X AI Grok Imagine Video Video Extend API Documentation

X AI Grok Imagine Video Video Extend API Documentation

Playground

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.

Features

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

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

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.

Authentication

For authentication details, please refer to the Authentication Guide.

API Endpoints

Submit Task & Query Result

set -euo pipefail

export WAVESPEED_API_KEY="your-api-key"

REQUEST_BODY=$(cat <<'JSON'
{
  "prompt": "A cinematic ocean wave at sunrise, highly detailed",
  "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 "Authorization: Bearer ${WAVESPEED_API_KEY}" \
  -H "Content-Type: application/json" \
  -d "${REQUEST_BODY}")

TASK=$(printf '%s' "${SUBMIT_RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
PREDICTION_ID=$(printf '%s' "${TASK}" | jq -r '.id // empty')
if [ -z "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL=$(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' "${RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
  STATUS=$(printf '%s' "${RESULT}" | jq -r '.status // empty')

  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

Parameters

Task Submission Parameters

Request Parameters

Response Parameters

Result Request Parameters

Result Response Parameters