Write the AI Video Generator Start And End Frame endpoint contract

Use the query as a capability requirement, not proof that every generator exposes the same control. Capture the exact model name, surface, account context, and input rules beside the frame pair. Inventory source rights for both images and mark any identity, product, text, or location detail that cannot change. Endpoint control is meaningful only when the transition has a defined editorial job and the two supplied states are compatible enough to review. At this stage, preserve the evidence table, and ask the creative lead to record control availability before the scope confirmation.

Inspect the path, not only the two supplied images

Give each candidate the same opening and closing frames plus one sentence describing the causal transition; record whether both inputs are accepted and how revisions are expressed. Review intermediate frames at a consistent cadence for geometry, identity, contact, lighting, camera axis, and causal order. A model can reproduce the beginning and ending while inventing an unusable bridge, so acceptance belongs to the whole shot rather than two thumbnails. At this stage, preserve the review copy, and ask the creative lead to record reversal cost before the fallback decision.

• Opening-state fidelity For the working record, preserve the delivery checklist, and ask the brand reviewer to record source fidelity before the fallback decision.
• Causal intermediate motion For the working record, preserve the reference set, and ask the factual editor to record identity consent before the fallback decision.
• Closing-state and edit usability For the working record, preserve the claim inventory, and ask the channel editor to record format readiness before the acceptance review.

Separate capability, availability, and entitlement

Fail closed when a vendor page mentions image-to-video but does not explicitly document an end-frame input, or when the tested surface differs from the cited version. Verify the exact vendor, model version, region, account surface, input constraints, and check date before relying on the feature. The documented Veo example proves a named control in that context; it does not prove current SEELE access or any free, downloadable, permanent, or open-ended use. For the working record, preserve the rights memo, and ask the factual editor to record temporal order before the acceptance review.

Keep the AI Video Generator Start And End Frame evidence ledger narrow

Google DeepMind first-party documentation verifies a current first-and-last-frame control for Veo 3.1. Record the source owner, product or model name, verification date, surface or region, exact claim, and unresolved gap beside the test. Taxonomy eligibility and search demand explain why the page exists, but neither can be reused as proof that SEELE or another provider exposes the entire query as a current capability. Before moving on, preserve the rights memo, and ask the continuity editor to record visible continuity before the delivery pass.

• Google DeepMind lists first and last frame among the documented creative controls for Veo 3.1. Before moving on, preserve the reference set, and ask the continuity editor to record human approval before the delivery pass.