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What it does

R1 Playout Clock for Mitti turns Mitti's OSC stream into a giant playout countdown for the entire live event production team. Director, TD, A1, stage manager, lighting — everyone watching multi-view stays in sync on every cue, with yellow/red warning colors as the clock runs out. Nobody has to ask "how long is this?" over comms.

The app is dual-purpose by design — pick the path that fits your show, or use both simultaneously:

• NDI^® over the network — broadcasts a 1920×1080 progressive Full NDI^® source on your local network — uncompressed BGRA, not NDI HX. Picked up directly by NDI-capable software switchers (vMix, OBS, NDI Studio Monitor) and NDI-native AV systems, or via NDI-to-SDI converters (BirdDog, Kiloview, AJA) into your favourite hi-res switcher — Barco E2 / S3, Spyder X80, PixelHue Q8 / F4 / F8, etc. Configurable source name and frame rate (broadcast standards from 23.976 to 60p), plus an independent clock-size control optimized for the NDI feed.
• HDMI from the Mac — run the clock app full-screen on a second display and plug that HDMI straight into your favourite hi-res switcher or any HDMI-capable monitor wall. No network configuration at all. Same clock as the NDI feed; independent size control so you can tune the operator window without affecting the NDI output.
• OSC forwarder — Mitti can only feed one OSC destination, so the app acts as a transparent splitter: it parses Mitti's OSC for the clock display and re-broadcasts the same packets to a downstream listener like Bitfocus Companion. Status display shows packet count and any forwarding errors.
• Now-playing pill — small ▶ pill below the time fields shows the current cue name, on every output (HDMI window, NDI feed, second display). Helps the production team see what's playing, not just how much longer.

User guide

Step-by-step setup, settings reference, and troubleshooting are on the user guide page.

System requirements

• macOS 13 (Ventura) or later · Apple Silicon (M1/M2/M3/M4); or Windows 11 (64-bit). Tested on M1 macOS 15.7 and Windows 11.
• Trial builds are not code-signed. On Windows, SmartScreen will prompt on first launch — click "More info → Run anyway" to continue.
• Mitti, configured to send OSC to the clock
• For the HDMI output path: a second display or capture input on your hi-res switcher (Barco, Spyder, PixelHue, or any HDMI-capable input)
• For the NDI output path: a Full NDI receiver on the same network — free NDI Tools, OBS with the obs-ndi plugin, vMix, or any other NDI-capable application; or an NDI-to-SDI converter (BirdDog, Kiloview, AJA) into your switcher of choice. Both Full NDI and NDI HX receivers can ingest this Full NDI source.
• Internet connection on first launch (one-time setup)

Access

R1 Playout Clock for Mitti is currently in private testing. Access is by request — drop us a line and we'll send you a 30-day trial build along with setup instructions.

Terms of Use

Use of R1 Playout Clock for Mitti is subject to the R1 Apps Terms of Use. In short: as-is, no warranty, not for safety-critical use.

Privacy

R1 Playout Clock for Mitti does not phone home, collect telemetry, or transmit any data to R1 Apps. The only network traffic is the OSC packets it receives from Mitti on the port you configure. See our Privacy statement for details.

Open-source acknowledgements

R1 Playout Clock for Mitti is built on top of open-source software. The following components are used; their original licenses apply. License text for each is available at the linked source repository.

• Wails v2

  MIT License · github.com/wailsapp/wails

  Cross-platform desktop application framework. Provides the native window, menu bar, and Go ↔ frontend bridge.

• go-osc

  MIT License · github.com/hypebeast/go-osc

  OSC UDP message parsing and dispatch.

• pkg/errors

  BSD 2-Clause License · github.com/pkg/errors

  Error wrapping with stack traces. Used by Wails internally.

• uniseg

  MIT License · github.com/rivo/uniseg

  Unicode text segmentation. Used by Wails for correct text handling.

• go-ansi-parser

  MIT License · github.com/leaanthony/go-ansi-parser

  ANSI escape code parser. Used by Wails for terminal output formatting.

• slicer

  MIT License · github.com/leaanthony/slicer

  Slice utility helpers. Used by Wails internally.

• u

  MIT License · github.com/leaanthony/u

  Optional/unset value helpers. Used by Wails internally.

• Go standard library

  BSD 3-Clause License · go.dev

  The Go programming language and its standard library, used throughout the app.

Third-party trademarks

Mitti is a trademark of Imimot SARL. NDI^® is a registered trademark of Vizrt NDI AB. Bitfocus Companion is a trademark of Bitfocus AS. R1 Apps is not affiliated with, endorsed by, or sponsored by Imimot, Vizrt NDI AB, or Bitfocus. R1 Playout Clock for Mitti is an independent third-party tool.

Support

Trial users get direct support during the testing period — just reply to the email we send you. For other questions, see our contact page.