LTX 2.3 Video Extend | AI Video Extension API

LTX-2.3 Video Extend

LTX-2.3 Video Extend seamlessly extends existing videos by generating additional frames that naturally continue your content. Upload a video clip and specify how many seconds to add — the model generates smooth, coherent footage that matches the original motion, style, and atmosphere.

Why Choose This?

Seamless extension Generates new frames that naturally continue the motion and style of your original video.
Flexible duration Extend videos by 1 to 20 seconds based on your needs.
Prompt guidance Optional prompts to describe how the video should continue.
LTX-2.3 quality Built on the improved LTX-2.3 architecture for better temporal consistency.
Simple pricing Straightforward per-second billing at $0.10/second.
Prompt Enhancer Built-in tool to automatically improve your continuation descriptions.

Parameters

Parameter	Required	Description
video	Yes	Source video to extend (URL or upload)
duration	No	Extension length in seconds (1–20, default: 6)
prompt	No	Describe how the video should continue

How to Use

Upload your video — provide the source video you want to extend.
Set duration — choose how many seconds to extend (1–20 seconds).
Write your prompt (optional) — describe the motion, action, or scene changes.
Use Prompt Enhancer (optional) — click to refine your description.
Run — submit and download your extended video.

Pricing

Duration	Cost
1 s	$0.10
5 s	$0.50
10 s	$1.00
20 s	$2.00

Billing Rules

Rate: $0.10 per second
Duration range: 1–20 seconds

Best Use Cases

Content Extension — Extend short clips into longer sequences for storytelling.
Scene Continuation — Continue scenes beyond their original capture.
Social Media — Transform brief moments into full-length videos.
Film & Production — Extend establishing shots or B-roll footage.
Loop Creation — Generate additional frames for seamless video loops.

Pro Tips

Use detailed prompts describing how the motion, camera, and scene should continue.
For best results, use source videos with clear motion direction that can be naturally continued.
Start with shorter extensions to test results before generating longer clips.
The model maintains temporal consistency with the original footage.

Notes

Video is required; prompt is optional but recommended for better results.
Duration range: 1–20 seconds.
Ensure uploaded video URLs are publicly accessible.

Related Models

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

Ltx 2.3 Video Extend API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/ltx-2.3/video-extend 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 Video Extend below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/ltx-2.3/video-extend" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "video": "https://example.com/your-input.mp4",
    "duration": 5,
    "prompt": "A cinematic shot of a city at sunset, soft golden light"
}'

# 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/video-extend", {
        "video": "https://example.com/your-input.mp4",
        "duration": 5,
        "prompt": "A cinematic shot of a city at sunset, soft golden light"
});

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/video-extend",
    {
    "video": "https://example.com/your-input.mp4",
    "duration": 5,
    "prompt": "A cinematic shot of a city at sunset, soft golden light"
}
)

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

Ltx 2.3 Video Extend API — Frequently asked questions

What is the Ltx 2.3 Video Extend API?

Ltx 2.3 Video Extend is a WaveSpeedAI model for video extension, exposed as a REST API on WaveSpeedAI. LTX-2.3 is a DiT-based audio-video foundation model designed to generate synchronized video and audio within a single model, with improved audio and visual quality as well as enhanced prompt adherence. 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 Video Extend 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-video-extend.

How much does Ltx 2.3 Video Extend cost per run?

Ltx 2.3 Video Extend starts at $0.50 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 Video Extend accept?

Key inputs: `prompt`, `video`, `duration`. 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-video-extend.

How do I get started with the Ltx 2.3 Video Extend 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 Video Extend 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.

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