vMixRTC — vMix Rust Title Controller

vMixRTC is a cross-platform controller for vMix written entirely in Rust: title/scoreboard widgets, a script engine, data providers, MIDI, Stream Deck and an NDI monitor.

It is a full rewrite of vMixUTC (the original C#/WPF application) — same .vmc controller files, same widget behaviour, but a single Rust codebase with no .NET, no WPF and no Windows-only dependencies.

The C#/WPF original has been removed from this repository. It stays available upstream at elgarf/vMixUTC; this fork continues as the Rust project.

Install

Arch Linux — one command (our own pacman repository, no AUR account needed):

curl -fsSL https://github.com/fursyt12/vMixRTC/releases/download/repo-x86_64/vmixrtc-repo.sh | sudo bash
sudo pacman -S vmixrtc-bin

Prefer to look first? The same installer as a file, plus the manual variant:

curl -fsSLO https://github.com/fursyt12/vMixRTC/releases/download/repo-x86_64/vmixrtc-repo.sh
less vmixrtc-repo.sh      # optional
sudo bash vmixrtc-repo.sh # add the repository, then: sudo pacman -S vmixrtc-bin
sudo bash vmixrtc-repo.sh --remove   # undo everything

The script writes /etc/pacman.d/vmixrtc.conf, adds a single Include = /etc/pacman.d/vmixrtc.conf line to /etc/pacman.conf (after backing it up) and runs pacman -Sy. Doing it by hand is just as fine — append to /etc/pacman.conf:

[vmixrtc]
SigLevel = Optional TrustAll
Server = https://github.com/fursyt12/vMixRTC/releases/download/repo-x86_64

platform	how
Arch Linux	the command above
Arch Linux, from source	cd packaging/arch/vmixrtc && makepkg -si
macOS	.dmg from Releases for Apple Silicon (M1/M2/M3) — see INSTALL-macOS.md
Windows	.msi/.exe from Releases (WebView2 is preinstalled on Windows 10/11)
Linux (other)	.deb or .AppImage from Releases

AUR packages are prepared in packaging/arch/ too (vmixrtc, vmixrtc-bin), but AUR account registration is temporarily closed, so the pacman repository above is the primary way to install on Arch.

Opening controllers

Open in the toolbar asks the system file dialog for a .vmc (extension filter included), so there is no need to type a path; the path field stays available for pasting one directly. Save writes back to the opened file, and for a new document it asks where to save.

What it can do

area	state
.vmc controllers	read/write without losses (verified: read → write → read on all example files)
widgets	region, button, new button, text, score, timer, list, playlist, external data, clock, volume, T-Bar, variable viewer, container, MIDI, Stream Deck
scripts	expressions (_('path'), variables, getvalue/split/len), conditions (Condition/If, Else, ConditionEnd/EndIf), GoTo, Timer/Delay, ExecLink, SetVariable/SetGlobalVariable, ValueChanged, IsPressed, HasVariable, API/APIPOST, page commands, import/export, GUI editor
state	1 Hz polling of the vMix API, per-widget active-state highlighting (ActiveStateXPath)
UI features	autosave on exit, drag & drop .vmc files to open, file dialog for open/save, undo (Ctrl+Z), shortcuts: Ctrl+S / Ctrl+O / Ctrl+D / Ctrl+0, Delete, arrows
data providers	XML, JSON, Excel, Google Sheets, NDI sources, files, HTTP(S) with headers; rows → vMix titles — how-to: docs/DATA.md
NDI	video receive through the NDI runtime (FFI), streamed to the UI as MJPEG
MIDI	midir input, learn mode, mappings to widget links
Stream Deck	direct HID access (no Elgato plugin needed), models, key events, brightness, learn
links	Hotkey.Link dispatch: MIDI, Stream Deck, schedule and other widgets all trigger the same actions
scheduler	clock events: time + weekdays + link, once per day
localization	Russian and English (ui/locales/*.json), switchable at runtime

Platforms

• Linux (x86_64, ARM64), Windows (x86_64), macOS (arm64 for Apple Silicon M1/M2/M3) — desktop.
• Android and iOS — Tauri v2 mobile targets (MIDI/Stream Deck are desktop-only and report that honestly on mobile).

Prebuilt binaries are produced by the CI workflow .github/workflows/rust.yml: Windows .msi/.exe, macOS .dmg (Apple Silicon only), Linux .deb/.AppImage, plus the vmixrtc-cli command-line tool for every platform. Push a tag rust-v0.2.0 (or run the workflow manually) to build and publish a release.

macOS users: see INSTALL-macOS.md — the build is for Apple Silicon (M1/M2/M3); it is ad-hoc signed by default, so the first launch needs the usual Gatekeeper confirmation (the Homebrew cask handles it automatically). Developer ID signing and notarization switch on by themselves once the APPLE_* repository secrets are set.

Build

cargo build --release -p vmixrtc        # GUI
cargo build --release -p vmixrtc-cli    # CLI
cargo test --workspace                  # 129 tests

Everything lives in the repository root: crates/ (the workspace), examples/ (real .vmc controllers) and data/ (the vMix function catalogues). Prerequisites and per-platform instructions (including cross-compilation and mobile) are in BUILD.md. Run the GUI with a controller file:

./target/release/vmixrtc path/to/controller.vmc [widget-index] [script|rows|midi|deck|schedule]

Command line

vmixrtc-cli status                                  # vMix version and state summary
vmixrtc-cli call Cut --param Input=1                # call a vMix function
vmixrtc-cli vmc examples/Scoreboard.vmc             # inspect a controller file
vmixrtc-cli press examples/Scoreboard.vmc 12        # run a widget script without the UI
vmixrtc-cli demo my.vmc --kind clock                # generate a demo controller
vmixrtc-cli verify examples --verbose               # verify the port against real files

Documentation

file	contents
PORTING.md	how the original C# application was ported, module by module
PORTING-GAPS.md	what is not ported yet, and what to replace it with
PORTING-VERIFY.md	how the port is verified (round-trip, catalogue checks, tests)
BUILD.md	build and cross-compilation instructions

Documentation

• docs/DATA.md — data sources: Google Sheets, Excel, HTTP API, XML, JSON, NDI and hand-written list items.
• BUILD.md — building on Linux/macOS/Windows/mobile, icons, packaging.
• branding/ — logo, icon and the brand sheet (palette, typography, usage rules); python3 branding/generate-icons.py regenerates every app icon from the SVG sources.
• INSTALL-macOS.md — macOS install and Gatekeeper.
• packaging/arch/README.md — Arch packages and the pacman repository.

Verification

./target/release/vmixrtc-cli verify examples --verbose

Reports, for every example controller, whether the file survives a read/write round trip and whether every widget type, command and provider is recognized: currently 6 files, 57 widgets, 45 commands, 0 problems.

License and origins

vMixRTC is released under the MIT License: © 2026 fursyt12.

This is a fork of vMixUTC by elgarf; the original C#/WPF code was removed from this repository and the Rust rewrite is the project. The upstream repository carries no license file, so if you intend to redistribute the upstream work, check its terms with the upstream author.