Wan 2.5 Video Extend | AI Video Extension API

WAN 2.5 — Video Extender

Video Extender is a specialization built on top of ’s WAN 2.5 model that adds length-extension capabilities. It faithfully inherits all core parameters, behaviors, and quality characteristics of the original WAN 2.5—and operates under the same licensing and copyright terms. Output resolutions remain 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

Upload your base video clip.
(Optional) Upload an audio file (.wav / .mp3, ≤ 15 MB, 3–30 s).
Enter your prompt or description (supports Chinese / English).
Select the output duration (3 s – 10 s).
Choose resolution (480p / 720p / 1080p).
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

Resolution	Price per second	Example (3 s)	Example (5 s)
480p	$0.05	$0.15	$0.25
720p	$0.10	$0.30	$0.50
1080p	$0.15	$0.45	$0.75

🧠 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.

Wan 2.5 Video Extend API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/alibaba/wan-2.5/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 Wan 2.5 Video Extend below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/alibaba/wan-2.5/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",
    "audio": "https://example.com/your-audio.mp3",
    "negative_prompt": "blurry, low quality, distorted",
    "resolution": "720p",
    "duration": 5,
    "enable_prompt_expansion": false,
    "seed": -1
}'

# 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("alibaba/wan-2.5/video-extend", {
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "video": "https://example.com/your-input.mp4",
        "audio": "https://example.com/your-audio.mp3",
        "negative_prompt": "blurry, low quality, distorted",
        "resolution": "720p",
        "duration": 5,
        "enable_prompt_expansion": false,
        "seed": -1
});

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

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "alibaba/wan-2.5/video-extend",
    {
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "video": "https://example.com/your-input.mp4",
    "audio": "https://example.com/your-audio.mp3",
    "negative_prompt": "blurry, low quality, distorted",
    "resolution": "720p",
    "duration": 5,
    "enable_prompt_expansion": false,
    "seed": -1
}
)

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

Wan 2.5 Video Extend API — Frequently asked questions

What is the Wan 2.5 Video Extend API?

Wan 2.5 Video Extend is a Alibaba model for video extension, exposed as a REST API on WaveSpeedAI. WAN 2.5 Video-Extend turns short clips into longer videos with preserved or generated synchronized audio for continuity. 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 Wan 2.5 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/alibaba/alibaba-wan-2.5-video-extend.

How much does Wan 2.5 Video Extend cost per run?

Wan 2.5 Video Extend starts at $0.25 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 Wan 2.5 Video Extend accept?

Key inputs: `prompt`, `video`, `audio`, `resolution`, `duration`, `seed`. 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/alibaba/alibaba-wan-2.5-video-extend.

How long does Wan 2.5 Video Extend take to generate?

Average end-to-end generation time on WaveSpeedAI is around 302 seconds per request — measured across recent runs. Queue time scales with global demand; live status is visible in the prediction record.

Can I use Wan 2.5 Video Extend outputs commercially?

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

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