LTX 2 Video Extend | AI Video Extension API

LTX-2 Video Extend

LTX-2 Video Extend seamlessly extends existing videos by generating additional frames based on your text description. Upload a video clip and describe the continuation — the model generates smooth, coherent footage that naturally extends your original content by up to 20 seconds.

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-guided generation Describe how the video should continue for precise control over the extension.
Per-second billing Simple, transparent pricing at $0.10 per second of extension.
Prompt Enhancer Built-in tool to automatically improve your continuation descriptions.

Parameters

Parameter	Required	Description
video	Yes	Source video to extend (URL or upload)
prompt	No	Describe how the video should continue
duration	No	Extension length in seconds (min: 1, max: 20, default: 5)

How to Use

Upload your video — provide the source video you want to extend.
Write your prompt (optional) — describe how the video should continue (motion, action, scene changes).
Set duration — choose how many seconds to extend (1–20 seconds).
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
Minimum: 1 second
Maximum: 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.
Creative Projects — Add additional motion and narrative to existing clips.

Pro Tips

Use detailed prompts describing how the motion, camera, and scene should continue.
Include character actions, camera movements, and environmental details in your prompt.
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.

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

Wan 2.6 Video Extend — Alternative video extension model.

Ltx 2 Video Extend API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/ltx-2/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 Video Extend below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/ltx-2/video-extend" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "video": "https://example.com/your-input.mp4",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "duration": 5
}'

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

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

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "wavespeed-ai/ltx-2/video-extend",
    {
    "video": "https://example.com/your-input.mp4",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "duration": 5
}
)

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

Ltx 2 Video Extend API — Frequently asked questions

What is the Ltx 2 Video Extend API?

Ltx 2 Video Extend is a WaveSpeedAI model for video extension, exposed as a REST API on WaveSpeedAI. LTX Video 2.0 extends existing videos by generating new content at the start or end. Supports prompt-guided extension up to 20 seconds. 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 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-video-extend.

How much does Ltx 2 Video Extend cost per run?

Ltx 2 Video Extend 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 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-video-extend.

How do I get started with the Ltx 2 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 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.

ExamplesView all

Related Models

README

LTX-2 Video Extend

Why Choose This?

Parameters

How to Use

Pricing

Billing Rules

Best Use Cases

Pro Tips

Notes

Related Models

Ltx 2 Video Extend API — Quick start

Ltx 2 Video Extend API — Frequently asked questions