V2.6 | Video to Video

wan/v2.6/reference-to-video/flash

Wan 2.6 reference-to-video flash model.

Inference

Commercial use

Partner

Schema

LLMs

Playground API

About

Generate a video using reference files (videos and/or images) with the faster R2V Flash model.

WAN 2.6 R2V Flash features:

10-20 seconds faster than standard R2V model
Reference up to 5 files total (videos + images) for character/subject consistency
Maximum 3 videos, maximum 5 images, total cannot exceed 5
Characters referenced as Character1, Character2, etc. in prompt
Resolution: 720p and 1080p
Duration: 5 or 10 seconds
Audio control: generate with or without audio
Multi-shot support with intelligent scene segmentation

Audio options:

enable_audio=True (default): Generate video with audio (half price of standard R2V)
enable_audio=False: Generate silent video (25% price of standard R2V)

Reference video requirements:

Format: mp4, mov
Quantity: 0-3 videos
Duration: 1-30 seconds each
File size: Up to 100MB each
FPS: At least 16 FPS

Reference image requirements:

Format: JPEG, JPG, PNG (no alpha), BMP, WEBP
Quantity: 0-5 images
Resolution: 240-5000 pixels
File size: Up to 10MB each

Reference ordering:

video_urls are numbered first (Character1, Character2...)
image_urls continue the sequence after videos
Example: 2 videos + 1 image = Character1 (video), Character2 (video), Character3 (image)

Prompt guidelines:

Use Character1, Character2, Character3 to reference subjects
Example: "Character1 sings on the roadside, Character2 dances beside them."

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("wan/v2.6/reference-to-video/flash", {
  input: {
    prompt: "Dance battle between Character1 and Character2."
  },
  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("wan/v2.6/reference-to-video/flash", {
  input: {
    prompt: "Dance battle between Character1 and Character2."
  },
  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("wan/v2.6/reference-to-video/flash", {
  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("wan/v2.6/reference-to-video/flash", {
  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

Use Character1, Character2, etc. to reference subjects from your reference files. Works for people, animals, or objects. For multi-shot prompts: '[0-3s] Shot 1. [3-6s] Shot 2.' Max 1500 characters. Reference order: video_urls first, then image_urls.

video_urls list<string>

Reference videos for subject consistency (0-3 videos). Videos' FPS must be at least 16 FPS. Combined with image_urls, total references cannot exceed 5. Reference order: video_urls are numbered first (Character1, Character2...), then image_urls continue the sequence.

image_urls list<string>

Reference images for subject consistency (0-5 images). Combined with video_urls, total references cannot exceed 5. Formats: JPEG, JPG, PNG (no alpha), BMP, WEBP. Resolution: 240-5000px. Max 10MB each. Reference order: image_urls continue numbering after video_urls.

aspect_ratio AspectRatioEnum

The aspect ratio of the generated video. Default value: "16:9"

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

resolution ResolutionEnum

Video resolution tier. R2V Flash only supports 720p and 1080p. Default value: "1080p"

Possible enum values: 720p, 1080p

duration DurationEnum

Duration of the generated video in seconds. R2V Flash supports only 5 or 10 seconds. Default value: "5"

Possible enum values: 5, 10

negative_prompt string

Negative prompt to describe content to avoid. Max 500 characters. Default value: ""

enable_prompt_expansion boolean

Whether to enable prompt rewriting using LLM. Default value: true

multi_shots boolean

When true (default), enables intelligent multi-shot segmentation for coherent narrative videos with multiple shots. When false, generates single continuous shot. Only active when enable_prompt_expansion is True. Default value: true

enable_audio boolean

Whether to generate a video with audio. Set to false for silent video generation. Silent videos are faster and cost 25% of the audio version price. Default value: true

seed integer

Random seed for reproducibility. If None, a random seed is chosen.

enable_safety_checker boolean

If set to true, the safety checker will be enabled. Default value: true

{
  "prompt": "Dance battle between Character1 and Character2.",
  "video_urls": [
    "https://v3b.fal.media/files/b/0a8d6d47/FtSBJGfZuivKfBIrRuWxa_video.mp4"
  ],
  "image_urls": [
    "https://v3b.fal.media/files/b/0a8d6d49/4XDgJcWQHLgkmUOL2JlPt_iXGPlm9y.png"
  ],
  "aspect_ratio": "16:9",
  "resolution": "1080p",
  "duration": "5",
  "negative_prompt": "low resolution, error, worst quality, low quality, defects",
  "enable_prompt_expansion": true,
  "multi_shots": true,
  "enable_audio": true,
  "enable_safety_checker": true
}

Output#

video VideoFile* required

The generated video file

seed integer* required

The seed used for generation

actual_prompt string

The actual prompt used if prompt rewriting was enabled

{
  "video": {
    "content_type": "video/mp4",
    "url": "https://v3b.fal.media/files/b/0a86762b/iDknfPkLFSFwWkyMgJi0U_QIzjwBDQ.mp4"
  },
  "seed": 175932751,
  "actual_prompt": "Dance battle between Character1 and Character2, cinematic lighting, dynamic camera movement."
}

Other types#

VideoFile#

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

width integer

The width of the video

height integer

The height of the video

fps float

The FPS of the video

duration float

The duration of the video

num_frames integer

The number of frames in the video

ImageSize#

width integer

The width of the generated image. Default value: 512

height integer

The height of the generated image. Default value: 512

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

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#

VideoFile#

ImageSize#

File#

Related Models

V2.6 Video 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#

VideoFile#

ImageSize#

File#

Related Models