Show air entering the same neck that pours the liquid out

Original, untested video brief. No input image or generated result is supplied.

1. Task and boundary

Follow a partially filled bottle pouring through one narrow neck while air enters through that same opening. The distinct event is counterflow: a visible air pocket enters during a weaker-flow interval and rises inside the bottle, followed by renewed outward liquid flow. A steady stream with a glugging sound added would not demonstrate this relationship. Keep the neck and nearby bottle interior in view.

This untested brief begins with the uncapped bottle already angled mouth-down above an empty bowl. Its mouth remains in air, above the receiving surface. Use a rigid, transparent bottle with no separate vent, squeezing or pump. Request only a short irregular pouring interval; exact pulse counts, rhythm and individual bubble shapes are not guaranteed.

2. Authorized first frame

Prepare an authorized photograph or accurate drawing. Show a clear rigid bottle held at a steep mouth-down angle by its original hand, with a small air space at its high end and liquid above its narrow neck. The clear mouth sits over a broad receiving bowl without touching it. Show the neck against a simple darker background.

Choose an oblique side view that includes the outlet, enough interior above it to follow a newly entering bubble, and the bowl’s rim. Avoid labels, heavy refraction and a hand over the neck. Do not draw a second hole or a continuous tube of air already reaching the top; those would change the intended intermittent counterflow.

3. Use the generator

Open the current image-to-video generator in a mode accepting your authorized first frame. Paste the complete prompt, check the available settings and cost estimate, then submit only when ready. This page supplies text; it does not upload an image or start a generation.

4. Prompt and timing

Start from my authorized clear bottle held at its existing steep mouth-down angle above the original bowl. Keep the camera, bottle shape, grip, angle and outlet position fixed. Allow liquid to leave the one open narrow mouth and fall into the bowl. During the short pour, visibly weaken the outward flow as an air pocket enters inward through that same mouth. Follow the entering air upward through the liquid inside the neck, toward the bottle’s existing upper air space. Then resume a stronger outward liquid stream from the same outlet. Keep this irregular exchange brief and readable without prescribing a metronomic rhythm. Let the bottle liquid diminish and the receiving liquid increase modestly. Keep the mouth above the bowl’s surface. No second vent, squeezing, pump, new bubbles spawning in mid-liquid, unbroken air tube, detached stream origin, bottle morph, camera move or sound-only substitute for visible air entry.

1. Opening: locate the single open neck, existing high air space and free gap to the bowl.
2. Middle: compare outward flow with the entry and inward travel of at least one visible air pocket.
3. Ending: hold the same pouring arrangement with a modest transfer completed; do not demand that the bottle empty.

These beats are author suggestions, not exact model timing guarantees. Adapt their proportions to the clip length actually available.

5. Inspect the output

After inspecting your own output, record a time or frame, visible observation and pass, fail or inconclusive judgment for each condition. A convincing ending alone does not verify the preceding action.

• The bottle retains one open mouth, fixed orientation and its original grip.
• Outgoing liquid starts at that mouth and reaches the bowl.
• At least one air pocket visibly enters through the mouth rather than appearing deep inside.
• The pocket moves inward and upward while outward flow weakens, then outflow strengthens again.
• The bottle loses some liquid while the receiving bowl gains it.
• The outlet stays above the receiving liquid throughout.
• If the neck is opaque or blurred, mark the counterflow check inconclusive even if the pour looks plausible.

6. Fix one failure

• Only a continuous stream appears: focus the prompt on one readable air-entry interval.
• Bubbles appear halfway up the bottle: keep the neck unobscured and require their entry path.
• The bottle is squeezed: make it rigid and keep the original grip shape unchanged.
• Air enters through a new hole: preserve the single mouth and remove vent language.
• The outlet becomes submerged: lower the bowl’s starting fill or increase the original gap before generating.

7. Ending and limits

Finish during the same short pour, with some liquid transferred, the original neck still in air and a visible inward air-entry event in the preceding sequence.

Save your own generated result through the available result controls, together with the authorized input, exact prompt, settings and inspection notes.

No generated pour, flow-rate measurement or fluid experiment is supplied. Visual alternation does not establish pressure, viscosity, bubble volume or the exact dynamics of a particular bottle. Sound is optional and is not evidence of the counterflow.

The ordinary pouring task follows a stream and changing levels. This task additionally requires visible air entering the same narrow outlet during a weaker outward-flow interval. A falling level or intermittent sound alone does not satisfy that added condition.