> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fabl.studio/llms.txt
> Use this file to discover all available pages before exploring further.

# vMix

> Control vMix live production software — program and preview inputs, transitions, overlays, recording, streaming, and per-input playback — with live state and triggers.

The **vMix** device controls vMix live production software over its TCP API.

## Connection

The agent connects to vMix's TCP API. Provide the **host** and, if needed, adjust the API **port** (commonly **8099**). You can also set a **local media path** and a **device-side media path** so file references resolve correctly between Fabl and the vMix machine.

## Commands

The vMix device supports a broad set of operations, including:

* Set the **active (program)** input and the **preview** input
* **Cut** and **transition**
* **Fade to black**
* Control **overlays**
* Start and stop **recording** and **streaming**, and toggle **external** output and **fullscreen**
* Per-input playback controls such as play, pause, seek, loop, volume, mute, and gain

## State and triggers

The device reports its connection state and raises triggers your [rules](/automation/rules) can react to, including:

* Input active, preview, and playing changes
* Overlay changes
* Recording, streaming, external output, and fullscreen changes

Trigger data such as the input number and name is available for use in rule actions.