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MODEL IDbfl:flux@video-edit-fast
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FLUX Video Edit [fast]

Black Forest Labs
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FLUX Video Edit [fast] is Black Forest Labs' instruction-based video editing model for changing an existing clip with a natural-language prompt. It can add, remove, or replace objects and characters; alter settings, styles, actions, and on-screen text; and revise or translate dialogue while preserving unedited motion, camera work, timing, framing, and audio. It supports source clips up to 15 seconds and produces 24 FPS output at up to 720p while retaining the original duration and aspect ratio.

FLUX Video Edit [fast]

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

boolean

Enable or disable content safety checking. Increases total generation time.

safety » mode

mode

stringdefault: fast

Safety checking mode for video generation.

Allowed values2 values
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

boolean

Include task cost in the response.

numberResults

integermin: 1max: 4default: 1

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

Inputs

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

inputs » video

video

stringrequired3 limits

Video input (UUID or URL). The output keeps the source duration, aspect ratio and audio, at 24 fps. A source above 720p is downscaled to 720p.

Core Parameters

Primary parameters that define the task output.

model

stringrequiredvalue: bfl:flux@video-edit-fast

Identifier of the model to use for generation.

Learn more3 resources

positivePrompt

stringrequiredmin: 1max: 4096

Text prompt describing elements to include in the generated output.

Learn more1 resource

Settings

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

settings » safetyTolerance

safetyTolerance

integermin: 0max: 4default: 2

Tolerance level for content moderation. Lower values are stricter; higher values are more permissive.

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