FFmpeg Images to Video

Endpoint

POST https://api.roasos.com/v1/assembly/images-to-video

Send your API key as a bearer token. The key needs the scope api:write. Every paid request also needs an Idempotency-Key header.

The envelope fields quote_only, quote_id, webhook_url and wait_timeout_seconds behave the same on each model endpoint. Refer to Jobs and Quotes and credits.

Good at

Build a slideshow, a product spin, or a hard-cut sequence from stills you already own. frames is a FRAME COUNT, not a duration: at the default 24 frames per second, 24 frames is one second.

Send at most 12 images, and at most 600 frames on any one of them. fps runs from 1 to 120.

The media of this operation travels inside images[].url and not in a top-level media field. Every one of those URLs must be an immutable image on https://cdn.roasos.com that your workspace owns.

The price is one credit, flat.

Pricing

The unit is one operation. Pricing key: images-to-video.

The credits come from the roasOS pricing table. No other field changes the price. To get the exact price of your request, send it with quote_only: true first.

Modes

• images-to-video

Provider endpoints: fal-ai/ffmpeg-api/images-to-video.

Request fields

The schema is strict. A field that is not in this table gets 400 unsupported_option. The field names are the roasOS role names. One role has one name in every family.

Media

The media of this endpoint travels inside the image list, at images[].url, and not in a top-level media field. Every URL there is checked as a source image.

Every other role is refused: avatar_id, elements, product_id, product_images, references, reference_images, image_url, end_image_url, scene_id, scene_image, video_urls, video_url, audio_urls, audio_url, voice_id. A refused role gets 400 unsupported_option.

Prompt

None. This operation takes no prompt.

Decide the frame rate first, then the per-image frame counts. Changing fps after you have picked frame counts changes every hold time at once.

Not exposed

These catalog entries describe omitted inputs, pinned values and source constraints. They do not imply that the provider accepts every listed field.

• images — pinned to fal accepts 200 entries; this door accepts 12, the family distinct-URL cap.

Result

The result kind is video. Always present: url.

{
  "data": {
    "id": "gen_…",
    "kind": "video",
    "model": "images-to-video",
    "status": "completed",
    "result": {
      "url": "https://cdn.roasos.com/workspaces/ws_01/result"
    }
  }
}

The files are immutable objects on https://cdn.roasos.com. A result URL is a valid media input for your next request.

Example

The three steps are always the same: quote, run, poll.

# 1. Quote. Nothing is spent.
curl -X POST https://api.roasos.com/v1/assembly/images-to-video \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-images-to-video-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_only":true,"images":[{"url":"https://cdn.roasos.com/workspaces/ws_01/uploads/images-1.png","frames":1}]}'
# 200 { "data": { "kind": "quote", "quote_id": "q_7Hk...", "credits": 1, "expires_at": "...",
#        "confirmation": { "model": "images-to-video", "example": "per_operation" } } }

# 2. Run. Same body, same Idempotency-Key, quote_id in place of quote_only.
curl -X POST https://api.roasos.com/v1/assembly/images-to-video \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-images-to-video-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_id":"q_7Hk...","images":[{"url":"https://cdn.roasos.com/workspaces/ws_01/uploads/images-1.png","frames":1}]}'
# 201 { "data": { "id": "gen_...", "status": "queued", "credits_reserved": 1 } }

# 3. Poll, then read the result.
curl https://api.roasos.com/v1/jobs/gen_.../status -H "Authorization: Bearer roasos_sk_live_..."
curl https://api.roasos.com/v1/jobs/gen_.../result -H "Authorization: Bearer roasos_sk_live_..."

Today

The endpoint is POST /v1/assembly/images-to-video.

It is live.

See also

• llms.txt for this model — the same facts as one plain-text file for an agent.
• GET https://api.roasos.com/v1/catalog/images-to-video — the machine-readable form: enums, defaults, limits and prices. Refer to the API reference.
• Jobs — how to poll a job and read its result.
• Provider endpoints: fal-ai/ffmpeg-api/images-to-video.