LatentSync Video to Video

fal-ai/latentsync
LatentSync is a video-to-video model that generates lip sync animations from audio using advanced algorithms for high-quality synchronization.
Inference
Commercial use

Input

Additional Settings

Customize your input with more control.

Result

Idle

Waiting for your input...

Your request will cost $0.2 for videos up to 40 seconds. For longer videos, you will be charged $0.005 per second of output video.

Logs

Readme

LatentSync - Advanced AI Lip Sync Animation

LatentSync is a state-of-the-art video-to-video model that generates high-quality lip sync animations from audio using advanced algorithms. Perfect for applications requiring realistic synchronization between video and audio content.

Overview

LatentSync delivers professional-grade lip synchronization through an end-to-end framework based on audio-conditioned latent diffusion models. Created by ByteDance, this model excels at creating natural, smooth lip-sync effects without intermediate representations, supporting both real-life and anime character video processing.

Key Benefits

Transform your videos with LatentSync's powerful capabilities:

Realistic Synchronization

  • High-quality lip sync animations with natural mouth movements
  • Temporal consistency through TREPA (Temporal REPresentation Alignment)
  • Support for both real-life and animated characters

Developer Experience

  • Simple REST API with comprehensive SDKs
  • Straightforward video + audio input workflow
  • Detailed documentation and examples

Enterprise Ready

  • Production-grade reliability
  • Flexible pricing for videos of different lengths
  • Professional support available
Getting Started

Getting up and running with LatentSync takes just a few minutes. Here's how:

  1. Install the SDK for your platform:

JavaScript/TypeScript:

bash
npm install --save @fal-ai/client

Python:

bash
pip install fal-client
  1. Configure your credentials:
javascript
import { fal } from "@fal-ai/client";

fal.config({
  credentials: "YOUR_FAL_KEY_HERE"
});
  1. Make your first API call:
javascript
const result = await fal.subscribe("fal-ai/latentsync", {
  input: {
    video_url: "https://example.com/your-video.mp4",
    audio_url: "https://example.com/your-audio.mp3"
  }
});

console.log(result.video.url);
Implementation Guide

LatentSync works with two primary inputs:

Video Input

  • Supported formats: MP4, MOV, WebM, M4V, GIF
  • Upload your source video containing the face/character to be synchronized

Audio Input

  • Supported formats: MP3, OGG, WAV, M4A, AAC
  • The audio file that will drive the lip synchronization
Error Handling

Always implement proper error handling:

javascript
try {
  const result = await fal.subscribe("fal-ai/latentsync", {
    input: { 
      video_url: "your-video-url",
      audio_url: "your-audio-url"
    }
  });
} catch (error) {
  console.error("Lip sync generation failed:", error.message);
  // Implement appropriate fallback behavior
}
API Parameters
  • `video_url` (required): URL of the input video
  • `audio_url` (required): URL of the audio file for lip synchronization

Additional settings can be customized through the control panel when available.

Technical Specifications

Architecture

  • End-to-end lip sync framework based on audio-conditioned latent diffusion models
  • Uses Whisper model to convert speech into audio embeddings
  • Integrates embeddings into U-Net through cross-attention layers
  • TREPA technology for enhanced temporal consistency

Performance

  • Processing time varies based on video length
  • Maintains high-resolution video quality
  • Smooth temporal consistency without frame discrepancies
Use Cases

LatentSync excels in various applications:

  • Film & Video Dubbing: Create perfect lip sync for dubbed content
  • Virtual Avatars: Animate digital characters with realistic speech
  • Gaming: Sync NPC dialogue for immersive experiences
  • Education: Create language learning content with accurate pronunciation visuals
  • Advertising: Generate lip-synced content for virtual spokespersons
Pricing and Usage

Transparent, duration-based pricing:

  • Up to 40 seconds: $0.20 per video
  • Longer videos: $0.005 per second of output video

View detailed pricing or contact sales for enterprise solutions.

Queue Management

For asynchronous processing:

javascript
// Submit request
const { request_id } = await fal.queue.submit("fal-ai/latentsync", {
  input: {
    video_url: "your-video-url",
    audio_url: "your-audio-url"
  }
});

// Check status
const status = await fal.queue.status("fal-ai/latentsync", {
  requestId: request_id
});

// Get result
const result = await fal.queue.result("fal-ai/latentsync", {
  requestId: request_id
});
Support and Resources

We're here to help you succeed with LatentSync:

About LatentSync

LatentSync represents a breakthrough in lip synchronization technology, diverging from previous diffusion-based methods by directly leveraging the capabilities of Stable Diffusion to model complex audio-visual correlations. The model is fully open source, providing researchers and developers the ability to reproduce and improve this technology.

Ready to Create Perfect Lip Sync?

Get started at fal.ai/login and start creating realistic lip sync animations today with LatentSync.