Car walkaround clip: a 30-second Seedance 2.5 take for dealer ads

A walkaround is one camera path around one vehicle, which is what a 30-second one-take generation is for. On Sume, Seedance 2.5 renders it at $17.34 for 720p or $42.65 for 1080p, 16:9, read 2026-10-05.

The catch for dealers is accuracy. A generated car is not your car. Use a real photo as a first frame and treat the output as a promo, not a listing record.

The walkaround prompt

Give the path in order, the speed, and what the camera ignores.

• Subject: "A dark blue compact SUV parked on a clean concrete forecourt at golden hour."
• Path: "The camera starts at the front left corner at hood height and moves slowly clockwise around the car at a steady walking pace, passing the driver door, the rear, and the passenger side."
• Height: "Camera stays at roughly door-handle height, slightly lower at the wheels."
• Light: "Low warm sun from the left, soft reflections on the paint, no other cars in frame."
• End: "The camera ends at the front right corner and holds for two seconds."

Price by length and resolution

A full circle at a walking pace takes the full 30 seconds; a half circle fits in 15.

What a vehicle clip must get right

Cars have fixed, countable features: wheel count, mirror count, door count, badge position, plate. Watch for these across the circle, because a long one-take is where a feature can appear or vanish. ByteDance Seed positions Seedance 2.5 around one-take creation and scene continuity (read 2026-10-05), but the post gives no accuracy figure, so check each take yourself.

Never show a generated plate, price, mileage or trim as if it were the real listing. If the clip is an ad, add real text in an editor after generation, and say in your disclosure what is generated if your market requires it.

Request

A 720p walkaround with a real first frame. Replace the image URL with your own front-three-quarter photo.

curl -X POST https://api.sume.com/v1/videos \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: suv-walkaround-001" \
  -d '{"model":"seedance-2.5","prompt":"The camera moves slowly clockwise around the car at a steady walking pace, door-handle height, low warm sun from the left, no other cars. End at the front right corner and hold.","frame_images":[{"type":"image_url","image_url":{"url":"https://example.com/suv-front-left.jpg"},"frame_type":"first_frame"}],"duration":30,"resolution":"720p","aspect_ratio":"16:9"}'

Draft, then decide

Run a half-circle at 480p first: 15 seconds is $4.04. If the car holds its shape past the rear corner, the full 30-second 720p pass at $17.34 is a safer bet. A 1080p pass adds $25.31 over 720p, which matters if you plan to show the clip on a lot display.

With no seed on Sume's video models, a re-render is a new take. If the first take's path was good but the paint looked off, change only the light line and keep the path sentence word for word.

Split a long walkaround in two

Check the same four things on every take: the wheel count, the mirrors, the badge and the plate area. Write the result down per take. Dealers who run many vehicles through the same prompt get the most from a short checklist, because the prompt repeats and the failure modes repeat with it. A take that fails the checklist is a re-render at 480p, not a 720p one.

If one 30-second take wanders, split the circle into two 15-second halves. Front-left to rear is job one; rear to front-right is job two, started from a first-frame photo of the rear three-quarter view. Two 15-second jobs at 720p cost $17.34 together against $17.34 for one 30-second job, so the split costs about the same. The price of the split is a seam, and the seam is easy to hide at the rear bumper.

Interior shots are a separate clip. Do not ask for both exterior and interior in one take; the one-take idea works when the camera stays in one space.