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Scale/resize a video to specific dimensions.
Three modes are available:
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/workflow-utilities/scale-video", {
input: {
video_url: "https://storage.googleapis.com/falserverless/example_outputs/wan-25-i2v-output.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/workflow-utilities/scale-video", {
input: {
video_url: "https://storage.googleapis.com/falserverless/example_outputs/wan-25-i2v-output.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/workflow-utilities/scale-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/workflow-utilities/scale-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.
video_url string* requiredURL of the video file to scale/resize. Height and Width of the video must be even numbers for compatibility with video codecs.
width integerTarget width in pixels. If only width is provided, height is auto-calculated to preserve aspect ratio. At least one of width or height must be provided.
height integerTarget height in pixels. If only height is provided, width is auto-calculated to preserve aspect ratio. At least one of width or height must be provided.
mode ModeEnumScaling mode. 'stretch' scales the video to the exact target dimensions (may distort aspect ratio). 'pad' scales to fit within the target dimensions while preserving aspect ratio, then pads with the chosen color to fill the remaining space (letterbox/pillarbox). 'crop' scales to cover the target dimensions while preserving aspect ratio, then center-crops to the exact target size. Default value: "stretch"
Possible enum values: stretch, pad, crop
pad_color PadColorEnumPadding color when mode is 'pad'. Ignored for other modes. Default value: "black"
Possible enum values: black, white, red, green, blue, gray
codec CodecEnumVideo codec to use for encoding. libx264 (H.264) is widely compatible, libx265 (H.265/HEVC) offers better compression. Default value: "libx264"
Possible enum values: libx264, libx265
preset PresetEnumEncoding speed preset. Slower presets give better compression but take longer. Default value: "fast"
Possible enum values: ultrafast, fast, medium, slow
crf integerConstant Rate Factor for quality (0-51). Lower values mean better quality and larger files. 18 is visually lossless for most content. Default value: 18
{
"video_url": "https://storage.googleapis.com/falserverless/example_outputs/wan-25-i2v-output.mp4",
"width": 1920,
"height": 1080,
"mode": "stretch",
"pad_color": "black",
"codec": "libx264",
"preset": "fast",
"crf": 18
}The scaled/resized video
original_width integer* requiredWidth of the original video in pixels
original_height integer* requiredHeight of the original video in pixels
scaled_width integer* requiredWidth of the output video in pixels
scaled_height integer* requiredHeight of the output video in pixels
{
"video": {
"url": "https://v3b.fal.media/files/b/monkey/scaled_output.mp4",
"file_name": "output.mp4",
"content_type": "video/mp4",
"file_size": 3456789
},
"original_width": 1929,
"original_height": 1082,
"scaled_width": 1920,
"scaled_height": 1080
}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.