Rising-stem gates are a handwheel pair, not a foundry film

Stem down, then stem up, same yoke. First-last. A cinematic pour at a foundry is not the catalog row.

A rising-stem gate is a travel you can photograph twice: handwheel and stem down on the closed seat, handwheel and stem up on the open seat, same yoke, same packing, same face-to-face. That pair is the listing. Sparks in a pour bay are a manufacturer film about a plant you may not even own. Do not spend the interpolation meter on a foundry you never shot.

Create a first-and-last-frame transition video is the named job: two photos in, one clip that opens on the first and finishes on the second. Flux 3 First Last Frame to Video is the catalog row for that interpolation.

Closed stem, then open stem, same yoke

Photograph the valve square-on, or at the three-quarter you already print on the cut sheet. Stem fully down. That is frame A. Do not touch the tripod. Run the handwheel to the open position you sell. Stem up, threads showing, yoke still the yoke. That is frame B.

First-last frame converts an open-ended prompt into a bounded problem. Ordinary image-to-video knows where it begins and improvises the rest. Give it a destination and it has to land there. Stem-up is a destination. If you never attach that plate, there is nothing to land on, and the model will guess how far the stem travels. That guess is a different face-to-face.

The two frames have to be connectable. Same serial, same yoke casting, same lens height, same lighting family. A closed 6-inch iron into an open 8-inch stainless is a morph of the SKU. A warehouse aisle into a foundry floor is a warp. Lock the mark on the floor. Then interpolate.

Prompt the path, not the iron. "Stem rises on the same yoke, handwheel turns, camera locked, no new flange." Re-describing "OS&Y gate, class 150, rising stem" restages the hardware. The stills already contain the class. Language does not pin pixels.

Flux.3 meters the middle

Black Forest Labs, category image-to-video, two stills, native audio, 720p or 1080p, durations from 5 seconds through 20, 9 credits per second. Description: FLUX.3 interpolates a smooth, coherent transition between a defined start frame and end frame, with native audio. This is not a one-still "make it move" row. If either end is the wrong identity, every second is a morph between two mistakes, with a soundtrack attached.

Size the interpolation to the travel. A small bronze does not need 20 seconds of stem. A long OS&Y might. Inspect the midpoint. Ends are held by construction. The middle is where a generator cheats — extra packing, a handwheel that swaps spokes, a stem that grows. If the middle is wrong, reroll the motion, not the stills, unless a still was the lie.

Native audio is on. Plan for a bed the model will generate with the transition. If you need a specific VO ("non-rising is a different SKU"), that is a later pass. Native audio here is not lipsync against your track. Write silence into the prompt if you will score later. Qualities go to 1080p. Do not brief 4K.

The agent job is the named two-still pass. Cost is shown before you confirm; it is for this interpolation, not a budget to invent the open stem in the same call.

A foundry pour is a different film

AI video for manufacturers is the nearby plant page: the factory floor as an asset, a line at full rate, sparks, recruitment. That playbook is scale. It is not a cut-sheet travel of one yoke. Running a cinematic pour as the catalog row is how a specifier gets a pretty melt and never sees the stem.

AI video for plumbers is the other nearby audience: the satisfying fix, a clear pipe, a diagnostic walkthrough. That playbook is a shop that bills labor. It is not an OEM gate. Do not generate a plumber who talks like a brochure while a cousin valve turns behind them. The catalog is the product. A talking twin is a different audience.

Do not text-to-video "molten iron, gate valve emerging from sand." You will get a plant, not this face-to-face. If the week is a capability film, that is the manufacturers page and real floor footage. If the week is the SKU, it is stem down, stem up, same yoke. Overlay the figure number after picture lock. Do not ask the interpolation to typeset it on the body.

One photo is a different job

One hero of the closed valve plus "make the stem rise" is ordinary image-to-video, and it will invent the open state. Useful for a light sweep. Useless as a demo of travel you never photographed.

A loop (same still in both slots) is ambient motion on one plate. This offer needs two states. If you only shot closed, reshoot the open. The motion is the cheap middle. The stills are the contract.

FAQ

Can I run first-last with one photo and a description of the open stem?

No. This capability needs two reference photos. Describe-the-end is single-still image-to-video. It will not land on a plate you never attached.

Is a foundry pour a valid catalog clip for a gate OEM?

Not as the row that sells the stem. A pour is a plant film. Manufacturers can own that footage. The listing is stem down, then stem up, same yoke. Interpolate the pair.

What durations does Flux 3 First Last Frame list?

5s through 20s, inclusive, one-second steps. 9 credits meters per second. Native audio is on. 1080p is the quality ceiling on the row.

Should a generated plumber turn the handwheel?

No. Plumbers is a trade-shop fix shot. OEM is the valve. A constructed installer is a presenter you do not need. Photograph the travel. Keep the face off the cut sheet.