SOURCE

Brings external video into the chain, from a file, a live capture device, or another program’s NDI/Spout/Syphon output.

Parameter	Control	Notes
Input	Selector	Video File, Camera / Capture, NDI In, Spout In (Windows only), Syphon In (macOS only).
Fit Mode	Selector	How the incoming frame’s aspect ratio maps onto the canvas, for every Input kind. Fit letterboxes or pillarboxes with no crop. Crop fills the canvas and crops the overflow. Stretch distorts aspect to fill exactly. Native centers the frame at its exact original pixel size with no scaling.
File / Device	file picker, text field	Meaning depends on Input: a file path for Video File, an OS capture handle for Camera / Capture, or a sender/server name to connect to for NDI/Spout/Syphon In.
Loop	Rocker	File input only.
Speed	Trough	0 to 4.0x. At 0 the value field reads Pause. Playback is forward only; there is no reverse.
Blend	Selector	Add, Multiply, Screen, Difference, XOR, Replace, or Phoenix into the chain.
Mix	Trough	Wet/dry of the source against what’s beneath it.

Related: Insert FX Chains, AUX Sends and Buses.