OVRLEY turns .fit and .gpx activity data into fully custom telemetry overlays for action-cam videos. It features an intuitive, WYSIWYG editor backed by a robust, hardware-accelerated native rendering engine.
- Universal Import: Supports
.fit,.gpxand.srtfiles from any device or service (Strava, Garmin, DJI, GoPro, Insta360 etc.). Works for any activity: running, cycling, drones, skiing, sailing, motorcycling, and more. - Interactive Editor: Drag-and-drop WYSISWG editor for live layout editing and template sharing.
- Full Customization: Shape every widget with your own styling, color, font, and size.
- 29+ Widgets: Speed, heartrate, power, cadence, date, temperature, elevation profile, map route, camera settings, and many more.
- Transparent Overlays: Export with alpha channel (in real-time speed) for maximum flexibility in post-production. Use in Premiere Pro, DaVinci Resolve, Final Cut Pro, or any editor that supports layered video.
- Final Video Export: Export your final video footage with overlays baked in - no separate compositing step required. Multiple codecs, hardware-accelerated pipelines, and custom bitrate.
- Hardware-Accelerated Export: Export pipelines using GPU acceleration for maximum export speed for up to 8x and 2x export speeds (1080p@30fps and 4k@30fps).
- Realtimne Preview: Preview at 4k@30fps directly inside the app before you export. Automatically syncs activity to your video, with manual offset possible.
- 100% Free & Offline: No subscriptions. All data processing, rendering, and encoding happen locally on your machine. Your data never leaves your computer.
- Cross-Platform & Portable: Runs on Windows, macOS, and Linux. Portable build - no installation required; just download and run.
The codebase utilizes a dual-stack architecture to maximize both the user experience and computational performance:
- Frontend Interface: A React application built with Vite (
app), providing a seamless editing environment for overlay positioning, aesthetic customization, and metric synchronization. - Core Engine: A standalone Rust backend (
ovrley_core) utilizing Skia for frame-perfect 2D graphics rendering and FFmpeg for high-speed video compositing. - Desktop Shell: A lightweight Tauri wrapper that bridges the web-based interface with the native Rust core, granting access to the local file system and hardware resources.
OVRLEY supports both exporting transparent overlays as well as final footage with overlays baked in. It offers multiple export pipelines for different hardware and workflow needs:
Transparent Overlays
ProRes CPU: The safest general recommendation. High quality and excellent compatibility with professional editors like Premiere Pro or DaVinci Resolve.ProRes Vulkan: A newer, GPU-accelerated option for ProRes. Frees up your CPU for other tasks, though hardware/driver compatibility may vary.QT RLE: Offers significantly smaller file sizes and extremely fast export times, though with slightly lower compatibility in some basic video players.
MP4 Exports (overlays baked in)
H.264/H.265: Industry-standard codecs for maximum compatibility. Custom bitrate setting to balance quality and file size.
Hardware-Acceleration Options: NVENC/CUDA/AMF/QSV/VideoToolbox hardware-accelerated encoding options to take full advantage of your system and GPU to speed up export times.
Compiling and running OVRLEY requires the following system-level toolchains:
- Node.js & pnpm (Package management and script execution)
- Rust Toolchain (For compiling the Tauri shell and core engine)
- FFmpeg 8.1+ (Full Build) (For video manipulation; installed automatically)
Important: The rendering engine requires an FFmpeg 8.1+ Full Build located within the
vendor/ffmpegdirectory to ensure compatibility with advanced hardware encoders. This is automatically handled by the installation process, but you can manually place your own build there.
The repository setup is automated. When you install the Node dependencies, a custom postinstall script will automatically download and place the required FFmpeg 8.1 binaries into the correct vendor directory.
# Installs packages and automatically provisions the FFmpeg dependency
pnpm installTo launch the application locally with hot-module reloading enabled:
# Starts the frontend server alongside the native Tauri window
pnpm run devThe Rust backend includes several extra test suites covering rendering correctness, cross-pipeline parity, and encoding performance:
| Suite | Purpose | Docs |
|---|---|---|
| Render Baselines | Pixel-level regression tests — rendered frames and videos compared against committed baselines | BASELINES.md |
| Canvas Parity | Rust Skia vs browser SVG pixel comparison with SSIM scoring and diff images | CANVAS_PARITY.md |
| Benchmarks | Real-render encoding benchmarks measuring job time and file size per codec/hardware profile | BENCHMARKS.md |
To compile a production release:
pnpm run buildPortable Distribution: The build process bypasses traditional system installers. Instead, it generates a standalone, portable application packaged neatly within a .zip file. This allows for immediate extraction and execution without elevated system privileges.
Big credit goes to @walkersutton and his Cyclemetry repository, which was the original inspiration and trigger for this project. Without his initial work, OVRLEY likely would not have happened.