Marey Realism V1.5 Video to Video API Docs | fal

Pull motion from a reference video and apply it to new subjects or scenes.

moonvalley/marey/motion-transfer

Pull motion from a reference video and apply it to new subjects or scenes.

Inference

Commercial use

Schema

LLMs

Playground API

About

Motion Transfer Endpoint

1. Calling the API#

Install the client#

The client provides a convenient way to interact with the model API.

npm install --save @fal-ai/client

Migrate to @fal-ai/client

The @fal-ai/serverless-client package has been deprecated in favor of @fal-ai/client. Install the new package and update your imports — see client setup.

Setup your API Key#

Set FAL_KEY as an environment variable in your runtime.

export FAL_KEY="YOUR_API_KEY"

Submit a request#

The client API handles the API submit protocol. It will handle the request status updates and return the result when the request is completed.

import { fal } from "@fal-ai/client";

const result = await fal.subscribe("moonvalley/marey/motion-transfer", {
  input: {
    prompt: "Detailed Description: A fast, smooth dolly shot glides forward at water level through a monumental, minimalist colonnade. The imposing, symmetrical rows of brutalist marble columns rush past on either side, their strong vertical lines creating a sense of powerful, constant motion. The dark, glassy water of a central pool perfectly reflects the towering structures, with gentle ripples disturbing the mirror image as the camera advances. The scene is cinematic and moody, with the light-colored stone contrasting against the dark water and the pale sky visible at the far end of the architectural tunnel. shot on 35mm, film, organic, analog, motion blur

  Background: A pale, overcast sky and a distant treeline are framed by the opening at the end of the colonnade, growing larger as the camera moves forward.

  Middleground: The two rows of massive, geometric columns recede into the distance, their uniform shapes creating a hypnotic, rhythmic pattern that rushes past the lens.

  Foreground: The camera skims just above the surface of the dark, rippling water, which reflects the blurred motion of the columns passing on the left and right.",
    video_url: "https://d1kaxrqq3vfrw5.cloudfront.net/fal-launch-assets/guide-assets/fal-motion-transfer-input-5s.mp4"
  },
  logs: true,
  onQueueUpdate: (update) => {
    if (update.status === "IN_PROGRESS") {
      update.logs.map((log) => log.message).forEach(console.log);
    }
  },
});
console.log(result.data);
console.log(result.requestId);

2. Authentication#

The API uses an API Key for authentication. It is recommended you set the FAL_KEY environment variable in your runtime when possible.

API Key#

In an environment where you cannot set environment variables, you can configure the API key manually on the client.

import { fal } from "@fal-ai/client";

fal.config({
  credentials: "YOUR_FAL_KEY"
});

Protect your API Key

When running code on the client-side (e.g. in a browser, mobile app or GUI applications), make sure to not expose your FAL_KEY. Instead, use a server-side proxy to make requests to the API. For more information, check out our server-side integration guide.

3. Queue#

Long-running requests

For long-running requests, such as training jobs or models with slower inference times, it is recommended to check the Queue status and rely on Webhooks instead of blocking while waiting for the result.

Submit a request#

The client API provides a convenient way to submit requests to the model.

import { fal } from "@fal-ai/client";

const { request_id } = await fal.queue.submit("moonvalley/marey/motion-transfer", {
  input: {
    prompt: "Detailed Description: A fast, smooth dolly shot glides forward at water level through a monumental, minimalist colonnade. The imposing, symmetrical rows of brutalist marble columns rush past on either side, their strong vertical lines creating a sense of powerful, constant motion. The dark, glassy water of a central pool perfectly reflects the towering structures, with gentle ripples disturbing the mirror image as the camera advances. The scene is cinematic and moody, with the light-colored stone contrasting against the dark water and the pale sky visible at the far end of the architectural tunnel. shot on 35mm, film, organic, analog, motion blur

  Background: A pale, overcast sky and a distant treeline are framed by the opening at the end of the colonnade, growing larger as the camera moves forward.

  Middleground: The two rows of massive, geometric columns recede into the distance, their uniform shapes creating a hypnotic, rhythmic pattern that rushes past the lens.

  Foreground: The camera skims just above the surface of the dark, rippling water, which reflects the blurred motion of the columns passing on the left and right.",
    video_url: "https://d1kaxrqq3vfrw5.cloudfront.net/fal-launch-assets/guide-assets/fal-motion-transfer-input-5s.mp4"
  },
  webhookUrl: "https://optional.webhook.url/for/results",
});

Fetch request status#

You can fetch the status of a request to check if it is completed or still in progress.

import { fal } from "@fal-ai/client";

const status = await fal.queue.status("moonvalley/marey/motion-transfer", {
  requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b",
  logs: true,
});

Get the result#

Once the request is completed, you can fetch the result. See the Output Schema for the expected result format.

import { fal } from "@fal-ai/client";

const result = await fal.queue.result("moonvalley/marey/motion-transfer", {
  requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b"
});
console.log(result.data);
console.log(result.requestId);

4. Files#

Some attributes in the API accept file URLs as input. Whenever that's the case you can pass your own URL or a Base64 data URI.

Data URI (base64)#

You can pass a Base64 data URI as a file input. The API will handle the file decoding for you. Keep in mind that for large files, this alternative although convenient can impact the request performance.

Hosted files (URL)#

You can also pass your own URLs as long as they are publicly accessible. Be aware that some hosts might block cross-site requests, rate-limit, or consider the request as a bot.

Uploading files#

We provide a convenient file storage that allows you to upload files and use them in your requests. You can upload files using the client API and use the returned URL in your requests.

import { fal } from "@fal-ai/client";

const file = new File(["Hello, World!"], "hello.txt", { type: "text/plain" });
const url = await fal.storage.upload(file);

Auto uploads

The client will auto-upload the file for you if you pass a binary object (e.g. File, Data).

Read more about file handling in our file upload guide.

5. Schema#

Input#

prompt string* required

The prompt to generate a video from

video_url string* required

The URL of the video to use as the control video.

first_frame_image_url string

Optional first frame image URL to use as the first frame of the generated video Default value: "https://video-editor-files-prod.s3.us-east-2.amazonaws.com/users/1e4d46df-0702-4491-95ce-763592f33f34/uploaded-images/9b9dce1c-abd0-46c0-bac9-9454f8893b06/original"

reference_image_url string

Optional reference image URL to use for pose control or as a starting frame

negative_prompt string

Negative prompt used to guide the model away from undesirable features. Default value: "<synthetic> <scene cut> low-poly, flat shader, bad rigging, stiff animation, uncanny eyes, low-quality textures, looping glitch, cheap effect, overbloom, bloom spam, default lighting, game asset, stiff face, ugly specular, AI artifacts"

seed integer

Seed for random number generation. Use -1 for random seed each run. Default value: -1

{
  "prompt": "Detailed Description: A fast, smooth dolly shot glides forward at water level through a monumental, minimalist colonnade. The imposing, symmetrical rows of brutalist marble columns rush past on either side, their strong vertical lines creating a sense of powerful, constant motion. The dark, glassy water of a central pool perfectly reflects the towering structures, with gentle ripples disturbing the mirror image as the camera advances. The scene is cinematic and moody, with the light-colored stone contrasting against the dark water and the pale sky visible at the far end of the architectural tunnel. shot on 35mm, film, organic, analog, motion blur\n\nBackground: A pale, overcast sky and a distant treeline are framed by the opening at the end of the colonnade, growing larger as the camera moves forward.\n\nMiddleground: The two rows of massive, geometric columns recede into the distance, their uniform shapes creating a hypnotic, rhythmic pattern that rushes past the lens.\n\nForeground: The camera skims just above the surface of the dark, rippling water, which reflects the blurred motion of the columns passing on the left and right.",
  "video_url": "https://d1kaxrqq3vfrw5.cloudfront.net/fal-launch-assets/guide-assets/fal-motion-transfer-input-5s.mp4",
  "first_frame_image_url": "https://video-editor-files-prod.s3.us-east-2.amazonaws.com/users/1e4d46df-0702-4491-95ce-763592f33f34/uploaded-images/9b9dce1c-abd0-46c0-bac9-9454f8893b06/original",
  "negative_prompt": "<synthetic> <scene cut> low-poly, flat shader, bad rigging, stiff animation, uncanny eyes, low-quality textures, looping glitch, cheap effect, overbloom, bloom spam, default lighting, game asset, stiff face, ugly specular, AI artifacts",
  "seed": -1
}

Output#

video File* required

The generated video.

{
  "video": {
    "url": "",
    "content_type": "image/png",
    "file_name": "z9RV14K95DvU.png",
    "file_size": 4404019
  }
}

Other types#

File#

url string* required

The URL where the file can be downloaded from.

content_type string

The mime type of the file.

file_name string

The name of the file. It will be auto-generated if not provided.

file_size integer

The size of the file in bytes.

Related Models

1. Calling the API

2. Authentication

API Key

3. Queue

4. Files

5. Schema

About

Motion Transfer Endpoint

1. Calling the API#

Install the client#

The client provides a convenient way to interact with the model API.

npm install --save @fal-ai/client

Migrate to @fal-ai/client

The @fal-ai/serverless-client package has been deprecated in favor of @fal-ai/client. Install the new package and update your imports — see client setup.

Setup your API Key#

Set FAL_KEY as an environment variable in your runtime.

export FAL_KEY="YOUR_API_KEY"

Submit a request#

The client API handles the API submit protocol. It will handle the request status updates and return the result when the request is completed.

import { fal } from "@fal-ai/client";

const result = await fal.subscribe("moonvalley/marey/motion-transfer", {
  input: {
    prompt: "Detailed Description: A fast, smooth dolly shot glides forward at water level through a monumental, minimalist colonnade. The imposing, symmetrical rows of brutalist marble columns rush past on either side, their strong vertical lines creating a sense of powerful, constant motion. The dark, glassy water of a central pool perfectly reflects the towering structures, with gentle ripples disturbing the mirror image as the camera advances. The scene is cinematic and moody, with the light-colored stone contrasting against the dark water and the pale sky visible at the far end of the architectural tunnel. shot on 35mm, film, organic, analog, motion blur

  Background: A pale, overcast sky and a distant treeline are framed by the opening at the end of the colonnade, growing larger as the camera moves forward.

  Middleground: The two rows of massive, geometric columns recede into the distance, their uniform shapes creating a hypnotic, rhythmic pattern that rushes past the lens.

  Foreground: The camera skims just above the surface of the dark, rippling water, which reflects the blurred motion of the columns passing on the left and right.",
    video_url: "https://d1kaxrqq3vfrw5.cloudfront.net/fal-launch-assets/guide-assets/fal-motion-transfer-input-5s.mp4"
  },
  logs: true,
  onQueueUpdate: (update) => {
    if (update.status === "IN_PROGRESS") {
      update.logs.map((log) => log.message).forEach(console.log);
    }
  },
});
console.log(result.data);
console.log(result.requestId);

2. Authentication#

The API uses an API Key for authentication. It is recommended you set the FAL_KEY environment variable in your runtime when possible.

API Key#

In an environment where you cannot set environment variables, you can configure the API key manually on the client.

import { fal } from "@fal-ai/client";

fal.config({
  credentials: "YOUR_FAL_KEY"
});

Protect your API Key

3. Queue#

Long-running requests

Submit a request#

The client API provides a convenient way to submit requests to the model.

import { fal } from "@fal-ai/client";

const { request_id } = await fal.queue.submit("moonvalley/marey/motion-transfer", {
  input: {
    prompt: "Detailed Description: A fast, smooth dolly shot glides forward at water level through a monumental, minimalist colonnade. The imposing, symmetrical rows of brutalist marble columns rush past on either side, their strong vertical lines creating a sense of powerful, constant motion. The dark, glassy water of a central pool perfectly reflects the towering structures, with gentle ripples disturbing the mirror image as the camera advances. The scene is cinematic and moody, with the light-colored stone contrasting against the dark water and the pale sky visible at the far end of the architectural tunnel. shot on 35mm, film, organic, analog, motion blur

  Background: A pale, overcast sky and a distant treeline are framed by the opening at the end of the colonnade, growing larger as the camera moves forward.

  Middleground: The two rows of massive, geometric columns recede into the distance, their uniform shapes creating a hypnotic, rhythmic pattern that rushes past the lens.

  Foreground: The camera skims just above the surface of the dark, rippling water, which reflects the blurred motion of the columns passing on the left and right.",
    video_url: "https://d1kaxrqq3vfrw5.cloudfront.net/fal-launch-assets/guide-assets/fal-motion-transfer-input-5s.mp4"
  },
  webhookUrl: "https://optional.webhook.url/for/results",
});

Fetch request status#

You can fetch the status of a request to check if it is completed or still in progress.

import { fal } from "@fal-ai/client";

const status = await fal.queue.status("moonvalley/marey/motion-transfer", {
  requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b",
  logs: true,
});

Get the result#

Once the request is completed, you can fetch the result. See the Output Schema for the expected result format.

import { fal } from "@fal-ai/client";

const result = await fal.queue.result("moonvalley/marey/motion-transfer", {
  requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b"
});
console.log(result.data);
console.log(result.requestId);

4. Files#

Some attributes in the API accept file URLs as input. Whenever that's the case you can pass your own URL or a Base64 data URI.

Data URI (base64)#

Hosted files (URL)#

You can also pass your own URLs as long as they are publicly accessible. Be aware that some hosts might block cross-site requests, rate-limit, or consider the request as a bot.

Uploading files#

We provide a convenient file storage that allows you to upload files and use them in your requests. You can upload files using the client API and use the returned URL in your requests.

import { fal } from "@fal-ai/client";

const file = new File(["Hello, World!"], "hello.txt", { type: "text/plain" });
const url = await fal.storage.upload(file);

Auto uploads

The client will auto-upload the file for you if you pass a binary object (e.g. File, Data).

Read more about file handling in our file upload guide.

5. Schema#

Input#

prompt string* required

The prompt to generate a video from

video_url string* required

The URL of the video to use as the control video.

first_frame_image_url string

reference_image_url string

Optional reference image URL to use for pose control or as a starting frame

negative_prompt string

seed integer

Seed for random number generation. Use -1 for random seed each run. Default value: -1

{
  "prompt": "Detailed Description: A fast, smooth dolly shot glides forward at water level through a monumental, minimalist colonnade. The imposing, symmetrical rows of brutalist marble columns rush past on either side, their strong vertical lines creating a sense of powerful, constant motion. The dark, glassy water of a central pool perfectly reflects the towering structures, with gentle ripples disturbing the mirror image as the camera advances. The scene is cinematic and moody, with the light-colored stone contrasting against the dark water and the pale sky visible at the far end of the architectural tunnel. shot on 35mm, film, organic, analog, motion blur\n\nBackground: A pale, overcast sky and a distant treeline are framed by the opening at the end of the colonnade, growing larger as the camera moves forward.\n\nMiddleground: The two rows of massive, geometric columns recede into the distance, their uniform shapes creating a hypnotic, rhythmic pattern that rushes past the lens.\n\nForeground: The camera skims just above the surface of the dark, rippling water, which reflects the blurred motion of the columns passing on the left and right.",
  "video_url": "https://d1kaxrqq3vfrw5.cloudfront.net/fal-launch-assets/guide-assets/fal-motion-transfer-input-5s.mp4",
  "first_frame_image_url": "https://video-editor-files-prod.s3.us-east-2.amazonaws.com/users/1e4d46df-0702-4491-95ce-763592f33f34/uploaded-images/9b9dce1c-abd0-46c0-bac9-9454f8893b06/original",
  "negative_prompt": "<synthetic> <scene cut> low-poly, flat shader, bad rigging, stiff animation, uncanny eyes, low-quality textures, looping glitch, cheap effect, overbloom, bloom spam, default lighting, game asset, stiff face, ugly specular, AI artifacts",
  "seed": -1
}

Output#

video File* required

The generated video.

{
  "video": {
    "url": "",
    "content_type": "image/png",
    "file_name": "z9RV14K95DvU.png",
    "file_size": 4404019
  }
}

Other types#

File#

url string* required

The URL where the file can be downloaded from.

content_type string

The mime type of the file.

file_name string

The name of the file. It will be auto-generated if not provided.

file_size integer

The size of the file in bytes.

moonvalley/marey/motion-transfer

Table of contents

Table of contents

moonvalley/marey/motion-transfer

Table of contents

1. Calling the API

2. Authentication

3. Queue

4. Files

5. Schema

About

1. Calling the API#

Install the client#

Migrate to @fal-ai/client

Setup your API Key#

Submit a request#

2. Authentication#

API Key#

Protect your API Key

3. Queue#

Long-running requests

Submit a request#

Fetch request status#

Get the result#

4. Files#

Data URI (base64)#

Hosted files (URL)#

Uploading files#

Auto uploads

5. Schema#

Input#

Output#

Other types#

File#

Related Models

Table of contents

Table of contents

1. Calling the API

2. Authentication

3. Queue

4. Files

5. Schema

About

1. Calling the API#

Install the client#

Migrate to @fal-ai/client

Setup your API Key#

Submit a request#

2. Authentication#

API Key#

Protect your API Key

3. Queue#

Long-running requests

Submit a request#

Fetch request status#

Get the result#

4. Files#

Data URI (base64)#

Hosted files (URL)#

Uploading files#

Auto uploads

5. Schema#

Input#

Output#

Other types#

File#

Related Models