Chimney sweeps interpolate creosote to a clean flue
Two stills of the same stack: Flux 3 first-last interpolates 5–20s at 9 credits per second with native audio; a 30s identity hold invents new brick.
Two stills of the same stack: Flux 3 first-last interpolates 5–20s at 9 credits per second with native audio; a 30s identity hold invents new brick.
A sweep ad that books is disappearance of creosote on this flue, not a cinematic roof and not a talking tech walking winter advice. You already own both plates: dirty, then clean, same mortar, same pot. Interpolation is the job. A long single-shot “hold the chimney” is how a model grows a second stack.
Frame A is creosote; frame B is the same flue clean
Photograph the stack where it sits — same ladder height, same roof pitch, same neighbouring gable. That is the first frame: creosote on the crown, soot on the brick you will actually sweep. Photograph the same geometry after the job, or composite the clean crown from a second still of that geometry. That is the last frame.
First-last frame takes those two stills and generates the motion between them. Ordinary image-to-video knows where it begins and improvises the rest. First-last has to land.
The two frames have to be connectable in the time available. Same stack, same lighting family, same lens. A close-up of tar morphing into a wide of a different house is a warp, not a sweep. Prompt the travel, not the architecture: hold, then the glaze recedes; camera locked; no new pot. If the endpoints share geometry, the morph reads as a job. If they do not, you get a mushy crossfade you could have made in an editor without a video bill.
Flux 3 interpolates; it does not rebuild the house
Create a first-and-last-frame transition video is the named agent job: two photos in, one transition out. The agent passes them as first and last frame and picks a first-last-capable model. Cost is priced per model, shown before you confirm. This is not the plain “turn one photo into a video” capability. Missing the clean flue is a different job.
Flux 3 First Last Frame to Video is the catalog row: start frame and end frame, native audio, up to 1080p, durations from 5 seconds through 20. The listed rate is 9 credits per second. Audio is on — write a brush, a quiet roof, or silence. A silent brief still gets a soundtrack you did not choose. Quoted “book now” does not become a title. Overlay that after lock.
Five seconds is the floor. Twenty is the ceiling. A crown wipe does not get better at 20s; you pay 9 a second for the pad. Iterate at 5s once the stills share geometry. Do not use a last frame that is a different property. Do not treat a loop (same dirty still in both slots) as a before/after. This offer needs two states.
A 30-second hold invents brick
Seedance 2.5 is the native 30-second single-shot family: 4s–30s, 720p, 47 credits, native audio. I2V is the still-to-motion job on that family; the published URL is the family page. A 30-second identity hold from one dirty-flue still has to invent extra seconds of chimney. That is how new brick appears.
First-last on Flux 3 is 5–20s at 9 per second because both ends are pinned. A 30s hold is not “more professional.” It is more time for the model to leave your stack. Text-to-video has no flue. “Chimney sweep before and after on a Victorian stack” is a house the model liked. The homeowner knows their mortar.
If you needed a line — same-week appointments, a postcode — that is overlay on the keeper, not a talking tech on the ridge. You do not need a mouth on a flue interpolation.
HVAC and contractor pages are not this sweep
/for/hvac-companies is seasonal indoor plant: pre-summer AC, pre-winter furnace. That is not a clay pot on a roof. Creosote-to-clean is two stills of the same stack.
/for/contractors is process behind walls — demo, framing, a walkthrough. A chimney sweep is not a renovation arc. Nearby home-services pages stay nearby. This page owns interpolation on a photographed flue. Crop the crew’s van out of frame A, or shoot again. Do not prompt the van out and hope Flux rebuilds the eaves.
FAQ
Can I animate one dirty-flue photo and hope it cleans?
You can. The ending is then the model’s guess. A sweep ad is the clean crown on the same brick. Pin that crown as the last frame or you are not selling the job.
Why not Seedance 2.5 for a 30-second “whole job” film?
Seedance 2.5 is 4–30s, 720p, 47 credits, native audio, a single-shot hold. Extra seconds without a last frame are how new brick appears. Flux 3 first-last is 5–20s at 9 credits per second because both ends are yours.
Do the two photos have to be shot on the same day?
They have to share geometry. Same stack, same lens family, same lighting neighbourhood. Noon into dusk is a time-lapse you should prompt as one. A different house is a morph.
Is this the HVAC or contractor audience page?
No. HVAC is seasonal indoor plant. Contractors are behind-the-wall process. This job is two stills of one flue, interpolated. Do not copy those /for pages onto the roof.