Video Background Change API

Put the subject of a video in another setting described in words: the person, the outfit and the movement stay, the background and its light change.

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POST/v1/generateworkflow: change_video_background-v1

One endpoint serves every workflow — this page documents change_video_background-v1, the current version. Credits are debited at submission (2.8 cr/s standard, 3.7 cr/s pro); a failed generation is refunded automatically. Earlier versions of this endpoint, if any, keep being served under their own names. This workflow needs an active plan.

Parameter	Value for this workflow
workflow	"change_video_background-v1" required
source_video	Your video — one public HTTPS URL.required
fields.scene	New background. Where the model should be — e.g. "a quiet Paris street at golden hour".required
duration	per engine (seconds)
tier	"standard" (2.8 cr/s) or "pro" (3.7 cr/s)
webhook_url	Optional — we POST the outcome here when the generation settles. Without it, poll the URL returned in the response until the status settles.

Example request

curl -X POST https://thenewblack.ai/api/v1/generate \
  -H "Authorization: Bearer tnb_live_XXXXXXXXXXXX" \
  -H "Content-Type: application/json" \
  -d '{
    "workflow": "change_video_background-v1",
    "source_video": "https://example.com/clip.mp4",
    "fields": {
      "scene": "a quiet Paris street at golden hour"
    },
    "tier": "standard"
  }'

// 202 Accepted
{
  "generation_id": "3f1c9a6e-...",
  "status": "running",
  "poll": "/api/v1/generations/3f1c9a6e-..."
}

Example response

Poll /v1/generations/{id} (or receive the webhook) until the generation settles:

// 200 OK
{
  "generation_id": "3f1c9a6e-...",
  "workflow": "change_video_background",
  "status": "succeeded",
  "result": {
    "type": "video",
    "url": "https://.../result.mp4",
    "thumbnail": "https://.../thumb.webp"
  }
}

Results are stored for 48 hours — copy them to your own storage. Authentication, errors and webhooks are documented in the full API reference.

Frequently asked questions

What does the endpoint keep?

The person, the face, the hair, the outfit, the movement and the camera. Only the setting and the lighting on the person change.

How is it billed?

By the second of the video you send, standard or pro. The length is read from the file before the job starts.

How much does it cost?

2.8 credits per second on the standard tier, 3.7 per second on pro. Credits come with plans and packs; a failed generation is always refunded.

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