falAudio to audioComing soon

fal-ai/stable-audio-3/small/sfx/base/audio-outpainting

Name: fal-ai/stable-audio-3/small/sfx/base/audio-outpainting
Brand: fal

fal-ai/stable-audio-3/small/sfx/base/audio-outpainting is an audio to audio tool from fal that runs in the background and returns audio. Coming soon: listed with its price, not yet open to runs.

This tool is listed but not yet available to run.

Priced by usage

Pricing

$0.04381 per audio file. The final charge comes from usage.

Limits

Runs: In the background
Returns: audio
Longest queue wait: 3600s
Run deadline: 1800s
Largest inline input: 1024 KB
Largest input file: 500 MB
Largest output: 4768 MB
Outputs per run: 16

Input

Field	Kind	Default	Description
`negative_prompt`	text		Text description of qualities to avoid in the output.
`num_inference_steps`	number (whole) 1 to 100	50	Number of sampling steps. Base (non-distilled) checkpoints typically need ~50 for good quality.
`guidance_scale`	number 0 to 25	7	Classifier-free guidance scale. Higher values follow the prompt more strictly; ~7.0 is a good starting point for base checkpoints.
`seed`	number (whole)	—	Random seed for reproducible outputs. Omit for a random seed.
`enable_prompt_expansion`	true or false	false	If True, the prompt will be expanded using an LLM for more detailed and higher quality results.
`output_format`	one of mp3, wav, flac, ogg, opus, m4a, aac	mp3	Container format for the generated audio output.
`bitrate`	text	192k	Audio bitrate for compressed output formats (e.g., mp3, aac, opus). Format e.g. '192k' or '320k'. Ignored for lossless formats (wav, flac).
`prompt` required	text	—	Text description guiding the extension content.
`audio_url` required	URL or file	—	Source audio to extend.
`extend_seconds_before`	number 0 to 120	0	Seconds of new audio to generate before the source audio.
`extend_seconds_after`	number 0 to 120	0	Seconds of new audio to generate after the source audio.

Same request in code

curl https://api.spiral.ai/v1/runs \
  -H "Authorization: Bearer $SPIRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "provider": "fal",
    "model": "fal-ai/stable-audio-3/small/sfx/base/audio-outpainting",
    "input": {
      "prompt": "soft strings continue the melody",
      "audio_url": "https://storage.googleapis.com/falserverless/model_tests/diffrythm/rock_en.wav"
    }
  }'