Wan 2.7 Video Extend

Wan 2.7 Video Extend continues an existing video clip with new AI-generated footage, seamlessly picking up from where the original ends. Upload a source video, describe what should happen next, and optionally provide an audio track — the model generates a natural, motion-consistent extension at 720p or 1080p.

Need to edit a video? Try Wan 2.7 Video Edit
Need to generate from an image? Try Wan 2.7 Image-to-Video

Why Choose This?

Seamless video continuation Extends your existing clip with new AI-generated footage that matches the original motion, style, and scene context.
Prompt-guided extension Describe what should happen next — direct the action, atmosphere, and narrative of the extended segment.
Audio input support Upload an audio track to guide the rhythm and pacing of the extended video.
Negative prompt support Specify what to avoid in the extension for more precise output control.
Prompt expansion Enable enable_prompt_expansion to let the model automatically enrich and optimize your prompt before generation.
Resolution options Generate extensions at 720p or 1080p to match your delivery requirements.

Parameters

Parameter	Required	Description
video	Yes	Source video to extend (URL or file upload).
prompt	Yes	Text description of the desired continuation.
audio	No	Audio URL to guide generation.
negative_prompt	No	Elements to exclude from the generated video.
resolution	No	Output resolution: 720p (default) or 1080p.
duration	No	Total duration of the final output video in seconds (2–15s). Default: 5.
enable_prompt_expansion	No	Enable automatic prompt optimization before generation. Default: off.
seed	No	Random seed for reproducible results. Use -1 for a random seed.

How to Use

Upload your video — provide the source clip to extend via URL or drag-and-drop.
Write your prompt — describe what should happen next in the scene. Use the Prompt Enhancer for better results.
Upload audio (optional) — provide an audio URL to synchronize the extension.
Add negative prompt (optional) — specify elements you want to exclude from the extended footage.
Select resolution — 720p for standard output, 1080p for higher-quality results.
Set duration — choose the total length of the output video in seconds (2–15s).
Enable prompt expansion (optional) — let the model automatically enrich your prompt.
Set seed (optional) — fix the seed to reproduce a specific result in future runs.
Submit — generate, preview, and download your extended video.

Pricing

Duration	720p	1080p
5s	$0.50	$0.75
10s	$1.00	$1.50
15s	$1.50	$2.25

Billing Rules

720p: $0.10 per second
1080p: $0.15 per second (1.5× base rate)
Duration range: 2–15 seconds

Best Use Cases

Short Film & Narrative — Extend key scenes to develop story beats without reshooting.
Social Media Content — Lengthen clips to hit optimal duration for Reels, TikTok, and Shorts.
Marketing & Advertising — Extend product or campaign videos to fill longer ad slots.
Creative Exploration — Explore alternate continuations of the same source clip with different prompts.
Audio-Visual Projects — Synchronize extended footage to a music track or voiceover.

Pro Tips

Be specific about what should happen next — camera movement, subject action, and environmental changes.
Use negative_prompt to prevent the extension from repeating or contradicting the source footage.
Enable prompt expansion for shorter or less detailed prompts to get richer output automatically.
Use 720p to test your extension direction before committing to a 1080p final render.
Fix the seed once you find a direction you like to iterate consistently.

Notes

Both video and prompt are required fields; all other parameters are optional.
Duration range: 2–15 seconds for the total output video length.
Ensure video and audio URLs are publicly accessible if using links rather than direct uploads.
Please ensure your content complies with usage policies.

Related Models

Wan 2.7 Video Edit — Prompt-driven video editing with multi-image reference support.
Wan 2.7 Image-to-Video — Animate a reference image into a cinematic video clip.
Wan 2.7 Text-to-Video — Generate video from text prompts without existing footage.

Wan 2.7 Video Extend API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/alibaba/wan-2.7/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 2.7 Video Extend below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/alibaba/wan-2.7/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-2.7/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-2.7/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 2.7 Video Extend API — Frequently asked questions

What is the Wan 2.7 Video Extend API?

Wan 2.7 Video Extend is a Alibaba model for video extension, exposed as a REST API on WaveSpeedAI. WAN 2.7 Video Extend extends existing videos with optional last frame control and audio support, supporting 720p/1080p output. Ready-to-use REST inference API, best performance, no cold starts, affordable pricing. You can call it programmatically or try it from the playground above.

How do I call the Wan 2.7 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-2.7-video-extend.

How much does Wan 2.7 Video Extend cost per run?

Wan 2.7 Video Extend starts at $0.50 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 2.7 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-2.7-video-extend.

How do I get started with the Wan 2.7 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 Wan 2.7 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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