Synclay

Multi-camera action sports PiP video sync & combine tool.

Visit the Synclay website for downloads, screenshots, and roadmap.

Overview

Synclay automatically synchronizes and combines footage from multiple action cameras into picture-in-picture (PiP) videos. Designed for action sports enthusiasts, Synclay eliminates the need for complex NLE software by detecting audio-based sync offsets and providing intuitive PiP positioning controls for quick multi-angle video creation.

Features

• Automatic audio sync detection via cross-correlation analysis
• Picture-in-picture compositing with drag, resize, crop, and border controls
• Real-time synchronized dual-video preview
• FFmpeg-powered export with quality presets
• File watching with auto-detection of video pairs by session time

Tech Stack

Frontend:

• React 18 + TypeScript
• Vite

Backend:

• Tauri 2.0
• Rust
• FFmpeg
• Python sidecar (scipy)

Platform:

• macOS (Apple Silicon primary)
• Windows (64-bit x86_64)

Getting Started

Prerequisites:

macOS:

• macOS 11+ (Apple Silicon recommended)
• Node.js 18+
• Rust toolchain
• Python 3 with scipy and numpy
• FFmpeg

Windows:

• Windows 10+ (64-bit)
• Node.js 18+
• Rust toolchain with x86_64-pc-windows-msvc target
• Python 3 with scipy and numpy
• FFmpeg (downloaded automatically during build)

Installation:

Download pre-built installers:

• macOS: Download the .dmg file from the latest release
• Windows: Download the .exe installer from the latest release. Windows may show a SmartScreen warning — click "More info" then "Run anyway".

Build from source:

1. Clone the repository
2. Install dependencies: npm install
3. Run development build: npm run tauri dev
4. Build production app: npm run tauri build

These steps work on both macOS and Windows.

Usage

1. Select folder containing MP4 videos
2. App groups videos by session time
3. Click Auto-Sync to detect audio offset
4. Position PiP overlay, adjust crop and borders
5. Export final composite video

Platform Support

Platform	Status
macOS Apple Silicon	Supported (primary)
macOS Intel	Untested
Windows 64-bit	Supported
Linux	Not planned

Known Limitations

• Supports 2 cameras only
• MP4 format tested (other formats may work)
• Variable frame rate (VFR) videos may cause sync drift

License

MIT