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MODEL IDskywork:skyreels@v4
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SkyReels V4

Skywork
by Skywork

SkyReels V4 is a unified multimodal video foundation model for joint video-audio generation, inpainting, and editing. It accepts text, images, video clips, masks, and audio references, and supports cinematic outputs up to 1080p, 32 FPS, and 15 seconds with synchronized audio, making it suitable for prompt-driven generation as well as guided editing workflows.

SkyReels V4

API Options

Platform-level options for task execution and delivery.

taskType

stringrequiredvalue: videoInference

Identifier for the type of task being performed

taskUUID

stringrequiredUUID v4

UUID v4 identifier for tracking tasks and matching async responses. Must be unique per task.

outputType

stringdefault: URL

Video output type.

Allowed values1 value

outputFormat

stringdefault: MP4

Specifies the file format of the generated output. The available values depend on the task type and the specific model's capabilities.

  • `MP4`: Widely supported video container (H.264), recommended for general use.
  • `WEBM`: Optimized for web delivery.
  • `MOV`: QuickTime format, common in professional workflows (Apple ecosystem).
Allowed values3 values

outputQuality

integermin: 20max: 99default: 95

Compression quality of the output. Higher values preserve quality but increase file size.

webhookURL

stringURI

Specifies a webhook URL where JSON responses will be sent via HTTP POST when generation tasks complete. For batch requests with multiple results, each completed item triggers a separate webhook call as it becomes available.

Learn more1 resource

deliveryMethod

stringdefault: async

Determines how the API delivers task results.

Allowed values1 value
Returns an immediate acknowledgment with the task UUID. Poll for results using getResponse. Required for long-running tasks like video generation.
Learn more1 resource

uploadEndpoint

stringURI

Specifies a URL where the generated content will be automatically uploaded using the HTTP PUT method. The raw binary data of the media file is sent directly as the request body. For secure uploads to cloud storage, use presigned URLs that include temporary authentication credentials.

Common use cases:

  • Cloud storage: Upload directly to S3 buckets, Google Cloud Storage, or Azure Blob Storage using presigned URLs.
  • CDN integration: Upload to content delivery networks for immediate distribution.
// S3 presigned URL for secure upload
https://your-bucket.s3.amazonaws.com/generated/content.mp4?X-Amz-Signature=abc123&X-Amz-Expires=3600

// Google Cloud Storage presigned URL
https://storage.googleapis.com/your-bucket/content.jpg?X-Goog-Signature=xyz789

// Custom storage endpoint
https://storage.example.com/uploads/generated-image.jpg

The content data will be sent as the request body to the specified URL when generation is complete.

safety

object

Content safety checking configuration for video generation.

Properties2 properties
safety » checkContent

checkContent

booleandefault: false

Enable or disable content safety checking.

safety » mode

mode

stringdefault: none

Safety checking mode for video generation.

Allowed values3 values
Disables checking.
Checks key frames.
Checks all frames.

ttl

integermin: 60

Time-to-live (TTL) in seconds for generated content. Only applies when outputType is URL.

includeCost

booleandefault: false

Include task cost in the response.

Inputs

Input resources for the task (images, audio, etc). These must be nested inside the inputs object.

inputs » referenceImages

referenceImages

array of objectsmin items: 1max items: 3

Reference image groups for subject, scene, style, or collage-based guidance. All items must share the same type.

Properties4 properties
inputs » referenceImages » type

type

stringrequired

Reference mode for this group.

Allowed values2 values
Single collage image.
Subject, scene, or style reference.
inputs » referenceImages » audio

audio

string

Audio input (UUID or URL). Voice timbre reference for lip-sync. Max 15 seconds.

inputs » referenceImages » images

images

array of stringsrequiredmin items: 1max items: 5

Image inputs (UUID, URL, Data URI, or Base64) for this reference group.

inputs » referenceImages » tag

tag

stringrequired

Group identifier that links this reference to a mention in the prompt. Must start with @ (e.g. @actor1, @style).

inputs » frameImages

frameImages

array of strings or objectsmin items: 1max items: 8

List of frame-specific image inputs. Each item can be either a plain image input (UUID, URL, Data URI, or Base64) or an object with an image and a target position in the video.

Format 1: string[]
string

Image input (UUID, URL, Data URI, or Base64).

Format 2: object[]2 properties
inputs » frameImages » image

image

stringrequired

Image input (UUID, URL, Data URI, or Base64).

inputs » frameImages » frame

frame

string | integer

Target frame position for the image. Accepts a named position like first or last, or a zero-based frame index (-1 for the last frame).

inputs » referenceVideos

referenceVideos

array of objectsitems: 1

Reference video for motion guidance, subject replacement, editing, or video extension.

Properties3 properties
inputs » referenceVideos » type

type

stringrequired

Reference mode for the video.

Allowed values2 values
Motion reference, subject replacement, or editing. Input video audio is carried to output.
Video extension.
inputs » referenceVideos » tag

tag

stringrequired

Video reference identifier that links to a mention in the prompt. Must start with @ (e.g. @video1).

inputs » referenceVideos » video

video

stringrequired

Video input (UUID or URL). Max 15 seconds. Minimum 1,866,240 total pixels (e.g. 1920×972).

Core Parameters

Primary parameters that define the task output.

numberResults

integermin: 1max: 4default: 1

Number of results to generate. Each result uses a different seed, producing variations of the same parameters.

model

stringrequiredvalue: skywork:skyreels@v4

Identifier of the model to use for generation.

positivePrompt

stringrequiredmax: 5120

Text prompt describing elements to include in the generated output.

width

integerrequired*paired with height

Width of the generated media in pixels.

height

integerrequired*paired with width

Height of the generated media in pixels.

resolution

stringdefault: 1080p

Resolution preset for the output. When used with input media, automatically matches the aspect ratio from the input.

Allowed values3 values

duration

floatmin: 3max: 15default: 5

Length of the generated video in seconds. The total number of frames produced is determined by duration multiplied by the model's frame rate (fps).

Settings

Technical parameters to fine-tune the inference process. These must be nested inside the settings object.

settings » audio

audio

boolean

Sound effect generation for the output video.

settings » promptExtend

promptExtend

booleandefault: true

Automatic prompt expansion and refinement via LLM for higher visual fidelity and alignment.

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