crashed before window creation. Run the exe manually from a console to see stderr messages.
Auto-exit didn't fire: Unity's PID changed mid-session (very unusual). Just kill the orphan from Task Manager; next Unity Play will respawn it.

Build provenance

This binary was produced from spout-ndi-normalizer source, MSVC /MD x64 Release, statically linked against Spout2 SDK. No external DLLs required — the exe is self-contained on Windows 10 1803+ (high-resolution waitable timer requirement).