API Reference
Midjourney Extend-Video
Use the extend video endpoint to create an asynchronous Task.
01
Overview
Use the extend video endpoint with the required inputs. Use the returned Task ID to retrieve its state, or provide callback_url for the deliveries documented below.
Quick start
- Create an API key and set it as RUNAPI_API_KEY.
- Send a POST request whose body matches the request schema.
- Store the returned task ID, then poll until a terminal state or handle the callbacks documented below.
Endpoint
- Base URL
https://runapi.ai- API version
v1- Authentication
Authorization: Bearer YOUR_API_TOKEN
02
Supported models
Open a model page for current pricing, rate limits, and commercial-usage details.
03
JSON bodyRequest schema
Send only the documented fields. When supplied, callback_url receives the Task deliveries documented below.
midjourney-image-to-video3 fields
callback_urlstring
Optional
promptstring
Optional
source_task_idstring
Required
04
HTTP 202Create acceptance
POST /api/v1/midjourney/extend_video
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"id": {
"type": "string"
},
"status": {
"enum": [
"processing"
],
"type": "string"
},
"task_replayed": {
"type": "boolean"
}
},
"required": [
"id",
"status",
"billing"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"billing": {
"refund": null,
"reservation": null,
"settlement": null
},
"id": "tsk_reference_demo",
"status": "processing"
}05
HTTP 200Polling processing
GET /api/v1/midjourney/extend_video/:id
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"id": {
"type": "string"
},
"progress": {
"type": "integer"
},
"status": {
"enum": [
"processing"
],
"type": "string"
}
},
"required": [
"id",
"status",
"billing"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"billing": {
"refund": null,
"reservation": null,
"settlement": null
},
"id": "tsk_reference_demo",
"status": "processing"
}06
HTTP 200Polling completed
GET /api/v1/midjourney/extend_video/:id
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"id": {
"type": "string"
},
"progress": {
"type": "integer"
},
"status": {
"enum": [
"completed"
],
"type": "string"
},
"video_id": {
"type": "string"
},
"videos": {
"items": {
"properties": {
"url": {
"type": "string"
}
},
"required": [
"url"
],
"type": "object",
"unevaluatedProperties": false
},
"type": "array"
}
},
"required": [
"id",
"status",
"videos",
"billing"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"billing": {
"refund": null,
"reservation": null,
"settlement": null
},
"id": "tsk_reference_demo",
"progress": 100,
"status": "completed",
"video_id": "midjourney-video-123",
"videos": [
{
"url": "https://cdn.runapi.ai/public/samples/video.mp4"
}
]
}07
HTTP 200Polling failed
GET /api/v1/midjourney/extend_video/:id
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"error": {
"type": "string"
},
"id": {
"type": "string"
},
"status": {
"enum": [
"failed"
],
"type": "string"
}
},
"required": [
"id",
"status",
"error",
"billing"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"billing": {
"refund": null,
"reservation": null,
"settlement": null
},
"error": "Task processing failed.",
"id": "tsk_reference_demo",
"status": "failed"
}08
HTTP 200Customer callback: completed
POST callback_url
Response schema
JSON
{
"properties": {
"id": {
"type": "string"
},
"progress": {
"type": "integer"
},
"status": {
"enum": [
"completed"
],
"type": "string"
},
"video_id": {
"type": "string"
},
"videos": {
"items": {
"properties": {
"url": {
"type": "string"
}
},
"required": [
"url"
],
"type": "object",
"unevaluatedProperties": false
},
"type": "array"
}
},
"required": [
"id",
"status",
"videos"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"id": "tsk_reference_demo",
"progress": 100,
"status": "completed",
"video_id": "midjourney-video-123",
"videos": [
{
"url": "https://cdn.runapi.ai/public/samples/video.mp4"
}
]
}09
HTTP 200Customer callback: failed
POST callback_url
Response schema
JSON
{
"properties": {
"error": {
"oneOf": [
{
"type": "string"
},
{
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
],
"type": "object",
"unevaluatedProperties": false
}
]
},
"id": {
"type": "string"
},
"status": {
"enum": [
"failed"
],
"type": "string"
}
},
"required": [
"id",
"status",
"error"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"error": {
"code": "generation_failed",
"message": "Task processing failed."
},
"id": "tsk_reference_demo",
"status": "failed"
}10
HTTP 401Errors
POST /api/v1/midjourney/extend_video
This response has no body.
11
HTTP 401Errors
GET /api/v1/midjourney/extend_video/:id
This response has no body.
12
HTTP 400Errors
POST /api/v1/midjourney/extend_video
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"error": {
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
],
"type": "object",
"unevaluatedProperties": false
}
},
"required": [
"error"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"error": {
"code": "source_task_id_is_required",
"message": "source_task_id is required"
}
}13
HTTP 402Errors
POST /api/v1/midjourney/extend_video
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"error": {
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
],
"type": "object",
"unevaluatedProperties": false
}
},
"required": [
"error"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"error": {
"code": "insufficient_balance",
"message": "Insufficient balance"
}
}14
HTTP 403Errors
POST /api/v1/midjourney/extend_video
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"error": {
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
],
"type": "object",
"unevaluatedProperties": false
}
},
"required": [
"error"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"error": {
"code": "api_token_credit_limit_exceeded",
"message": "API key credit limit exceeded"
}
}15
HTTP 409Errors
POST /api/v1/midjourney/extend_video
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"error": {
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
],
"type": "object",
"unevaluatedProperties": false
}
},
"required": [
"error"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"error": {
"code": "request_conflict",
"message": "The request uses features that are not supported for the selected model"
}
}16
HTTP 429Errors
POST /api/v1/midjourney/extend_video
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"error": {
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
],
"type": "object",
"unevaluatedProperties": false
}
},
"required": [
"error"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"error": {
"code": "rate_limited",
"message": "Rate limit reached. Please retry later."
}
}17
HTTP 503Errors
POST /api/v1/midjourney/extend_video
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"error": {
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
],
"type": "object",
"unevaluatedProperties": false
}
},
"required": [
"error"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"error": {
"code": "service_unavailable",
"message": "Service under maintenance, please try again later"
}
}18
HTTP 504Errors
POST /api/v1/midjourney/extend_video
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"error": {
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
],
"type": "object",
"unevaluatedProperties": false
}
},
"required": [
"error"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"billing": {
"refund": null,
"reservation": null,
"settlement": null
},
"error": {
"code": "timeout_error",
"message": "The request timed out"
}
}19
HTTP 404Errors
GET /api/v1/midjourney/extend_video/:id
Response schema
JSON
{
"properties": {
"billing": {
"properties": {
"refund": {
"oneOf": [
{
"properties": {
"refunded_at": {
"type": "string"
}
},
"required": [
"refunded_at"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"reservation": {
"oneOf": [
{
"properties": {
"amount_cents": {
"type": "integer"
}
},
"required": [
"amount_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
},
"settlement": {
"oneOf": [
{
"properties": {
"amount_micro_cents": {
"type": "integer"
},
"charged_amount_cents": {
"type": "integer"
}
},
"required": [
"charged_amount_cents",
"amount_micro_cents"
],
"type": "object",
"unevaluatedProperties": false
},
{
"enum": [
null
]
}
]
}
},
"required": [
"reservation",
"settlement",
"refund"
],
"type": "object",
"unevaluatedProperties": false
},
"error": {
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
],
"type": "object",
"unevaluatedProperties": false
}
},
"required": [
"error"
],
"type": "object",
"unevaluatedProperties": false
}Response example
JSON
{
"error": {
"code": "not_found",
"message": "Task with id 'tsk_reference_demo' not found"
}
}20
Generated Code Samples
Use cURL directly, or install an SDK for your language. Each sample submits the validated request shown in this reference.
CURL
curl -X POST https://runapi.ai/api/v1/midjourney/extend_video \
-H 'Authorization: Bearer YOUR_API_TOKEN' \
-H 'Content-Type: application/json' \
-d '{"source_task_id":"tsk_source_video","prompt":"Continue the camera movement into the sunset."}'Install
BASH
npm install @runapi.ai/midjourney
JAVASCRIPT
import { MidjourneyClient } from "@runapi.ai/midjourney";
const client = new MidjourneyClient({ apiKey: process.env.RUNAPI_API_KEY });
const task = await client.extendVideo.create({
"source_task_id": "tsk_source_video",
"prompt": "Continue the camera movement into the sunset."
});Install
BASH
pip install runapi-midjourney
PYTHON
import os
from runapi.midjourney import MidjourneyClient
client = MidjourneyClient(api_key=os.environ["RUNAPI_API_KEY"])
task = client.extend_video.create(
source_task_id="tsk_source_video",
prompt="Continue the camera movement into the sunset."
)Install
BASH
go get github.com/runapi-ai/midjourney-sdk/go@latest
GO
package main
import (
"context"
"log"
"os"
"github.com/runapi-ai/core-sdk/go/option"
midjourney "github.com/runapi-ai/midjourney-sdk/go/midjourney"
)
func main() {
client, err := midjourney.NewClient(option.WithAPIKey(os.Getenv("RUNAPI_API_KEY")))
if err != nil {
log.Fatal(err)
}
task, err := client.ExtendVideo.Create(context.Background(), midjourney.ExtendVideoParams{
SourceTaskID: "tsk_source_video",
Prompt: "Continue the camera movement into the sunset.",
})
if err != nil {
log.Fatal(err)
}
_ = task
}Install
BASH
gem install runapi-midjourney
RUBY
require "runapi/midjourney"
client = RunApi::Midjourney::Client.new(api_key: ENV.fetch("RUNAPI_API_KEY"))
task = client.extend_video.create(
source_task_id: "tsk_source_video",
prompt: "Continue the camera movement into the sunset."
)Install
KOTLIN
implementation("ai.runapi:runapi-midjourney")
JAVA
import ai.runapi.midjourney.MidjourneyClient;
import ai.runapi.midjourney.types.ExtendVideoParams;
import ai.runapi.core.polling.TaskCreateResponse;
public final class Example {
public static void main(String[] args) {
MidjourneyClient client = MidjourneyClient.builder()
.apiKey(System.getenv("RUNAPI_API_KEY"))
.build();
TaskCreateResponse task = client.extendVideo().create(
ExtendVideoParams.builder()
.sourceTaskId("tsk_source_video")
.prompt("Continue the camera movement into the sunset.")
.build()
);
}
}Install
BASH
composer require runapi-ai/midjourney
PHP
<?php
require __DIR__ . '/vendor/autoload.php';
use RunApi\Core\ClientOptions;
use RunApi\Midjourney\MidjourneyClient;
$client = new MidjourneyClient(new ClientOptions(apiKey: getenv('RUNAPI_API_KEY')));
$task = $client->extendVideo->create([
"source_task_id" => "tsk_source_video",
"prompt" => "Continue the camera movement into the sunset."
]);