Ball valves quarter-turn from closed to open on the same body

Handle across, then handle in-line, same body and end connections. First-last is the product-turn. A generated ball that changes port size is a different valve.

A ball-valve listing is a quarter-turn you can inspect: closed is the handle across the pipe axis; open is the handle in-line. Both photographs are the same casting, the same end connections, the same port. Interpolation between those two stills is the ad.

Frame A is closed; frame B is open

Photograph the valve where it will be judged — same lens height, same light, same thread or flange pattern in the background. Handle perpendicular to the body. That is the first frame. Rotate the handle ninety degrees on the same unit. Do not swap in a sister SKU with a different port. 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 arc of the shot is decided by you.

The two frames have to be connectable. Same body, same lighting family, same camera. A macro of the ball morphing into a wide of a different valve is a warp. If the landing still shows a larger port, you photographed a different valve.

Prompt the travel, not the objects. Name the mechanism: camera locked; handle rotates ninety degrees; no new flanges. If the endpoints share geometry, the morph reads as a product-turn. If they do not, you get a mushy crossfade.

Two first-last rows, one product-turn

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.

VEO First Last Frame interpolates between first and last frames: requires an image, native audio, 4s / 6s / 8s, up to 4K, listed 40 credits with audio on (the matrix also lists an audio-off rate). Aspects 16:9 and 9:16. A quarter-turn does not need a cinematic mouth. Write the mix (a handle click, a quiet bench) or write silence. A silent brief on a native-audio row still gets a soundtrack you did not choose.

Flux 3 First Last Frame to Video is the longer interpolation: start frame and end frame, native audio, 5s–20s, 720p or 1080p, listed 9 credits per second. Use it when the handle travel needs more than eight seconds to read, or when 1080p is enough and 4K is not the point. Prompt the travel. Do not re-describe "forged brass full-port ball valve." That paragraph restages the hardware.

Pick the row by landing and length. Eight seconds of 4K on Veo if the specifier will pause on the flange. Ten to twenty seconds on Flux 3 if the turn has to be slow enough to see the stop. Do not pick both and stitch them. Stitching is how the port breathes.

Open image-to-video is not the quarter-turn

Image-to-video from one still is allowed motion with an open ending. The model will guess the last pose. A ball valve needs the open handle as last frame. A single-image wiggle that leaves the handle across is not a quarter-turn.

Do not use a last frame that is a different body. The model will connect them: a smaller port that fattens, a NPT end that becomes a flange. That is a new valve. Do not treat a loop (same still in both slots) as a product-turn. This offer needs two states: closed, then open.

Nearby, AI video for plumbers is the satisfying fix shot — clear pipe, diagnostic walkthrough. That playbook is for shops that bill labor. Do not generate a plumber who turns your valve. OEM catalog video does not need a forearm in frame.

Port size is not a prompt

Full port versus reduced port is a claim. The stills already contain it. A generate that "opens" by growing the bore is a different SKU. Keep the body large in frame. Overlay "full port" after picture lock if the mute feed needs it — type you typed, not Flux glyphs.

Order: two approved stills of the same body; first-last on Veo or Flux 3; prompt only the handle travel. Reverse that order and you will pay for a cousin valve that changed port size on the way open.

FAQ

Can I animate one photo of the closed valve and hope it opens?

You can. The ending is then the model's guess. A ball-valve ad is the open handle on the same body. Pin that still as the last frame or you are not selling the quarter-turn.

Why Flux 3 instead of Veo first-last?

Length and ceiling. Flux 3 is 5s–20s, 720p/1080p, 9 credits per second, native audio. Veo first-last is 4s / 6s / 8s, up to 4K, listed 40 credits with audio on. Same job shape: two stills, one landing. Pick by how long the handle needs to read.

Do the two photos have to be shot on the same bench?

They have to share geometry. Same body, same lens family, same lighting neighbourhood. A noon still into a night still is a time-lapse you should prompt as one. A different valve is a morph.

Is this the same as uploading one image to image-to-video?

No. One image is open-ended motion. Two images is a bounded landing. The agent notes that first-last needs first frame and last frame. Missing the open handle is a different job.