Seedance 2.0 Mini Video Extend API

ByteDance Seedance 2.0 Mini Video Extend

ByteDance Seedance 2.0 Mini Video Extend continues an existing video by generating a new segment from the input video's last frame. Upload a source video, describe the cinematic continuation, optionally provide a target last frame, and generate an extended video segment with synchronized native audio.

Need to generate from text instead? Try ByteDance Seedance 2.0 Mini Text-to-Video.
Need to generate from a start image instead? Try ByteDance Seedance 2.0 Mini Image-to-Video.

Why Choose This?

Video continuation
Extend an existing video by generating a new segment that continues from the input video's last frame.
Prompt-guided extension
Describe the action, camera movement, lighting, and mood for the new segment.
Optional target last frame
Provide last_image when you want the new segment to interpolate toward a specific ending frame.
Native audio generation
Generate synchronized audio together with the extended video segment using generate_audio.
Flexible resolution options
Choose 480p, 720p, 1080p, or 4k depending on your quality and cost needs.
Web search option
Enable enable_web_search when the continuation needs real-time information.

Parameters

Parameter	Required	Description
prompt	Yes	Describe the cinematic continuation, including action, camera movement, lighting, and mood.
video	Yes	URL of the input video to extend. Generation continues from the last frame.
last_image	No	Optional target last-frame URL. If provided, the new segment interpolates from the input video's last frame to this image.
resolution	No	Output resolution of the new segment: `480p`, `720p`, `1080p`, or `4k`. Default: `720p`.
duration	No	Length in seconds of the new segment to append. Range: `4–15`. Default: `5`.
enable_web_search	No	Enable web search for real-time information. Default: `false`.
generate_audio	No	Whether to generate native audio synchronized with the output video. Default: `true`.

How to Use

Write your prompt — Describe how the video should continue, including subject action, camera movement, lighting, and mood.
Upload the source video — Provide the input video that should be extended.
Add a last image optional — Use last_image when you want to guide the ending frame of the new segment.
Choose resolution — Select 480p, 720p, 1080p, or 4k.
Set duration — Choose the length of the new segment between 4 and 15 seconds.
Configure audio optional — Keep generate_audio enabled for synchronized native audio, or disable it if audio is not needed.
Submit — Generate the extended video segment.

Example Prompt

Continue the scene with a slow forward camera movement, the character walking deeper into the neon-lit street, soft rain falling, reflections glowing on the pavement, cinematic lighting, calm but mysterious atmosphere.

Pricing

Per 5 Seconds

Resolution	Cost
480p	$0.30
720p	$0.60
1080p	$1.50
4k	$3.00

Per Second

Resolution	Cost
480p	$0.06
720p	$0.12
1080p	$0.30
4k	$0.60

Example Costs

Resolution	4s	5s	10s	15s
480p	$0.24	$0.30	$0.60	$0.90
720p	$0.48	$0.60	$1.20	$1.80
1080p	$1.20	$1.50	$3.00	$4.50
4k	$2.40	$3.00	$6.00	$9.00

Best Use Cases

Video extension — Continue an existing clip with a newly generated segment.
Scene continuation — Extend character action, camera movement, lighting, and atmosphere from the source video.
Target-frame continuation — Use last_image to guide the ending direction of the new segment.
Cinematic short clips — Generate continued video segments with synchronized native audio.
Creative prototyping — Test alternate continuations from the same source video.

Pro Tips

Use a source video with a clear ending frame.
Keep the prompt focused on what should happen next.
Use last_image when the final frame or ending direction matters.
Describe visible motion, camera behavior, lighting, and mood.
Use 480p for quick testing, 720p for standard output, 1080p for higher-resolution results, and 4k for maximum-resolution output.
Keep generate_audio enabled when you want the extended segment to include synchronized native audio.

Related Models

ByteDance Seedance 2.0 Mini Text-to-Video — Generate video directly from text prompts.
ByteDance Seedance 2.0 Mini Image-to-Video — Generate video from a start image and prompt.

Seedance 2.0 Mini Video Extend API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0-mini/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 Seedance 2.0 Mini Video Extend below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0-mini/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",
    "resolution": "720p",
    "duration": 5,
    "enable_web_search": false,
    "generate_audio": true
}'

# 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("bytedance/seedance-2.0-mini/video-extend", {
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "video": "https://example.com/your-input.mp4",
        "resolution": "720p",
        "duration": 5,
        "enable_web_search": false,
        "generate_audio": true
});

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

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "bytedance/seedance-2.0-mini/video-extend",
    {
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "video": "https://example.com/your-input.mp4",
    "resolution": "720p",
    "duration": 5,
    "enable_web_search": false,
    "generate_audio": true
}
)

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

Seedance 2.0 Mini Video Extend API — Frequently asked questions

What is the Seedance 2.0 Mini Video Extend API?

Seedance 2.0 Mini Video Extend is a ByteDance model for video extension, exposed as a REST API on WaveSpeedAI. Seedance 2.0 Mini Video Extend is ByteDance's faster, lower-cost video extension model for cinematic multi-shot continuation. It extends existing videos into seamless narrative sequences with AI camera control, consistent characters, motion continuity, 480P / 720P / 1080P / 4K output, 4-15s duration, and flexible aspect ratios. 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 Seedance 2.0 Mini 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/bytedance/bytedance-seedance-2.0-mini-video-extend.

How much does Seedance 2.0 Mini Video Extend cost per run?

Seedance 2.0 Mini Video Extend starts at $0.60 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 Seedance 2.0 Mini Video Extend accept?

Key inputs: `prompt`, `video`, `resolution`, `duration`, `enable_web_search`, `generate_audio`. 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/bytedance/bytedance-seedance-2.0-mini-video-extend.

How do I get started with the Seedance 2.0 Mini 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 Seedance 2.0 Mini Video Extend outputs commercially?

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

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