Grok Imagine Video Video Extend | AI Video Extension API

Grok Imagine Video Extend

Grok Imagine Video Extend is X-AI's video extension model that seamlessly extends existing videos by generating additional frames. Upload a video clip and describe the continuation — the model generates smooth, coherent footage that naturally extends your original content by 6 or 10 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 6 or 10 seconds based on your needs.
Prompt-guided generation Describe how the video should continue for precise control over the extension.
Automatic concatenation The extended footage is automatically merged with the original video for a seamless result.

Parameters

Parameter	Required	Description
video	Yes	Source video to extend (URL or upload).
prompt	Yes	Describe how the video should continue.
duration	No	Extension length: 6 (default) or 10 seconds.

How to Use

Upload your video — provide the source video you want to extend.
Write your prompt — describe how the video should continue (motion, action, scene changes).
Set duration — choose 6 or 10 seconds of extension.
Run — submit and download your extended video.

Pricing

Duration	Cost
6s	$0.30
10s	$0.50

Billing Rules

Rate: $0.05 per second
Duration options: 6 or 10 seconds
Billing is based on the selected duration, not actual playback length

Best Use Cases

Content Extension — Extend short clips into longer sequences for storytelling.
Social Media — Transform brief moments into full-length videos for TikTok, Reels, or Shorts.
Film & Production — Extend establishing shots or B-roll footage.
Looping Content — Create extended versions of clips for backgrounds or displays.
Creative Projects — Continue scenes beyond their original capture.

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 a 6-second extension to test your prompt before committing to 10 seconds.
Describe both motion and atmosphere in your prompt for richer results.

Notes

Both video and prompt are required fields.
Extension duration options: 6 or 10 seconds.
Ensure uploaded video URLs are publicly accessible.
The output includes the original video with the extension appended.

Related Models

Grok Imagine Video Image-to-Video — Generate video from a still image.
Grok Imagine Video Reference-to-Video — Generate video from multiple reference images.
Grok Imagine Video Edit — Edit existing videos with text instructions.

Grok Imagine Video Video Extend API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/x-ai/grok-imagine-video/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 Grok Imagine Video Video Extend below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/x-ai/grok-imagine-video/video-extend" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "video": "https://example.com/your-input.mp4",
    "duration": 6
}'

# 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("x-ai/grok-imagine-video/video-extend", {
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "video": "https://example.com/your-input.mp4",
        "duration": 6
});

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

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "x-ai/grok-imagine-video/video-extend",
    {
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "video": "https://example.com/your-input.mp4",
    "duration": 6
}
)

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

Grok Imagine Video Video Extend API — Frequently asked questions

What is the Grok Imagine Video Video Extend API?

Grok Imagine Video Video Extend is a xAI model for video extension, exposed as a REST API on WaveSpeedAI. X-AI Grok Imagine Video Extend turns short clips into longer videos with smooth motion continuity and natural scene extension. 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 Grok Imagine Video 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/x-ai/x-ai-grok-imagine-video-video-extend.

How much does Grok Imagine Video Video Extend cost per run?

Grok Imagine Video Video Extend starts at $0.050 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 Grok Imagine Video 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/x-ai/x-ai-grok-imagine-video-video-extend.

How do I get started with the Grok Imagine Video 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 Grok Imagine Video Video Extend outputs commercially?

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

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