Hunyuan Video API for fast video generation. Text-to-video and video-to-video modes are supported.
The client provides a convenient way to interact with the model API.
npm install --save @fal-ai/clientThe @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.
Set FAL_KEY as an environment variable in your runtime.
export FAL_KEY="YOUR_API_KEY"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/hunyuan-video/video-to-video", {
input: {
prompt: "A stylish woman walks down a Tokyo street filled with warm glowing neon and animated city signage. She wears a dark blue leather jacket, a long pink dress, and bright yellow boots, and carries a black purse.",
video_url: "https://storage.googleapis.com/falserverless/hunyuan_video/hunyuan_v2v_input.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);The API uses an API Key for authentication. It is recommended you set the FAL_KEY environment variable in your runtime when possible.
import { fal } from "@fal-ai/client";
fal.config({
credentials: "YOUR_FAL_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.
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/hunyuan-video/video-to-video", {
input: {
prompt: "A stylish woman walks down a Tokyo street filled with warm glowing neon and animated city signage. She wears a dark blue leather jacket, a long pink dress, and bright yellow boots, and carries a black purse.",
video_url: "https://storage.googleapis.com/falserverless/hunyuan_video/hunyuan_v2v_input.mp4"
},
webhookUrl: "https://optional.webhook.url/for/results",
});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/hunyuan-video/video-to-video", {
requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b",
logs: true,
});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/hunyuan-video/video-to-video", {
requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b"
});
console.log(result.data);
console.log(result.requestId);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.
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.
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.
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);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.
prompt string* requiredThe prompt to generate the video from.
seed integerThe seed to use for generating the video.
pro_mode booleanBy default, generations are done with 35 steps. Pro mode does 55 steps which results in higher quality videos but will take more time and cost 2x more billing units.
aspect_ratio AspectRatio(W:H)EnumThe aspect ratio of the video to generate. Default value: "16:9"
Possible enum values: 16:9, 9:16
resolution ResolutionEnumThe resolution of the video to generate. Default value: "720p"
Possible enum values: 480p, 580p, 720p
num_frames NumberofFramesEnumThe number of frames to generate. Default value: "129"
Possible enum values: 129, 85
enable_safety_checker booleanIf set to true, the safety checker will be enabled. Disabling it requires account authorization; unauthorized requests are always checked.
video_url string* requiredURL of the video input.
strength floatStrength for Video-to-Video Default value: 0.85
{
"prompt": "A stylish woman walks down a Tokyo street filled with warm glowing neon and animated city signage. She wears a dark blue leather jacket, a long pink dress, and bright yellow boots, and carries a black purse.",
"aspect_ratio": "16:9",
"resolution": "720p",
"num_frames": 129,
"enable_safety_checker": true,
"video_url": "https://storage.googleapis.com/falserverless/hunyuan_video/hunyuan_v2v_input.mp4",
"strength": 0.85
}seed integer* requiredThe seed used for generating the video.
{
"video": {
"url": "https://v3.fal.media/files/kangaroo/y5-1YTGpun17eSeggZMzX_video-1733468228.mp4"
}
}url string* requiredThe URL where the file can be downloaded from.
content_type stringThe mime type of the file.
file_name stringThe name of the file. It will be auto-generated if not provided.
file_size integerThe size of the file in bytes.