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Launch OBS - Instant Replay auto-connects

Instant Replay connects to OBS via WebSocket on port 4455 automatically. No manual config needed. Look for the Instant Replay icon in your system tray (Windows) or menu bar (macOS) - blue means connected.

If the icon is grey:

OBS → Tools → WebSocket Server Settings → Enable on port 4455

Add the Instant Replay browser dock

The viewer lives inside OBS as a custom browser dock. Open:

View → Docks → Custom Browser Docks…

Add this URL:

http://localhost:8080/viewer.html

Drag it wherever you like - right-side panel is most common for broadcast setups.

Create the replay scene + media source

Instant Replay needs a dedicated OBS scene and media source. Default names - customizable in Settings:

• Scene name: InstantReplay
• Media source: VideoReplay (leave it empty - IR controls it automatically)

Enable replay buffer + hotkey

OBS continuously records the last N seconds. Instant Replay watches that folder for new clips.

1. OBS → File → Settings → Output → Replay Buffer
2. Check Enable Replay Buffer, set duration (30–60s typical for boxing/MMA)
3. OBS Keyboard Shortcuts → find "Save Replay Buffer" → assign a key (e.g. Alt+R)

In the Instant Replay dock, open Settings → Hotkeys

Click any action (Play, Stop, Frame Step, Speed Delta, etc.) and press a key combo. F13, F14, F15, F16, F17, F18, F19 are recommended.

In the Elgato Stream Deck app, add a Hotkey action

Drag "System → Hotkey" onto a button. Click into the Hotkey field and press the same F13 (or whatever) you mapped in Instant Replay.

Customize the button icon and label. That's it.

Map any of these actions to a Stream Deck button