GET

/v1/schemas/fal/audio/mirelo-ai/sfx1.6/extend-audio

Accept:

kind inputactivity audiohash 2090e155…extracted Aug 15, 2026version currentsource upstream spec ↗

field	recorded source
schema	Source linked above. upstream-spec Source trace `0531b238de728c958ab3b1b71c1fdb8ac2cb599be11aea300e036f9b64d54495` { "fetchedAt": 1786770058, "extractorVersion": "1", "verifiedAt": null }

Request body

8 properties · 1 required · 0 $defs

property	type	description	constraints
audio_url*	string	URL of the audio prefix to extend. The prefix duration must be 3–59 seconds; the total output (prefix + append_duration) is capped at 60 seconds.
append_duration	number	How many seconds to add after the prefix. Total output = prefix duration + append_duration, capped at 60s. Minimum 1s, maximum 57s (60s cap minus the 3s prefix minimum).	1 ≤ n ≤ 57 · default: 10
seed	integer	Seed for generation. -1 or None for random.	-1 ≤ n ≤ 18446744073709552000 · nullable
upload_audio_format	enum	Audio format for the returned files.	wav \| mp3 \| aac \| flac · default: "wav"
ambience	boolean	When true, run the extend+loop path: extend the prefix and stitch the end back to the prefix start so the tile loops seamlessly. When false, run a one-shot extension.	default: false
num_samples	integer	Number of variations to generate.	1 ≤ n ≤ 4 · default: 2
text_prompt	string	Optional text prompt guiding the extension.	nullable
double_output	boolean	Only used when ambience=true: concatenate the loop with itself for a 2x-length output.	default: false

Validate a payload

before you spend tokens

shell

$ curl -X POST https://modelschemas.com/v1/validate \
    -d '{"provider":"fal","endpointId":"mirelo-ai/sfx1.6/extend-audio","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}