LTX Video 2.3 Extend - Ekly API

Extend an existing clip with newly generated, continuous footage and native audio using LTX-2.3. Upload a video, describe what happens next.


Model id	`ltx-2.3-extend-fal`
Media	video
Submit to	`POST /v1/videos`
Price	7.8 credits per_second before discounts
Typical time	about 60.0 s

Request

Required: prompt, source_video
Optional: duration_seconds

{
  "model": "ltx-2.3-extend-fal",
  "prompt": "The dancer turns and walks out of frame toward the exit, camera holding steady.",
  "duration_seconds": 5,
  "source_video": "asset_…"
}

Field	Allowed	Default
`duration_seconds`	`5`, `6`, `8`, `10`, `15`, `20`	`5`
`source_video`	asset id (up to 1)

Reference inputs take asset ids from POST /v1/uploads or an earlier output’s asset_id. Prices and allowed values come from the live catalog; GET /v1/models/ltx-2.3-extend-fal is always current.