GET

/v1/schemas/fal/video/blackforestlabs/flux-3/first-last-frame-to-video/draft

Accept:

kind inputactivity videohash cc346c4a…extracted Aug 6, 2026version currentsource upstream spec ↗

field	recorded source
schema	Source linked above. Source trace `ff2e2080b33e28fd8f5bc0e8491241d349538350d074d18d675b27e57bf3dea3` { "fetchedAt": 1785992534, "extractorVersion": "1", "verifiedAt": null }

Request body

7 properties · 3 required · 0 $defs

property	type	description	constraints
end_image_url*	string	URL or data URI of the image used as the last frame of the draft.
prompt*	string	The text prompt describing the draft video.
start_image_url*	string	URL or data URI of the image used as the first frame of the draft.
safety_tolerance	integer	The safety tolerance level for the generated video. 0 is the strictest and 4 is the most permissive.	0 ≤ n ≤ 4 · default: 2
aspect_ratio	enum	Aspect ratio of the generated draft. `auto` lets the model choose.	auto \| 21:9 \| 2:1 \| 16:9 \| 4:3 \| 1:1 · +2 more · default: "auto"
generate_audio	boolean	Whether to generate audio for the draft video.	default: true
duration	enum	Draft duration in whole seconds from 5 through 20. An explicit duration pins the two images to the video boundaries.	5 \| 6 \| 7 \| 8 \| 9 \| 10 · +10 more · default: 5

Validate a payload

before you spend tokens

shell

$ curl -X POST https://modelschemas.com/v1/validate \
    -d '{"provider":"fal","endpointId":"blackforestlabs/flux-3/first-last-frame-to-video/draft","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}