LTX 2.3 Lipsync | AI Digital Human API

LTX-2.3 Lipsync

LTX-2.3 Lipsync is an advanced AI model that generates talking head videos from audio and an optional reference image. Built on the LTX-2.3 DiT-based architecture with improved audio-visual quality, it creates realistic lip-synced videos that match your audio input.

Why Choose This?

Improved quality Enhanced audio-visual alignment with better lip sync accuracy and natural facial movements.
Audio-driven generation Automatically generates video with synchronized lip movements from audio input.
Optional reference image Provide a portrait image to use as the base, or let the model use a default portrait.
Flexible resolution Supports 480p, 720p, and 1080p outputs to balance quality and cost.
Automatic duration Video length automatically matches audio duration (5-20 seconds).

Parameters

Parameter	Required	Description
audio	Yes	Audio file URL - duration determines video length (5-20s)
image	No	Reference portrait image (optional)
prompt	No	Text prompt to guide generation style and motion
resolution	No	Output resolution: 480p, 720p (default), or 1080p
seed	No	Random seed for reproducibility (-1 for random)

Resolution Options

Resolution	Best For
480p	Fast previews, iteration, lowest cost
720p	Balanced quality and cost (default)
1080p	Final delivery, maximum detail

How to Use

Upload your audio — the audio track that drives the video (5-20 seconds).
Upload reference image (optional) — a portrait to use as the base character.
Add prompt (optional) — describe the style or motion you want.
Select resolution — 480p for iteration, 720p for balance, 1080p for final output.
Run — submit and download the lip-synced video.

Pricing

Pricing is based on audio duration (automatically detected):

Resolution	5s	10s	15s	20s
480p	$0.10	$0.20	$0.30	$0.40
720p	$0.15	$0.30	$0.45	$0.60
1080p	$0.20	$0.40	$0.60	$0.80

Best Use Cases

Talking Head Videos — Generate spokesperson videos from audio recordings.
Content Localization — Create videos in multiple languages from audio tracks.
Virtual Presenters — Generate AI presenters for training, marketing, or education.
Audio-to-Video — Convert podcasts or audio content into video format.
Character Animation — Bring portraits to life with synchronized speech.

Pro Tips

Audio quality directly affects lip sync accuracy - use clear audio.
Provide a frontal portrait image for best results.
Use prompt to guide facial expressions and style.
Iterate at 480p to verify results, then render at higher resolution.
Audio duration is automatically detected - no need to specify manually.

Notes

Audio duration must be between 5-20 seconds.
If no reference image is provided, a default portrait will be used.
Video length automatically matches audio duration.

Related Models

LTX-2.3 Text-to-Video — Generate video with audio from text.
LTX-2.3 Image-to-Video — Animate images with synchronized audio.

Ltx 2.3 Lipsync API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/ltx-2.3/lipsync with your input as JSON. The endpoint returns a prediction id; poll the prediction endpoint until status flips to completed, then read the output URL from data.outputs[0]. Examples for Ltx 2.3 Lipsync below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/ltx-2.3/lipsync" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "audio": "https://example.com/your-audio.mp3",
    "image": "https://example.com/your-input.jpg",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "resolution": "720p",
    "seed": -1
}'

# Response includes a prediction id. Poll for the result:
curl -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY"

# When status is "completed", read the output from data.outputs[0].

Node.js example

// npm install wavespeed
const WaveSpeed = require('wavespeed');

const client = new WaveSpeed(); // reads WAVESPEED_API_KEY from env

const result = await client.run("wavespeed-ai/ltx-2.3/lipsync", {
        "audio": "https://example.com/your-audio.mp3",
        "image": "https://example.com/your-input.jpg",
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "resolution": "720p",
        "seed": -1
});

console.log(result.outputs[0]); // → URL of the generated output

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "wavespeed-ai/ltx-2.3/lipsync",
    {
    "audio": "https://example.com/your-audio.mp3",
    "image": "https://example.com/your-input.jpg",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "resolution": "720p",
    "seed": -1
}
)

print(output["outputs"][0])  # → URL of the generated output

Ltx 2.3 Lipsync API — Frequently asked questions

What is the Ltx 2.3 Lipsync API?

Ltx 2.3 Lipsync is a WaveSpeedAI model for talking-avatar generation, exposed as a REST API on WaveSpeedAI. LTX-2.3 Lipsync generates talking head videos from audio with synchronized lip movements and natural facial expressions. Built on DiT-based architecture with improved audio-visual alignment quality. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing. You can call it programmatically or try it from the playground above.

How do I call the Ltx 2.3 Lipsync API?

POST your input parameters to the model's REST endpoint (shown in the API tab of this playground) with your WaveSpeedAI API key in the Authorization header. Submission returns a prediction ID; poll the prediction endpoint until status flips to "completed", then read the output URL from the result. The playground generates a ready-to-paste code sample in Python, JavaScript, or cURL for whatever inputs you've set. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/wavespeed-ai/ltx-2.3-lipsync.

How much does Ltx 2.3 Lipsync cost per run?

Ltx 2.3 Lipsync starts at $0.10 per run. That figure is the base price — the final charge scales with the parameters you set in the form (output size, length, count, references, or whatever knobs this model exposes), so a higher-quality or larger output costs more than a minimal one. The exact cost for your current input is shown live next to the Generate button before you submit, and the actual per-call charge is recorded on the prediction afterwards.

What inputs does Ltx 2.3 Lipsync accept?

Key inputs: `prompt`, `image`, `audio`, `resolution`, `seed`. The full JSON schema (types, defaults, allowed values) is rendered above the Generate button and mirrored in the API reference at https://wavespeed.ai/docs/docs-api/wavespeed-ai/ltx-2.3-lipsync.

How do I get started with the Ltx 2.3 Lipsync API?

Sign up for a free WaveSpeedAI account to claim starter credits, copy your API key from /accesskey, then call the endpoint shown in the API tab of the playground. The playground also auto-generates a code sample in Python, JavaScript, or cURL for the parameters you've set.

Can I use Ltx 2.3 Lipsync outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (WaveSpeedAI). The license summary appears on the model card above; see WaveSpeedAI's Terms of Service for platform-level conditions.

ExamplesView all

Related Models

README

LTX-2.3 Lipsync

Why Choose This?

Parameters

Resolution Options

How to Use

Pricing

Best Use Cases

Pro Tips

Notes

Related Models

Ltx 2.3 Lipsync API — Quick start

Ltx 2.3 Lipsync API — Frequently asked questions