Narrow Edit Preserved Encoding Clip

Create a 12-second training animation from [before and after byte-range summary]. Highlight only the authorized edit span, preserve the surrounding file frame and hold the unchanged format badge. If preservation is unverified, use a pending-check badge. Do not display secrets or fabricate a terminal success message.

Confirm required reference images and timing inputs are present before generating. Keep objects, identities, spatial relationships and light direction consistent. Render the clip when video generation is supported; otherwise supply a timed shot list, reference checklist and generation-ready prompt, labeled as a production plan. Do not claim rendered output without an actual file. Check the opening, transition and final frame against the stated counts and geometry.