GET
/v1/schemas/fal/video/kling/v4/flash/reference-to-video
Accept:
| field | recorded source |
|---|---|
| schema | Source linked above. upstream-spec Source trace9e2bf2498ffa866fea460d7d40952e2707cb9c44a69d2b6d2a3d899eb6b2857a{
"fetchedAt": 1793854802,
"extractorVersion": "1",
"verifiedAt": null
} |
Request body
8 properties · 1 required · 1 $defs| property | type | description | constraints |
|---|---|---|---|
| prompt* | string | Text prompt. Reference inputs as @Image1, @Video1, @Element1, etc. | length ≤ 26000 |
| image_urls | string[] | Reference images, referenced as @Image1, @Image2, ... (max 10). | items ≤ 10 · nullable |
| resolution | enum | Output resolution. Flash is 720p only. | 720p · default: "720p" |
| video_urls | string[] | Reference videos (3-20s each, 20s combined with element videos), referenced as @Video1, @Video2, ... (max 5). | items ≤ 5 · nullable |
| aspect_ratio | enum | Aspect ratio of the generated video. 'auto' adapts it to the references. | auto | 16:9 | 9:16 | 1:1 | 21:9 · default: "16:9" |
| elements | KlingV4FlashElement[] | Characters/objects, referenced as @Element1, @Element2, ... (max 7). Up to 3 may be video elements. Flash does not accept voices. | items ≤ 7 · nullable |
| duration | integer | Video duration in seconds (3-20). | 3 ≤ n ≤ 20 · default: 5 |
| start_image_url | string | Optional image to use as the first frame. Counts toward the image reference limit. | nullable |
Types
1 $defsKlingV4FlashElementobject
A Kling 4.0 element without a bound voice; Flash takes no voices.
| frontal_image_url | string | The frontal image of the element (main view). | nullable |
| reference_image_urls | string[] | Additional views of the element from different angles (1-3). | items ≤ 3 · nullable |
| video_url | string | A video of the element, used instead of images (3-8s). | nullable |
Validate a payload
before you spend tokensshell
$ curl -X POST https://modelschemas.com/v1/validate \
-d '{"provider":"fal","endpointId":"kling/v4/flash/reference-to-video","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}