Seedance 2.0 Fast Video Edit | AI Video Enhancement API

Seedance 2.0 Fast Video-Edit

Seedance 2.0 Fast Video-Edit is the faster, cheaper tier of Seedance 2.0 Video-Edit. It edits an input video from a natural-language prompt — change lighting, weather, style, environment, or specific elements while preserving subject identity, composition, and motion of the original.

Key Features

Conversational video editing — Describe the change in plain language; the model rewrites the scene while keeping the original motion intact.
Subject and motion preservation — Faces, objects, and camera movement from the input video stay consistent through the edit.
Multi-reference support — Optionally guide style, character identity, or audio with reference images and audio clips.
Native audio synchronization — Generates synchronized audio in a single pass.
Faster, cheaper — ~19% cheaper than the standard Seedance 2.0 Video-Edit at every resolution.

Parameters

Parameter	Required	Description
prompt	Yes	Describe the edit. The prefix `Edit the input video.` is added automatically.
video	Yes	Input video URL. Videos longer than 15 s are trimmed to 15 s.
reference_images	No	Optional reference images for style or character guidance.
reference_audios	No	Optional reference audio for audio guidance.
duration	No	Output length in seconds (4-15). Auto-detected from the input video if not specified.
aspect_ratio	No	`16:9`, `9:16`, `4:3`, `3:4`, `1:1`, `21:9`. Adapts to the input if not specified.
resolution	No	`480p`, `720p` (default), or `1080p`.
enable_web_search	No	Enable web search for real-time context.

How to Use

Upload the input video. Anything longer than 15 s is trimmed to the first 15 s automatically.
Write the edit prompt. Describe the change you want — the prefix Edit the input video. is added for you.
(Optional) Add references. Reference images can constrain style or identity; reference audio can constrain the soundtrack.
(Optional) Set a duration. Auto-detected from the input video length if not provided.
Run. Receive the edited video with synchronized audio.

Pricing

Billed per second across input duration + output duration. Input duration is clamped to the 2-15 s range (sources shorter than 2 s are padded with the last frame).

Resolution	Per second
480p	$0.065
720p	$0.13
1080p	$0.325

Examples (input 5 s, output 5 s = 10 billed seconds):

Resolution	Cost
480p	$0.65
720p	$1.30
1080p	$3.25

Examples (input 12 s, output 12 s = 24 billed seconds):

Resolution	Cost
480p	$1.56
720p	$3.12
1080p	$7.80

Notes

Inputs longer than 15 s are trimmed to 15 s and inputs shorter than 2 s are padded with the last frame to 2 s before editing — billing reflects the conformed length.
Auto-detected duration matches the input length (rounded up), clamped to the 4-15 s range.
Native audio generation is included.

Related Models

Seedance 2.0 Video-Edit — Standard tier of this model.
Seedance 2.0 Fast Image-to-Video — Fast image-to-video generation.
Seedance 2.0 Fast Text-to-Video — Fast text-to-video generation.

Seedance 2.0 Fast Video Edit API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0-fast/video-edit 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 Fast Video Edit below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0-fast/video-edit" \
  -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",
    "aspect_ratio": "16:9",
    "resolution": "720p",
    "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-fast/video-edit", {
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "video": "https://example.com/your-input.mp4",
        "aspect_ratio": "16:9",
        "resolution": "720p",
        "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-fast/video-edit",
    {
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "video": "https://example.com/your-input.mp4",
    "aspect_ratio": "16:9",
    "resolution": "720p",
    "enable_web_search": false,
    "generate_audio": true
}
)

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

Seedance 2.0 Fast Video Edit API — Frequently asked questions

What is the Seedance 2.0 Fast Video Edit API?

Seedance 2.0 Fast Video Edit is a ByteDance model for video editing, exposed as a REST API on WaveSpeedAI. Seedance 2.0 Fast (Video-Edit) edits an input video from a natural-language prompt at a faster, cheaper tier. Built on ByteDance Seed's unified multimodal architecture, it preserves subject identity, composition, and motion while rewriting lighting, style, weather, environment, or specific elements as instructed. Ready-to-use REST 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 Fast Video Edit 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-fast-video-edit.

How much does Seedance 2.0 Fast Video Edit cost per run?

Seedance 2.0 Fast Video Edit starts at $0.65 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 Fast Video Edit accept?

Key inputs: `prompt`, `video`, `aspect_ratio`, `resolution`, `reference_images`, `enable_web_search`. 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-fast-video-edit.

How do I get started with the Seedance 2.0 Fast Video Edit 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 Fast Video Edit 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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