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fal-ai/kling-video/v4/video-to-video/edit

fal-ai/kling-video/v4/video-to-video/edit is a video to video tool from fal that runs in the background and returns video. Pay as you go from $0.1222 per second, with one API key.

Try itfrom $0.1222 / second

Pricing

resolution: 720p up to $7.332, 1080p up to $10.998 per run for a 30-second source, the maximum. Billed on input plus output seconds, at least twice the output. The final charge comes from usage.

Limits

Runs: In the background
Returns: video
Longest queue wait: 3600s
Run deadline: 1800s
Largest inline input: 1024 KB
Largest input file: 500 MB
Largest output: 4768 MB
Outputs per run: 16

Input

Field	Kind	Default	Description
`prompt` required	text	—	Edit instruction. Reference the source video as @Video1.
`video_url` required	URL or file	—	The video to edit (3-30s), referenced as @Video1. Max file size: 300.0MB, Min width: 700px, Min height: 700px, Max width: 4553px, Max height: 4553px, Min aspect ratio: 0.40, Max aspect ratio: 2.50, Min duration: 3.0s, Max duration: 30.05s, Min FPS: 23.9, Max FPS: 60.05, Timeout: 30.0s
`image_urls`	URLs or files	—	Reference images, referenced as @Image1, @Image2, ...
`video_urls`	URLs or files	—	Reference videos, referenced as @Video2, @Video3, ... (max 4). The source, reference and element videos must total at most 30s.
`elements`	JSON	—	Characters/objects, referenced as @Element1, @Element2, ... (max 7). Up to 3 elements may carry a voice_id and up to 3 may be video elements.
`voice_ids`	list	—	Voices referenced in the prompt as @Voice1, @Voice2, ... (max 3, including voices bound to elements). Create one with https://fal.ai/models/fal-ai/kling-video/create-voice
`duration`	number (whole) 3 to 30	—	Output duration in seconds (3-30). Defaults to the source video's length.
`resolution`	one of 720p, 1080p	1080p	Output resolution.

Same request in code

curl https://api.spiral.ai/v1/runs \
  -H "Authorization: Bearer $SPIRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "provider": "fal",
    "model": "fal-ai/kling-video/v4/video-to-video/edit",
    "input": {
      "prompt": "Change the background to a tropical island at sunset.",
      "video_url": "<video_url>"
    }
  }'