Stable Avatar | Audio to Video

fal-ai/stable-avatar

Stable Avatar generates audio-driven video avatars up to five minutes long

Inference

Commercial use

Schema

LLMs

Playground API

About

Generate a video from an audio file and an image.

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. Please check the migration guide for more information.

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("fal-ai/stable-avatar", {
  input: {
    image_url: "https://storage.googleapis.com/falserverless/example_inputs/stable-avatar-input-image.png",
    audio_url: "https://storage.googleapis.com/falserverless/example_inputs/stable-avatar-input-audio.mp3",
    prompt: "A person is in a relaxed pose. As the video progresses, the character speaks while arm and body movements are minimal and consistent with a natural speaking posture. Hand movements remain minimal. Don't blink too often. Preserve background integrity matching the reference image's spatial configuration, lighting conditions, and color temperature."
  },
  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 case your app is running in an environment where you cannot set environment variables, you can set the API Key manually as a client configuration.

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("fal-ai/stable-avatar", {
  input: {
    image_url: "https://storage.googleapis.com/falserverless/example_inputs/stable-avatar-input-image.png",
    audio_url: "https://storage.googleapis.com/falserverless/example_inputs/stable-avatar-input-audio.mp3",
    prompt: "A person is in a relaxed pose. As the video progresses, the character speaks while arm and body movements are minimal and consistent with a natural speaking posture. Hand movements remain minimal. Don't blink too often. Preserve background integrity matching the reference image's spatial configuration, lighting conditions, and color temperature."
  },
  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("fal-ai/stable-avatar", {
  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("fal-ai/stable-avatar", {
  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#

image_url string* required

The URL of the image to use as a reference for the video generation.

audio_url string* required

The URL of the audio to use as a reference for the video generation.

prompt string* required

The prompt to use for the video generation.

aspect_ratio AspectRatioEnum

The aspect ratio of the video to generate. If 'auto', the aspect ratio will be determined by the reference image. Default value: "auto"

Possible enum values: 16:9, 1:1, 9:16, auto

guidance_scale float

The guidance scale to use for the video generation. Default value: 5

audio_guidance_scale float

The audio guidance scale to use for the video generation. Default value: 4

num_inference_steps integer

The number of inference steps to use for the video generation. Default value: 50

seed integer

The seed to use for the video generation.

perturbation float

The amount of perturbation to use for the video generation. 0.0 means no perturbation, 1.0 means full perturbation. Default value: 0.1

{
  "image_url": "https://storage.googleapis.com/falserverless/example_inputs/stable-avatar-input-image.png",
  "audio_url": "https://storage.googleapis.com/falserverless/example_inputs/stable-avatar-input-audio.mp3",
  "prompt": "A person is in a relaxed pose. As the video progresses, the character speaks while arm and body movements are minimal and consistent with a natural speaking posture. Hand movements remain minimal. Don't blink too often. Preserve background integrity matching the reference image's spatial configuration, lighting conditions, and color temperature.",
  "aspect_ratio": "auto",
  "guidance_scale": 5,
  "audio_guidance_scale": 4,
  "num_inference_steps": 50,
  "perturbation": 0.1
}

Output#

video File* required

The generated video file.

{
  "video": "https://storage.googleapis.com/falserverless/example_outputs/stable-avatar-output.mp4"
}

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.

file_data string

File data

Stable Avatar Audio to Video

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#