Input Viewer

A lightweight video input viewer — OBS without the complexity. View and manage capture card feeds with a clean, simple interface designed for users who need to display video inputs without the overhead of full streaming software.

Download

Download the latest release for your platform:

• macOS: Input Viewer.dmg
• Windows: Input Viewer Setup.exe

The app includes auto-updates and will notify you when new versions are available.

Features

• Multi-input display — View one or two video feeds side by side
• Layout switching — Dual view or single feed centered
• Direct input selection — Number keys 1-4 to switch inputs instantly
• Freeze frame — Pause any feed with Space key
• Settings panel — Configure inputs with toggle switches
• No-signal detection — Custom overlay when source disconnects
• DVD screensaver — Bouncing logo when feeds lose signal
• Fullscreen support — Designed for dedicated display setups
• Auto-updater — Automatic updates from GitHub releases
• Any capture card — Works with any video capture device

Keyboard Shortcuts

Key	Action
D	Dual view (both feeds)
S	Single view (selected feed centered)
1-4	Select input directly
Space	Freeze/unfreeze current feed
F11 / F	Toggle fullscreen
Escape	Exit fullscreen
Q	Quit

Hover over the top edge to reveal the settings dropdown panel.

Configuration

Settings Panel

Click the ⚙ gear icon to open the settings panel:

• Toggle inputs on/off
• Set default input (shown at startup)
• Rename inputs for easy identification
• Adjust center gap between feeds
• Adjust border width on sides
• Changes are saved automatically

settings.json

Settings are stored in the app's user data directory:

{
  "inputs": [
    {"index": 0, "name": "Laptop", "enabled": true, "default": true},
    {"index": 1, "name": "Desktop", "enabled": true, "default": false},
    {"index": 2, "name": "Input 3", "enabled": false, "default": false},
    {"index": 3, "name": "Input 4", "enabled": false, "default": false}
  ],
  "centerGap": 100,
  "borderWidth": 50
}

Development

Prerequisites

• Node.js 20+
• npm

Setup

cd input_viewer_electron
npm install
npm run dev     # Development mode with hot reload
npm run build   # Build for production

Building Installers

npm run build:mac   # Build macOS DMG
npm run build:win   # Build Windows installer

Hardware

Works with:

• Any capture card — USB or PCIe capture devices
• Any display — Adapts to your screen resolution
• Platforms: macOS, Windows

Legacy Python Version

The original Python implementation is available in input_viewer_python/ but is no longer maintained. Use the Electron version for the best experience.

License

MIT License © 2025 LAB271