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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.

video-extend
Entrée

En attente

$0.05par exécution·~20 / $1

ExemplesTout voir

The father was telling his daughter a story.

Modèles associés

README

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

ParameterRequiredDescription
videoYesSource video to extend (URL or upload).
promptYesDescribe how the video should continue.
durationNoExtension length: 6 (default) or 10 seconds.

How to Use

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

Pricing

DurationCost
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

Remarque :Ce site utilise des modèles d'IA fournis par des tiers. Les prix de la documentation sont indicatifs et peuvent être obsolètes. Le bouton Generate affiche une estimation ; le montant final de la tâche prévaut.

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. Start polling the result endpoint around every 2 seconds, increase the interval for long-running tasks, and stop on any terminal status. On completed, read output values from data.outputs. Examples for Grok Imagine Video Video Extend below.

HTTP example
set -euo pipefail

: "${WAVESPEED_API_KEY:?Set WAVESPEED_API_KEY}"

REQUEST_BODY=$(cat <<'JSON'
{
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
    "duration": 6
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/x-ai/grok-imagine-video/video-extend" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d "$REQUEST_BODY")

TASK=$(printf '%s' "$SUBMIT_RESPONSE" | jq 'if has("data") then .data else . end')
PREDICTION_ID=$(printf '%s' "$TASK" | jq -r '.id')
if [ -z "$PREDICTION_ID" ] || [ "$PREDICTION_ID" = "null" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL=$(printf '%s' "$TASK" | jq -r '.urls.get // empty')
if [ -z "$RESULT_URL" ]; then
  RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/$PREDICTION_ID/result"
fi

# 2. Poll until the prediction finishes.
while true; do
  RESPONSE=$(curl --silent --show-error --fail-with-body "$RESULT_URL" \
    -H "Authorization: Bearer $WAVESPEED_API_KEY")
  RESULT=$(printf '%s' "$RESPONSE" | jq 'if has("data") then .data else . end')
  STATUS=$(printf '%s' "$RESULT" | jq -r '.status')
  case "$STATUS" in
    completed) printf '%s\n' "$RESULT" | jq '.outputs'; break ;;
    failed|cancelled|timeout) printf '%s\n' "$RESULT" | jq . >&2; exit 1 ;;
    created|processing) sleep 2 ;;
    *) printf 'Unexpected status: %s
' "$STATUS" >&2; exit 1 ;;
  esac
done
Node.js example
const submitUrl = "https://api.wavespeed.ai/api/v3/x-ai/grok-imagine-video/video-extend";
const apiKey = process.env.WAVESPEED_API_KEY;
if (!apiKey) throw new Error('Set WAVESPEED_API_KEY');

async function requestJson(url, options = {}) {
  const response = await fetch(url, options);
  if (!response.ok) throw new Error(await response.text());
  return response.json();
}

// 1. Submit the prediction.
const body = await requestJson(submitUrl, {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${apiKey}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
        "duration": 6
}),
});
const task = body.data ?? body;
if (!task.id) throw new Error("Submission response did not contain a prediction id");
const resultUrl = task.urls?.get ||
  `https://api.wavespeed.ai/api/v3/predictions/${task.id}/result`;

// 2. Poll until the prediction finishes.
while (true) {
  const resultBody = await requestJson(resultUrl, {
    headers: { "Authorization": `Bearer ${apiKey}` },
  });
  const result = resultBody.data ?? resultBody;
  if (result.status === "completed") {
    console.log(result.outputs);
    break;
  }
  if (["failed", "cancelled", "timeout"].includes(result.status)) throw new Error(JSON.stringify(result));
  if (!["created", "processing"].includes(result.status)) throw new Error("Unexpected status: " + result.status);
  await new Promise(resolve => setTimeout(resolve, 2000));
}
Python example
import json
import os
import time
from urllib.request import Request, urlopen

api_key = os.environ["WAVESPEED_API_KEY"]
headers = {"Authorization": f"Bearer {api_key}", "Content-Type": "application/json"}
payload = {
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
    "duration": 6
}

def request_json(url, data=None):
    request = Request(url, data=data, headers=headers, method="POST" if data else "GET")
    with urlopen(request) as response:
        return json.load(response)

# 1. Submit the prediction.
body = request_json("https://api.wavespeed.ai/api/v3/x-ai/grok-imagine-video/video-extend", json.dumps(payload).encode())
task = body.get("data", body)
if not task.get("id"):
    raise RuntimeError("Submission response did not contain a prediction id")
result_url = task.get("urls", {}).get("get") or f"https://api.wavespeed.ai/api/v3/predictions/{task['id']}/result"

# 2. Poll until the prediction finishes.
while True:
    result_body = request_json(result_url)
    result = result_body.get("data", result_body)
    status = result.get("status")
    if status == "completed":
        print(result.get("outputs", []))
        break
    if status in {"failed", "cancelled", "timeout"}:
        raise RuntimeError(result)
    if status not in {"created", "processing"}:
        raise RuntimeError(f"Unexpected status: {status}")
    time.sleep(2)

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 result endpoint starting around every 2 seconds, increase the interval for long-running tasks, and stop on any terminal status. The playground generates production-oriented Python, JavaScript, and cURL examples with timeouts, transient-error handling, and safe GET retries. 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 long does Grok Imagine Video Video Extend take to generate?

Median end-to-end generation time on WaveSpeedAI is around 61 seconds per request, based on recent successful runs. Queue time varies with global demand; live status is visible in the prediction record.

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.

Grok Imagine Video Video Extend | AI Video Extension API on WaveSpeedAI