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leclap
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leclap

Active·★ 34·MIT·Updated 2026-10-20

LeClap is a deterministic, on-device video composition engine that renders videos from a single JSON template across various platforms like Node.js, browsers via WebAssembly, and natively on React Native. It enables reproducible video creation without server uploads or generative models, making it suitable for agent-driven or manual composition workflows.

#Deterministic Video#On-device Processing#React Native#WebAssembly#FFmpeg#JSON Templates
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#AI Agent Integration
#Video Composition Library
$ Install
$ git clone https://github.com/heristop/leclap.git && cd leclap && mise install && pnpm install
↗ Visit site★ GitHub
01

Features

01Template-driven video composition: Define a complete video with a single JSON descriptor, eliminating manual FFmpeg scripting.
02Cross-platform rendering: Renders on Node.js, in browsers (WASM), and natively on React Native, sharing a core engine for reproducible results.
03On-device capture, compose, render: Supports recording from the camera, editing (trim/crop), mixing music, adding transitions, and rendering entirely on the device.
04Agent-callable with MCP server: Exposes the video engine as agent-callable tools via an MCP server, allowing AI agents to author and render templates without an LLM in the output path.
05Typed & validated templates: Ensures robustness and reliability with Zod-validated templates, strict TypeScript, and a dependency-injected architecture.
02

Compatibility

Node.js
Runtime
Verified via docs
Browser
Runtime
Verified via docs
React Native
Platform
Verified via docs
WebAssembly
Technology
Verified via docs
FFmpeg
Dependency
Verified via docs
TypeScript
Language
Verified via docs
03

Quick start

1
$ git clone https://github.com/heristop/leclap.git
2
$ cd leclap
3
$ mise install
4
$ pnpm install
04

Use cases

↳Automated short-form video creation: Create consistent, branded short videos programmatically for social media or marketing campaigns using AI agents or templates.
↳On-device mobile video editing applications: Develop mobile apps that allow users to capture, compose, and render videos directly on their phones without server interaction.
↳Interactive video content generation: Enable dynamic video generation based on user input or data, where templates are populated and rendered on demand in a browser or mobile app.
↳Developer tooling for video pipelines: Provide developers with a robust library and CLI for integrating deterministic video composition into their existing applications or CI/CD pipelines.
05

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⚡Top VS:
VSkmsg★278→VSUnreal_mcp★971→VSkinocut★218→VSwilmai

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heristop /
leclap
↗

Deterministic video composition from one JSON template — renders on Node, in the browser via WebAssembly, and fully on-device on React Native. No server, no upload, no generative model. Agent-callable over MCP.

34MIT
Last commit3d ago
StatusActive
CategoryWorkflow Automation
Links
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