GET

/v1/schemas/fal/video/fal-ai/ltx-2.3/audio-to-video

Accept:

kind inputactivity videohash d02d309d…extracted Oct 9, 2026version currentsource upstream spec ↗

field	recorded source
schema	Source linked above. upstream-spec Source trace `7cf4375aec845ad722e6c62b74b9a781bfc75b4792d51942803adda339333604` { "fetchedAt": 1791522002, "extractorVersion": "1", "verifiedAt": null }

Request body

6 properties · 1 required · 0 $defs

property	type	description	constraints
audio_url*	string	URL of the audio file to generate a video from. Duration must be between 2 and 20 seconds; pro models support a maximum of 10 seconds. Must be publicly accessible or base64 data URI.
aspect_ratio	enum	The aspect ratio of the generated video. If 'auto', the aspect ratio will be determined automatically based on the input image, or defaults to 16:9 if no image is provided.	auto \| 16:9 \| 9:16 · default: "auto"
prompt	string	Text description of how the video should be generated. Required if image_url is not provided. When image_url is provided, this describes how the image should be animated.	length ≥ 1 · length ≤ 5000 · nullable
image_url	string	URL of an image to use as the first frame of the video. If not provided, prompt is required.	nullable
guidance_scale	number	Guidance scale for video generation. Higher values make the output more closely follow the prompt. Defaults to 5 for text-to-video, or 9 when providing an image.	1 ≤ n ≤ 50 · nullable
enable_safety_checker	boolean	Authorized callers may set false to request relaxed screening.	default: true

Validate a payload

before you spend tokens

shell

$ curl -X POST https://modelschemas.com/v1/validate \
    -d '{"provider":"fal","endpointId":"fal-ai/ltx-2.3/audio-to-video","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}