Openjutsu Character Swap API

wavespeed-ai/openjutsu/character-swap

Genjutsu-style character swap: replace people in a video with characters from your pictures, keeping the scene, motion and original audio.

Video Editing
Input

Drag & drop or click to upload

Drag & drop or click to upload

preview
50% OFF

Idle

$0.05per run·~20 / $1

ExamplesView all

Related Models

README

Genjutsu Character Swap (OpenJutsu)

Genjutsu Character Swap (OpenJutsu) replaces people in a video with characters from your pictures. The scene, camera movement, performance and original audio are kept; only the people you choose change.

Why Choose This?

  • One picture, or several Give one picture and the most prominent person is replaced. Give up to four pictures, each with a short description of who it replaces ("the woman in black on the left"), and only those people are replaced; everyone else stays as filmed.

  • Performance preserved Body motion, timing and framing follow the source video, so the result stays in sync with the original sound.

  • Original audio kept The soundtrack of the source video is carried over to the result.

  • Up to 15 seconds The result follows the length of your video, up to 15 seconds. Longer videos use their first 15 seconds.

Parameters

ParameterRequiredDescription
videoYesURL of the source video, at least 2 seconds. Use a single shot with a person visible in the first frame. The result follows its length, up to 15 seconds.
imagesYesOne to four URLs of character pictures, one per person to replace.
rolesNoOne short description per picture, in the same order, of who it replaces, for example the woman in black on the left. Without roles the pictures go to the people in the order they appear in the video, or from left to right when they are on screen together. With one picture and no roles, the most prominent person is replaced.
resolutionNoOutput resolution: 480p, 540p, 768p or 1080p. Default: 768p.
seedNoRandom seed for generation. A negative value means a random seed will be used.

Tips

  • Use a source video with one continuous shot and a clearly visible person. Videos without a person are rejected.
  • Describe people by how they look or where they are, not by name. A picture nobody in the video matches is left out and the others are still made; if nobody matches any picture, the most prominent person is replaced by the first picture. The video must show a person.
  • Use one picture per person in the video you want to replace; people without a picture stay as they are.
  • Mirrors and reflections of the person are not supported.
  • The result can be slightly shorter than the selected part.

Pricing

Billing duration: The length of your input video is rounded up to whole seconds. The minimum billed duration is 3 seconds; shorter videos are billed as 3 seconds. Videos longer than 15 seconds are billed as 15 seconds, and only their first 15 seconds are used.

The price depends on the billed length and the resolution. Each character picture adds a flat fee.

ResolutionPrice per secondMax billed length
1080p0.40 USD15 s
768p0.20 USD15 s
540p0.17 USD15 s
480p0.15 USD15 s

A flat 0.02 USD is added for each character picture.

Billing rules

  • Billed duration = input video length rounded up to whole seconds, clamped to 3-15 seconds.
  • 1080p: 0.40 USD per billed second.
  • 768p: 0.20 USD per billed second.
  • 540p: 0.17 USD per billed second.
  • 480p: 0.15 USD per billed second. Lower resolutions are not proportionally cheaper: finding the people takes the same time at any size.
  • Total = billed seconds x rate per second + 0.02 USD x number of pictures.

The number of people replaced does not change the per-second rate. For example, with one picture:

  • 10 s video at 768p: 10 x 0.20 + 0.02 = 2.02 USD
  • 10 s video at 540p: 10 x 0.17 + 0.02 = 1.72 USD
  • 10 s video at 480p: 10 x 0.15 + 0.02 = 1.52 USD
  • 10 s video at 1080p: 10 x 0.40 + 0.02 = 4.02 USD
  • 15 s video at 768p: 15 x 0.20 + 0.02 = 3.02 USD
  • 2 s video at 768p (billed as 3 s): 3 x 0.20 + 0.02 = 0.62 USD
  • 30 s video at 768p (billed as 15 s): 3.02 USD
  • 10 s video at 768p with two pictures: 10 x 0.20 + 2 x 0.02 = 2.04 USD
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.

Openjutsu Character Swap API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/openjutsu/character-swap 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 Openjutsu Character Swap below.

HTTP example
set -euo pipefail

: "${WAVESPEED_API_KEY:?Set WAVESPEED_API_KEY}"

REQUEST_BODY=$(cat <<'JSON'
{
    "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
    "images": [
        "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg"
    ],
    "resolution": "768p"
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/openjutsu/character-swap" \
  -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/wavespeed-ai/openjutsu/character-swap";
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 ${apiKey}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
        "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
        "images": [
                "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg"
        ],
        "resolution": "768p"
}),
});
const task = body.data ?? body;
if (!task.id) throw new Error("Submission response did not contain a prediction id");
const resultUrl = `https://api.wavespeed.ai/api/v3/predictions/${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 = {
    "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
    "images": [
        "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg"
    ],
    "resolution": "768p"
}

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/wavespeed-ai/openjutsu/character-swap", 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)

Openjutsu Character Swap API — Frequently asked questions

What is the Openjutsu Character Swap API?

Openjutsu Character Swap is a WaveSpeedAI model for video editing, exposed as a REST API on WaveSpeedAI. Genjutsu-style character swap: replace people in a video with characters from your pictures, keeping the scene, motion and original audio. You can call it programmatically or try it from the playground above.

How do I call the Openjutsu Character Swap 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 Python, JavaScript, and cURL examples for submitting requests and polling results. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/wavespeed-ai/openjutsu-character-swap.

How much does Openjutsu Character Swap cost per run or per second?

Openjutsu Character Swap starts at $0.05 per run or per second. 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 Openjutsu Character Swap accept?

Key inputs: `images`, `video`, `resolution`, `seed`, `roles`. 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/wavespeed-ai/openjutsu-character-swap.

How do I get started with the Openjutsu Character Swap 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 Openjutsu Character Swap outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (WaveSpeedAI). Check the provider's applicable terms and WaveSpeedAI's Terms of Service before commercial use.

llms.txt — wavespeed-ai/openjutsu/character-swap for AI agents and LLMs