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LTX Video 2 Lipsync: AI Lipsync

LTX-2-19B LipSync generates a realistic talking video by synchronizing a person’s mouth movements to an input audio clip. It preserves facial identity, head position, lighting, and natural expressions while producing accurate lip motion, subtle blinking, and stable temporal consistency. Ideal for avatars, dubbing, dialogue replacement, and character narration.

Interactive model controls

LTX-2-19B LipSync generates a realistic talking video by synchronizing a person’s mouth movements to an input audio clip. It preserves facial identity, head position, lighting, and natural expressions while producing accurate lip motion, subtle blinking, and stable temporal consistency. Ideal for avatars, dubbing, dialogue replacement, and character narration.

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Overview

About this model

LTX-2-19B LipSync is a cutting-edge audio-to-video model that generates realistic talking videos by synchronizing a subject's lip movements to an input audio clip. Leveraging advanced deep learning techniques, this model ensures that facial identity, head positioning, ambient lighting, and natural expressions are preserved while delivering ultra-accurate lip sync performance. The technology behind LTX-2-19B is designed to maintain subtle details like blinking and gentle head motion, resulting in videos with remarkable temporal consistency and realism.

Ideal for tasks such as avatar creation, dialogue replacement, dubbing, and character narration, LTX-2-19B LipSync bridges the gap between static images and dynamic storytelling. Its ability to produce lifelike videos at a competitive cost of $0.2 per generation makes it a standout solution for creatives and developers seeking state-of-the-art performance without compromising on quality. The model’s versatile capabilities and robust technical foundation set a new standard in audio-driven video synthesis.

1Creating lifelike avatars for virtual meetings and video conferencing.
2Dubbing and dialogue replacement in films, documentaries, and animations.
3Generating character narrations for educational and explainer videos.
4Enhancing social media content with realistic lip-syncing videos.
5Producing immersive marketing and advertisement videos with synchronized audio.
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Pricing & Value

Cost analysis

muapiapp$0.2 per generation

muapiapp is 20-50% more affordable than its competitors while delivering comparable or superior quality.

Fal.ai$0.3 per generation

muapiapp is approximately 33% cheaper, offering better value without compromising on performance.

Replicate$0.3 per generation

With muapiapp cost-effectiveness being 20-50% lower, it provides a competitive edge in both quality and pricing.

** Competitor pricing is estimated based on similar model architectures and usage tiers.

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Technical Details

Configuration schema

Promptstring

The prompt to generate the video

Default ValueAnimate natural lip-sync to the provided audio, add subtle blinking and gentle head motion, maintain the original lighting and facial identity, keep the performance realistic and stable.
Image URLstring

URL of the input image.

Default Valuehttps://d3adwkbyhxyrtq.cloudfront.net/webassets/videomodels/ltx-2-19b-lipsync.jpg
Audio URLstring

The URL for uploading audio files.

Default Valuehttps://d3adwkbyhxyrtq.cloudfront.net/webassets/videomodels/ltx-2-19b-lipsync.wav
ResolutionEnum (3 options)

The resolution of the generated video.

Default Value720p
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Implementation Guide

Developer documentation

How to Use LTX-2-19B LipSync

Step 1: Prepare Your Inputs

  • Image URL: Provide a clear image where the facial characteristics are distinct.
  • Audio URL: Ensure the narrated audio clip is of high quality. The audio will drive the lip-sync animation.
  • Prompt: Craft a precise prompt that instructs the model on the desired lip sync details, including any additional motions like blinking or head movement.
  • Resolution: Choose the desired video resolution from the options (480p, 720p, 1080p). The default is 720p.

Step 2: Submit Your Request

  • Use the provided API endpoint (ltx-2-19b-lipsync) to submit the input JSON data. Ensure that the audio_url field is included as it is mandatory for generating the video.

Step 3: Interpret the Results

  • Once processed, the output will contain a URL to the generated video that exhibits synchronized lip movements and realistic facial expressions. Review the video to confirm that the lip sync, head positioning, and overall animation meet your expectations.

Step 4: Iterate if Necessary

  • Based on the output, adjust your prompt or input parameters and resubmit to fine-tune the final video.
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Common Questions

Frequently asked

What is the primary function of the LTX-2-19B LipSync model?

The model generates realistic talking videos by synchronizing lip movements with an input audio clip while preserving facial identity, head position, lighting, and natural expressions.

What input fields are mandatory?

The only mandatory field is the `audio_url`. However, providing an `image_url` and a detailed `prompt` enhances the video’s realism by specifying desired movements and expressions.

What resolutions are available for the generated video?

The model supports three resolutions: 480p, 720p (default), and 1080p.

How does LTX-2-19B LipSync ensure video quality?

The model employs advanced deep learning techniques that maintain temporal consistency, accurate lip motion, subtle blinking, and natural head movements, ensuring high fidelity and lifelike video outputs.