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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.

video-to-video
Input
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Idle

$0.65per run·~15 / $10

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ExamplesView all

Replace the black stallion in the frame with a leopard; keep the character appearance, galloping movements, meadow woodland scenery, lighting and composition completely unchanged.

Related Models

README

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

ParameterRequiredDescription
promptYesDescribe the edit.
videoYesInput video URL. Videos longer than 15 s are trimmed to 15 s.
reference_imagesNoOptional reference images for style or character guidance.
reference_audiosNoOptional reference audio for audio guidance.
durationNoOutput length in seconds (4-15). Auto-detected from the input video if not specified.
aspect_ratioNo16:9, 9:16, 4:3, 3:4, 1:1, 21:9. Adapts to the input if not specified.
resolutionNo480p, 720p (default), 1080p, or 4k.
generate_audioNoGenerate synchronized audio for the output video (default: true)
enable_web_searchNoEnable web search for real-time context.

How to Use

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

Writing Effective Prompts

Editing keeps your source video and changes only what you name. Be precise about the scope, and describe the change as from A to B.

State the change plainly

Name exactly what to add, remove, or modify — and use an editing trigger word (add, remove, replace, change to, modify) so the intent is unambiguous.

  • "Replace the man's coffee cup with a book, keep everything else unchanged."
  • "Remove the subtitles."
  • "Change the background from a city street to a snowy forest."

Use timestamps for partial edits

Confine a change to a time range so the rest of the clip is untouched.

  • "From 4-6s, change the man's action from drinking coffee to waving; leave the rest unchanged."

Reference images for edits

Attach images to specify a replacement, and bind each explicitly (see below).

  • "Replace the woman on the right with the person in @image1."

Referencing uploaded assets

When you attach images, videos, or audio, bind each one explicitly in the prompt by its upload order — @image1, @video1, @audio1 — and say what it's for. Don't rely on labels drawn inside the image itself.

  • "The knight in @image1 walks through the castle in @image2."
  • "Refer to @video1 for the camera movement only; keep its shot order."
  • "@image1 and @image2 are Character 1, voiced by @audio1."

When a reference is already accurate, just point to it — no need to re-describe it in detail.

Audio edits

You can add, remove, or modify audio too.

  • "Translate the dialogue to Spanish, keep lip movements matched, no subtitles."
  • "Remove the background music; keep only ambient and action sounds."

Negative control

Positive descriptions work best, but you can suppress subtitles and audio:

  • "No subtitles."
  • "No BGM — ambient and action sounds only."
  • "No audio."

Weak vs. strong

prompt
weakchange the video
strongReplace the red car in the video with a black motorcycle, matching its motion and speed. Keep the road, lighting, and camera movement unchanged. From 2s onward, add faint dust kicked up behind the rear wheel. Keep the original engine 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).

ResolutionPer second
480p$0.065
720p$0.13
1080p$0.325
4k$0.650

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

ResolutionCost
480p$0.65
720p$1.30
1080p$3.25
4k$6.50

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

ResolutionCost
480p$1.56
720p$3.12
1080p$7.80
4k$15.60

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

Notice: Use @image1, @image2, @audio1, etc. to reference your uploaded assets. The references will stay as plain text—don't worry.

Note:This website uses AI models provided by third parties. Documentation prices are for reference and may be outdated. The Generate button shows an estimate; the final task charge prevails.

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. Start polling the result endpoint around every 2 seconds, increase the interval for long-running tasks, and stop on any terminal status. On completed, read output values from data.outputs. Examples for Seedance 2.0 Fast Video Edit below.

HTTP example
set -euo pipefail

: "${WAVESPEED_API_KEY:?Set WAVESPEED_API_KEY}"

REQUEST_BODY=$(cat <<'JSON'
{
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
    "aspect_ratio": "16:9",
    "resolution": "720p",
    "enable_web_search": false,
    "generate_audio": true
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0-fast/video-edit" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d "$REQUEST_BODY")

TASK=$(printf '%s' "$SUBMIT_RESPONSE" | jq 'if has("data") then .data else . end')
PREDICTION_ID=$(printf '%s' "$TASK" | jq -r '.id')
if [ -z "$PREDICTION_ID" ] || [ "$PREDICTION_ID" = "null" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/$PREDICTION_ID/result"

# 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' "$RESPONSE" | jq 'if has("data") then .data else . end')
  STATUS=$(printf '%s' "$RESULT" | jq -r '.status')
  case "$STATUS" in
    completed) printf '%s\n' "$RESULT" | jq '.outputs'; break ;;
    failed|cancelled|timeout|deleted) printf '%s\n' "$RESULT" | jq . >&2; exit 1 ;;
    *) sleep 2 ;;
  esac
done
Node.js example
const submitUrl = "https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0-fast/video-edit";
const apiKey = process.env.WAVESPEED_API_KEY;
if (!apiKey) throw new Error('Set WAVESPEED_API_KEY');

async function requestJson(url, options = {}) {
  const response = await fetch(url, options);
  if (!response.ok) throw new Error(await response.text());
  return response.json();
}

// 1. Submit the prediction.
const body = await requestJson(submitUrl, {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${apiKey}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
        "aspect_ratio": "16:9",
        "resolution": "720p",
        "enable_web_search": false,
        "generate_audio": true
}),
});
const task = body.data ?? body;
if (!task.id) throw new Error("Submission response did not contain a prediction id");
const resultUrl = `https://api.wavespeed.ai/api/v3/predictions/${task.id}/result`;

// 2. Poll until the prediction finishes.
while (true) {
  const resultBody = await requestJson(resultUrl, {
    headers: { "Authorization": `Bearer ${apiKey}` },
  });
  const result = resultBody.data ?? resultBody;
  if (result.status === "completed") {
    console.log(result.outputs);
    break;
  }
  if (["failed", "cancelled", "timeout", "deleted"].includes(result.status)) throw new Error(JSON.stringify(result));
  await new Promise(resolve => setTimeout(resolve, 2000));
}
Python example
import json
import os
import time
from urllib.request import Request, urlopen

api_key = os.environ["WAVESPEED_API_KEY"]
headers = {"Authorization": f"Bearer {api_key}", "Content-Type": "application/json"}
payload = {
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
    "aspect_ratio": "16:9",
    "resolution": "720p",
    "enable_web_search": False,
    "generate_audio": True
}

def request_json(url, data=None):
    request = Request(url, data=data, headers=headers, method="POST" if data else "GET")
    with urlopen(request) as response:
        return json.load(response)

# 1. Submit the prediction.
body = request_json("https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0-fast/video-edit", json.dumps(payload).encode())
task = body.get("data", body)
if not task.get("id"):
    raise RuntimeError("Submission response did not contain a prediction id")
result_url = f"https://api.wavespeed.ai/api/v3/predictions/{task['id']}/result"

# 2. Poll until the prediction finishes.
while True:
    result_body = request_json(result_url)
    result = result_body.get("data", result_body)
    status = result.get("status")
    if status == "completed":
        print(result.get("outputs", []))
        break
    if status in {"failed", "cancelled", "timeout", "deleted"}:
        raise RuntimeError(result)
    time.sleep(2)

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 result endpoint starting around every 2 seconds, increase the interval for long-running tasks, and stop on any terminal status. The playground generates production-oriented Python, JavaScript, and cURL examples with timeouts, transient-error handling, and safe GET retries. 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 long does Seedance 2.0 Fast Video Edit take to generate?

Median end-to-end generation time on WaveSpeedAI is around 208 seconds per request, based on recent successful runs. Queue time varies with global demand; live status is visible in the prediction record.

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.

Seedance 2.0 Fast Video Edit | AI Video Editing API on WaveSpeedAI