Marketing
Video Replication
Generate a character variant from a source video, reference images, and optional voice.
POST
/
v3
/
agents
/
video-replication
Video Replication
curl --request POST \
--url https://api.darwin.so/api/v3/agents/video-replication \
--header 'Content-Type: application/json' \
--header 'Idempotency-Key: <idempotency-key>' \
--header 'x-api-key: <api-key>' \
--data '
{
"videoUrl": "https://media.example.com/source.mp4",
"characterImages": [
"https://media.example.com/character.png"
],
"instructions": "Use the new character, retaining the pacing and scene structure."
}
'import requests
url = "https://api.darwin.so/api/v3/agents/video-replication"
payload = {
"videoUrl": "https://media.example.com/source.mp4",
"characterImages": ["https://media.example.com/character.png"],
"instructions": "Use the new character, retaining the pacing and scene structure."
}
headers = {
"Idempotency-Key": "<idempotency-key>",
"x-api-key": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
'Idempotency-Key': '<idempotency-key>',
'x-api-key': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
videoUrl: 'https://media.example.com/source.mp4',
characterImages: ['https://media.example.com/character.png'],
instructions: 'Use the new character, retaining the pacing and scene structure.'
})
};
fetch('https://api.darwin.so/api/v3/agents/video-replication', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.darwin.so/api/v3/agents/video-replication",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'videoUrl' => 'https://media.example.com/source.mp4',
'characterImages' => [
'https://media.example.com/character.png'
],
'instructions' => 'Use the new character, retaining the pacing and scene structure.'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"Idempotency-Key: <idempotency-key>",
"x-api-key: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.darwin.so/api/v3/agents/video-replication"
payload := strings.NewReader("{\n \"videoUrl\": \"https://media.example.com/source.mp4\",\n \"characterImages\": [\n \"https://media.example.com/character.png\"\n ],\n \"instructions\": \"Use the new character, retaining the pacing and scene structure.\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Idempotency-Key", "<idempotency-key>")
req.Header.Add("x-api-key", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.darwin.so/api/v3/agents/video-replication")
.header("Idempotency-Key", "<idempotency-key>")
.header("x-api-key", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"videoUrl\": \"https://media.example.com/source.mp4\",\n \"characterImages\": [\n \"https://media.example.com/character.png\"\n ],\n \"instructions\": \"Use the new character, retaining the pacing and scene structure.\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.darwin.so/api/v3/agents/video-replication")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Idempotency-Key"] = '<idempotency-key>'
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"videoUrl\": \"https://media.example.com/source.mp4\",\n \"characterImages\": [\n \"https://media.example.com/character.png\"\n ],\n \"instructions\": \"Use the new character, retaining the pacing and scene structure.\"\n}"
response = http.request(request)
puts response.read_body{
"video": {
"url": "<string>",
"durationSeconds": 44,
"mimeType": "video/mp4"
}
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}Use a Darwin API key with
tools:execute. Send a source video, one to three character images, written instructions, and an optional authorized voice sample. Source and output videos are limited to 45 seconds. Keep the same Idempotency-Key when retrying the exact request.
See the Video Replication guide for preparing a character variant and reviewing the result.Authorizations
apiKeyapiKeyBearer
Headers
Reuse the same key only for an identical request.
Required string length:
1 - 200Body
application/json
Source MP4 or MOV video, up to 45 seconds.
Maximum string length:
2048Describe the requested changes and what should stay consistent.
Required string length:
1 - 4000One to three reference images of the same new character.
Required array length:
1 - 3 elementsMaximum string length:
2048Optional MP3 or WAV sample of the new character’s authorized voice.
Maximum string length:
2048Response
Generated video.
Show child attributes
Show child attributes
Last modified on October 19, 2026
⌘I
Video Replication
curl --request POST \
--url https://api.darwin.so/api/v3/agents/video-replication \
--header 'Content-Type: application/json' \
--header 'Idempotency-Key: <idempotency-key>' \
--header 'x-api-key: <api-key>' \
--data '
{
"videoUrl": "https://media.example.com/source.mp4",
"characterImages": [
"https://media.example.com/character.png"
],
"instructions": "Use the new character, retaining the pacing and scene structure."
}
'import requests
url = "https://api.darwin.so/api/v3/agents/video-replication"
payload = {
"videoUrl": "https://media.example.com/source.mp4",
"characterImages": ["https://media.example.com/character.png"],
"instructions": "Use the new character, retaining the pacing and scene structure."
}
headers = {
"Idempotency-Key": "<idempotency-key>",
"x-api-key": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
'Idempotency-Key': '<idempotency-key>',
'x-api-key': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
videoUrl: 'https://media.example.com/source.mp4',
characterImages: ['https://media.example.com/character.png'],
instructions: 'Use the new character, retaining the pacing and scene structure.'
})
};
fetch('https://api.darwin.so/api/v3/agents/video-replication', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.darwin.so/api/v3/agents/video-replication",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'videoUrl' => 'https://media.example.com/source.mp4',
'characterImages' => [
'https://media.example.com/character.png'
],
'instructions' => 'Use the new character, retaining the pacing and scene structure.'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"Idempotency-Key: <idempotency-key>",
"x-api-key: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.darwin.so/api/v3/agents/video-replication"
payload := strings.NewReader("{\n \"videoUrl\": \"https://media.example.com/source.mp4\",\n \"characterImages\": [\n \"https://media.example.com/character.png\"\n ],\n \"instructions\": \"Use the new character, retaining the pacing and scene structure.\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Idempotency-Key", "<idempotency-key>")
req.Header.Add("x-api-key", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.darwin.so/api/v3/agents/video-replication")
.header("Idempotency-Key", "<idempotency-key>")
.header("x-api-key", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"videoUrl\": \"https://media.example.com/source.mp4\",\n \"characterImages\": [\n \"https://media.example.com/character.png\"\n ],\n \"instructions\": \"Use the new character, retaining the pacing and scene structure.\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.darwin.so/api/v3/agents/video-replication")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Idempotency-Key"] = '<idempotency-key>'
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"videoUrl\": \"https://media.example.com/source.mp4\",\n \"characterImages\": [\n \"https://media.example.com/character.png\"\n ],\n \"instructions\": \"Use the new character, retaining the pacing and scene structure.\"\n}"
response = http.request(request)
puts response.read_body{
"video": {
"url": "<string>",
"durationSeconds": 44,
"mimeType": "video/mp4"
}
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}{
"code": "<string>",
"message": "<string>",
"supportEmail": "<string>"
}