Kling 4.0 Video Edit API

Edit and restyle any video from a text prompt.

PlaygroundAPI
Pricing
~90.64s
POST /v2/kling-4-video-edit · submit + poll
 1# pip install "segmind>=1.1.0"
 2# export SEGMIND_API_KEY="YOUR_API_KEY"
 3from segmind import SegmindClient, InferenceFailed, InferenceTimeout
 4
 5# Async (v2) — recommended for long-running / video models.
 6# run() blocks up to 600s; submit_async + job.wait(timeout=...) sets a longer
 7# deadline and keeps the request_id so you can re-poll later.
 8client = SegmindClient()                      # reads SEGMIND_API_KEY
 9payload = {
10    "video": "https://segmind-resources.s3.amazonaws.com/input/kling-4-video-edit-source-e880568e.mp4",
11    "prompt": "Transform the scene into a violent daytime thunderstorm: towering slate-grey storm clouds roll over the plaza, heavy rain falls in sheets, a sharp lightning flash lights the glass towers, and the pale paving turns to a wet mirror with splashing puddles. Keep the breakdancer's windmill spin, his limbs and the locked camera framing exactly as in the source.",
12    "duration": 5,
13    "resolution": "720p",
14    "aspect_ratio": "adaptive",
15}
16job = client.submit_async("kling-4-video-edit", **payload)
17print(job.request_id)                         # available immediately
18try:
19    result = job.wait(timeout=900, interval=2.0)
20    print(result["status"])                  # COMPLETED
21    print(result.get("output"))              # model output (e.g. video URL)
22except InferenceTimeout as e:
23    print("still running:", e.request_id)    # re-poll later with this id
24except InferenceFailed as e:
25    print("failed:", e.detail)
26
27# Fast models (<=600s) can use the one-liner instead:
28# result = segmind.run("kling-4-video-edit", **payload)

API Endpoint

POSThttps://api.segmind.com/v1/kling-4-video-edit

Parameters

promptrequired
string

Describe the edit, e.g. restyle, replace an object or change the weather. Name reference images @Image1, @Image2, ...

videorequired
string (uri)

The MP4/MOV clip to edit (3-30 s, 24-60 fps, 700-4553 px per side, up to 300 MB).

aspect_ratiooptional
string

Adaptive follows the input media; or pick a fixed frame.

Default: "adaptive"
Allowed values :
Adaptive→"adaptive"
"16:9""9:16""1:1""21:9"
durationoptional
integer

Output length in seconds (3-30). Billed per second of output video.

Default: 5Range: 3 - 30
reference_imagesoptional
string[]

Optional. Up to 10 images to bring into the edit. Name them @Image1, @Image2, ... in the prompt.

resolutionoptional
string

Output resolution. 1080p costs 1.5x the 720p rate per second.

Default: "1080p"
Allowed values :
"720p""1080p"

Response Type

Returns: Video

Asynchronous requests (v2)

Use Async for video, long-running (>~60s), or high-concurrency workloads; Sync is simplest for fast image & LLM calls. Async submits a request and you poll it to completion.

  1. 1
    POST /v2/kling-4-video-edit

    Submit — returns request_id, status_url, response_url

  2. 2
    GET /v2/requests/{id}/status

    Poll — until COMPLETED or FAILED

  3. 3
    GET /v2/requests/{id}

    Result — final response body

Status states

QUEUED— Accepted, waiting for a worker
PROCESSING— Running on a worker
COMPLETED— Done — result body is ready
FAILED— Errored (incl. content/RAI blocks)
  • A FAILED request is served as HTTP 422 — the body still carries the error detail.
  • An unknown or expired request_id returns HTTP 404.
  • Results are retained for 1 hour, then expire.
  • Content / RAI blocks surface as FAILED, not a separate state.
  • Track completion by polling the status endpoint.

Common Error Codes

The API returns standard HTTP status codes. Detailed error messages are provided in the response body.

400

Bad Request

Invalid parameters or request format

401

Unauthorized

Missing or invalid API key

403

Forbidden

Insufficient permissions

404

Not Found

Model or endpoint not found

406

Insufficient Credits

Not enough credits to process request

429

Rate Limited

Too many requests

500

Server Error

Internal server error

502

Bad Gateway

Service temporarily unavailable

504

Timeout

Request timed out