US-hosted ByteDance Seedance 2.5 generates video with native audio from up to 30 images, 10 videos, and 10 audio references. Supports reference-guided generation, video editing, and extension at 480p, 720p or 1080p.

bytedance/seedance-2.5/us/reference-to-video

Learn more about Seedance 2.5

Inference

Commercial use

Partner

Schema

Playground API Examples

bytedance/seedance-2.5/us/reference-to-video

Schema

bytedance/seedance-2.5/us/reference-to-video

Learn more about Seedance 2.5

Inference

Commercial use

Partner

Schema

Playground API Examples

About

Us Reference To Video

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("bytedance/seedance-2.5/us/reference-to-video", {
  input: {},
  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("bytedance/seedance-2.5/us/reference-to-video", {
  input: {},
  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("bytedance/seedance-2.5/us/reference-to-video", {
  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("bytedance/seedance-2.5/us/reference-to-video", {
  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

The text prompt used to generate the video.

task TaskEnum

The type of video generation task. Reference uses the supplied media as guidance. Editing modifies a reference video and automatically coerces aspect_ratio and duration to auto. Extension continues a reference video and automatically coerces aspect_ratio to auto. Auto leaves the task type unset so the model decides it from the prompt and references. Default value: "reference"

Possible enum values: auto, reference, editing, extension

image_urls list<string>

Reference images to guide video generation. Refer to them in the prompt as @Image1, @Image2, etc. Supported formats: JPG, PNG, WebP, BMP, TIFF, GIF, HEIC, HEIF. Max 30 MB per image. Up to 30 images. Total files across all modalities must not exceed 50.

video_urls list<string>

Reference videos to guide video generation. Refer to them in the prompt as @Video1, @Video2, etc. Supported formats: MP4, MOV. Up to 10 videos. Each video must be 1.8 to 30.2 seconds and no larger than 200 MB; combined duration must not exceed 30.2 seconds. Dimensions must be 300 to 6,000 pixels per side, aspect ratio 0.4 to 2.5, and frame rate 24 to 60 FPS.

audio_urls list<string>

Reference audio to guide video generation. Refer to them in the prompt as @Audio1, @Audio2, etc. Supported formats: MP3, WAV. Up to 10 files. Each file must be 1.8 to 30.2 seconds and no larger than 15 MB; combined duration must not exceed 30.2 seconds.

resolution ResolutionEnum

Video resolution - 480p for faster generation, 720p for balance, 1080p for high quality. Default value: "720p"

Possible enum values: 480p, 720p, 1080p

duration DurationEnum

Duration of the video in seconds. Supports 4 to 30 seconds, or auto to let the model decide based on the prompt. Default value: "auto"

Possible enum values: auto, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30

aspect_ratio AspectRatioEnum

The aspect ratio of the generated video. Use 16:9 for landscape, 9:16 for portrait/vertical, 1:1 for square, 21:9 for ultrawide cinematic, or auto to let the model decide. Default value: "auto"

Possible enum values: auto, 21:9, 16:9, 4:3, 1:1, 3:4, 9:16

generate_audio boolean

Whether to generate synchronized audio for the video, including sound effects, ambient sounds, and lip-synced speech. The cost of video generation is the same regardless of whether audio is generated or not. Default value: true

bitrate_mode BitrateModeEnum

Output bitrate mode. 'high' requests a higher-quality, larger-file encode from the model; 'standard' uses the default bitrate. Default value: "standard"

Possible enum values: standard, high

codec CodecEnum

'auto' retains default video codec behaviour; 'H264' uses H.264; 'H265' uses H.265. Default value: "auto"

Possible enum values: auto, H264, H265

seed integer

Random seed for reproducibility. Note that results may still vary slightly even with the same seed.

end_user_id string

The unique user ID of the end user.

{
  "prompt": "An octopus finds a football in the ocean and excitedly calls its octopus friends to come and play. Cut scene to an octopus football game under the sea.",
  "task": "reference",
  "image_urls": [
    "https://v3b.fal.media/files/b/0a8eba37/Cqg-4Uwzyz4DELfceT1CF_a17e588773ec45b1a9e6f100a787b80b.jpg"
  ],
  "resolution": "720p",
  "duration": "auto",
  "aspect_ratio": "auto",
  "generate_audio": true,
  "bitrate_mode": "standard",
  "codec": "auto"
}

Output#

video File* required

The generated video file.

seed integer* required

The seed used for generation.

draft_id string

The draft ID, or null when draft mode is disabled. Complete this draft within 14 days using the same account.

{
  "video": {
    "url": "https://storage.googleapis.com/falserverless/example_outputs/bytedance/seedance_2/output.mp4"
  },
  "seed": 42
}

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

About

Us Reference To Video

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("bytedance/seedance-2.5/us/reference-to-video", {
  input: {},
  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("bytedance/seedance-2.5/us/reference-to-video", {
  input: {},
  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("bytedance/seedance-2.5/us/reference-to-video", {
  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("bytedance/seedance-2.5/us/reference-to-video", {
  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

The text prompt used to generate the video.

task TaskEnum

Possible enum values: auto, reference, editing, extension

image_urls list<string>

video_urls list<string>

audio_urls list<string>

resolution ResolutionEnum

Video resolution - 480p for faster generation, 720p for balance, 1080p for high quality. Default value: "720p"

Possible enum values: 480p, 720p, 1080p

duration DurationEnum

Duration of the video in seconds. Supports 4 to 30 seconds, or auto to let the model decide based on the prompt. Default value: "auto"

Possible enum values: auto, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30

aspect_ratio AspectRatioEnum

The aspect ratio of the generated video. Use 16:9 for landscape, 9:16 for portrait/vertical, 1:1 for square, 21:9 for ultrawide cinematic, or auto to let the model decide. Default value: "auto"

Possible enum values: auto, 21:9, 16:9, 4:3, 1:1, 3:4, 9:16

generate_audio boolean

bitrate_mode BitrateModeEnum

Output bitrate mode. 'high' requests a higher-quality, larger-file encode from the model; 'standard' uses the default bitrate. Default value: "standard"

Possible enum values: standard, high

codec CodecEnum

'auto' retains default video codec behaviour; 'H264' uses H.264; 'H265' uses H.265. Default value: "auto"

Possible enum values: auto, H264, H265

seed integer

Random seed for reproducibility. Note that results may still vary slightly even with the same seed.

end_user_id string

The unique user ID of the end user.

{
  "prompt": "An octopus finds a football in the ocean and excitedly calls its octopus friends to come and play. Cut scene to an octopus football game under the sea.",
  "task": "reference",
  "image_urls": [
    "https://v3b.fal.media/files/b/0a8eba37/Cqg-4Uwzyz4DELfceT1CF_a17e588773ec45b1a9e6f100a787b80b.jpg"
  ],
  "resolution": "720p",
  "duration": "auto",
  "aspect_ratio": "auto",
  "generate_audio": true,
  "bitrate_mode": "standard",
  "codec": "auto"
}

Output#

video File* required

The generated video file.

seed integer* required

The seed used for generation.

draft_id string

The draft ID, or null when draft mode is disabled. Complete this draft within 14 days using the same account.

{
  "video": {
    "url": "https://storage.googleapis.com/falserverless/example_outputs/bytedance/seedance_2/output.mp4"
  },
  "seed": 42
}

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

Seedance 2.5 US Reference to Video Image to Video API Docs | fal

bytedance/seedance-2.5/us/reference-to-video

Table of contents

Table of contents

bytedance/seedance-2.5/us/reference-to-video

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

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