Facebook Feed video ad 4:5 at 1440x1800: render it with Timeline

Meta's Facebook Feed video ad page lists a 4:5 aspect ratio at 1440 x 1800 pixels. No Sume video model lists 4:5, so generate at 9:16 or another listed ratio and render the final file with Timeline 1.0, whose output accepts a width of 1440 and a height of 1800.

What does Meta's Facebook Feed page list?

The page read on 2026-09-30 gives these values for Awareness video ads in Facebook Feed.

Which Sume video model gives 4:5?

None does. The video generation docs list aspect ratios such as 16:9, 9:16, 1:1, 3:4 and 4:3, and each model advertises its own subset in supported_aspect_ratios. Read that field from GET /v1/videos/models before you pin a ratio.

So the 4:5 file is a Timeline output, not a generation setting.

How do I render 1440x1800?

Timeline 1.0 only takes URLs that are already this workspace's media.sume.com artifacts or assets, so a completed Sume generation can go straight in, and a file from anywhere else must be imported first (POST /v1/media-imports; the Timeline docs do not show its request body). output.width and output.height must be even integers from 256 to 2160, and fit chooses cover (crop to fill), contain, stretch or blur. audio.mode of silence declares a length with no audio file; use audio.url for a music or voice file instead.

curl -X POST https://api.sume.com/v1/timeline-1.0/render \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: feed-45-001" \
  -d '{
    "audio": { "mode": "silence", "duration_seconds": 15 },
    "video": [{
      "source_url": "https://media.sume.com/artifacts/artf_demo/product.mp4",
      "start": 0,
      "duration": 15,
      "fit": "cover"
    }],
    "output": { "width": 1440, "height": 1800 }
  }'

What should I check before I upload?

Run POST /v1/timeline-1.0/plan first; it is unbilled and returns duration_seconds and billable_minutes. Render is priced at $0.10 per output minute, rounded up (confirm live in GET /v1/catalog).

A silent render carries no audio, and Meta marks video sound as optional but recommended, so add a spine if the placement needs sound. Meta also lists H.264 and stereo AAC settings; the Timeline docs do not state the codec of the output, so verify the finished file against Meta's page. Pages change, so re-read before delivery.