Alibaba Wan 2.5 Video Extend Fast

Alibaba Wan 2.5 Video Extend Fast

Playground

WAN 2.5 Fast is an AI-powered video extender that turns short clips into longer videos while preserving audio tracks for seamless extensions. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

WAN 2.5 is an advanced video generation model on Cloud’s DashScope. It generates high-quality videos from images and supports output resolutions of 480p, 720p, and 1080p.

✨ Why This endpoint is special

• Seamless extension: Extends videos naturally — no abrupt cuts or looping artifacts. The motion flow and scene lighting stay coherent frame to frame.
• Flexible duration control: Choose any target length from 3 s – 10 s (3, 4, 5, 6, 7, 8, 9, 10 s all supported).
• One-pass A/V sync: Automatically aligns audio and mouth movements, ensuring natural speech and rhythm without manual editing.
• Multilingual friendly: Supports prompts in Chinese and English for synchronized video generation with accurate lip-sync.
• Custom audio option: You can upload your own audio (music or voice) or let the model generate one for you — plug-and-play.
• Lightweight and affordable: Built for creators and teams who need fast, consistent, and cost-effective video outputs.

🧩 Designed For

• Content creators & storytellers: Extend scenes smoothly to fit a beat, dialogue, or camera motion.
• Marketing teams: Produce multiple ad variations from a single core clip — faster, cheaper, consistent.
• Corporate training teams: Expand short clips into complete learning segments without reshooting.
• Global enterprises: Generate localized, multilingual video extensions for different audiences.

⚙️ How to Use

1. Upload your base video clip.
2. (Optional) Upload an audio file (.wav / .mp3, ≤ 15 MB, 3–30 s).
3. Enter your prompt or description (supports Chinese / English).
4. Select the output duration (3 s – 10 s).
5. Choose resolution (480p / 720p / 1080p).
6. Submit the job — wait a few moments, preview, and download your extended video.

💡 Audio Handling

• If audio > chosen video length: Only the first segment (3 s, 5 s, 10 s etc.) is used.
• If audio < chosen video length: Remaining video plays silently.
• If no audio: WAN 2.5 can auto-generate one or leave it silent.

💰 Pricing

🧠 Pro Tips

• Start with 5 s for testing — balance between cost and quality.
• Upload high-quality input videos to maximize motion consistency.
• Keep your prompt concise but descriptive: include mood, motion, and scene intent.
• For multilingual videos, specify the desired spoken language in your prompt.

📎 Note

• If you didn’t upload your image or video locally, please ensure that the media URL is publicly accessible. A successfully accessible file will display a preview in the interface.

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",
  "resolution": "720p",
  "duration": 5,
  "enable_prompt_expansion": false,
  "seed": -1
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/alibaba/wan-2.5/video-extend-fast" \
  -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