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MODEL IDmirelo:1@1
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Mirelo SFX 1.5

Mirelo SFX 1.5 converts video into synchronized sound effects. It targets higher audio fidelity and wider scene coverage. It helps developers add context aware soundscapes to video pipelines with faster processing and flexible integration options.

Mirelo SFX 1.5

API Options

Platform-level options for task execution and delivery.

taskType

stringrequiredvalue: audioInference

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

Audio output type.

Allowed values3 values

outputFormat

stringdefault: MP3

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).
  • `MP3`: Compressed audio, smaller file size.
  • `WAV`: Uncompressed, high-quality audio.
  • `FLAC`: Lossless compression.
  • `OGG`: Open-source compressed audio format (Vorbis codec).
Allowed values7 values

audioSettings

object

Audio encoding settings for controlling the bitrate, number of channels, and sample rate of the generated audio. Only applicable for lossy output formats (MP3 and OGG). When using lossless formats (WAV or FLAC), this parameter must not be provided.

The available sample rates and valid bitrate ranges depend on the output format. For OGG, bitrate limits also vary by the number of channels.

MP3 bitrate limits

Bitrate limits for MP3 are the same regardless of mono or stereo.

Sample RateMin BitrateMax Bitrate
8,000 Hz8 kbps64 kbps
11,025 Hz8 kbps64 kbps
12,000 Hz8 kbps64 kbps
16,000 Hz8 kbps160 kbps
22,050 Hz8 kbps160 kbps
24,000 Hz8 kbps160 kbps
32,000 Hz32 kbps320 kbps
44,100 Hz32 kbps320 kbps
48,000 Hz32 kbps320 kbps
OGG bitrate limits — Mono (1 channel)
Sample RateMin BitrateMax Bitrate
8,000 Hz8 kbps40 kbps
12,000 Hz16 kbps48 kbps
16,000 Hz16 kbps96 kbps
24,000 Hz16 kbps80 kbps
48,000 Hz32 kbps224 kbps
OGG bitrate limits — Stereo (2 channels)
Sample RateMin BitrateMax Bitrate
8,000 Hz16 kbps80 kbps
12,000 Hz16 kbps96 kbps
16,000 Hz24 kbps192 kbps
24,000 Hz32 kbps160 kbps
48,000 Hz48 kbps256 kbps

Lossless formats: When outputFormat is set to WAV or FLAC, the audioSettings parameter is not available since these formats produce uncompressed or lossless audio with no configurable encoding settings.

Properties3 properties
audioSettings » bitrate

bitrate

integermin: 8

Audio bitrate in kbps.

audioSettings » channels

channels

integerdefault: 2

Number of audio channels. 1 for mono, 2 for stereo.

Allowed values2 values
audioSettings » sampleRate

sampleRate

integer

Audio sample rate in Hz.

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: sync

Determines how the API delivers task results.

Allowed values2 values
Returns complete results directly in the API response.
Returns an immediate acknowledgment with the task UUID. Poll for results using getResponse.
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.

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 » video

video

string

Video input (UUID or URL). Max 10 seconds.

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: mirelo:1@1

Identifier of the model to use for generation.

positivePrompt

stringmin: 2max: 3000

Text prompt describing elements to include in the generated output.

duration

floatmin: 1max: 10default: 10

Length of the generated audio track in seconds.

seed

integermin: 0max: 2147483647

Random seed for reproducible generation. When not provided, a random seed is generated in the unsigned 32-bit range.

steps

integermin: 5max: 30default: 25

Total number of denoising steps. Higher values generally produce more detailed results but take longer.

Settings

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

settings » startOffset

startOffset

integermin: 0max: 10

Start time offset in seconds within the input video.

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