GET

/v1/schemas/fal/video/kling/v4/flash/image-to-video

kind inputactivity videohash 2adf0c45…extracted Nov 5, 2026version currentsource upstream spec ↗
fieldrecorded source
schemaSource linked above.

upstream-spec

Source trace
74abe51448de35396b6a1f3ef8b2e50918947eb1bc03e3e7afacf4df27fc808a
{
  "fetchedAt": 1793854802,
  "extractorVersion": "1",
  "verifiedAt": null
}

Request body

4 properties · 1 required · 0 $defs
propertytypedescriptionconstraints
start_image_url*stringImage to use as the first frame of the video. Flash does not take an end frame.
promptstringOptional text prompt describing the shot.length ≤ 26000 · nullable
durationintegerVideo duration in seconds (3-20).3 ≤ n ≤ 20 · default: 5
resolutionenumOutput resolution. Flash is 720p only.720p · default: "720p"

Validate a payload

before you spend tokens
shell
$ curl -X POST https://modelschemas.com/v1/validate \
    -d '{"provider":"fal","endpointId":"kling/v4/flash/image-to-video","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}