AI-video negative direction
Write the failure you can see.
A negative prompt is most useful when it blocks a concrete failure that would invalidate the shot. It is less useful as a long inventory of every artifact that could exist.
Start from the shot, not a universal list
A talking close-up, a product rotation and a liquid macro shot fail in different ways. The close-up may need stable facial features and restrained head motion. The product shot may need fixed packaging geometry and label orientation. The liquid shot may need believable gravity and continuous flow.
Begin with the three to eight failures that would make this specific output unusable. Keep the positive brief responsible for what you want; use negative direction for the visible outcomes you need to exclude.
Five useful failure families
Temporal stability
Use when frames do not agree with one another: flicker, lighting pulses, texture crawling, abrupt style changes, sudden cuts or a background that reconfigures during the shot.
No frame flicker, lighting pulses, background changes or abrupt cuts.
Identity and anatomy
Use when a person or character changes across the clip. Name the specific failure: facial morphing, changing hairstyle, wardrobe drift, extra fingers or duplicated limbs. Pair the negative with a positive continuity rule that states which features must remain unchanged.
Preserve the same face, hairstyle and blue jacket throughout. No facial morphing, duplicate features, extra fingers or wardrobe changes.
Product and object geometry
Use for packaging, logos, furniture, devices and other objects whose silhouette or surface details matter. Protect proportions, counts, label placement and material behavior.
No warped packaging, changing cap, mirrored label, duplicate bottle, melting edges or scale changes.
Camera behavior
Negative camera direction is valuable when the shot should be controlled. If the positive brief says “locked tripod”, exclude shake, orbit, zoom, reframing and focus breathing rather than adding another vague word such as “smooth”.
Locked camera. No shake, orbit, zoom, reframing, focus breathing or sudden perspective shift.
Physics and environment
Use when motion must obey a visible physical rule: liquid should fall with gravity, fabric should not pass through a body, and objects should not float, teleport or merge. Keep the rule close to the action it controls.
Why long negative lists fail as a workflow
A list copied from another shot may contain irrelevant or competing exclusions. It also makes diagnosis harder: if the result improves, you do not know which instruction helped. A shorter list lets you change one failure family at a time and preserve the parts that already work.
A repeatable repair loop
- Review the output and name the first visible failure that makes it unusable.
- Strengthen the matching positive preservation rule.
- Add one short negative block for that failure family.
- Keep camera, action and timing unchanged unless they caused the failure.
- Generate one controlled comparison and record what changed.
No glitches, no bad quality, no ugly image, no distortion, no blur, no noise, no artifacts, no weirdness, no errors, no problems, no unnatural anything.
Preserve bottle geometry and label orientation. No warped glass, mirrored label, duplicate bottle, lighting flicker or camera shake.
Diagnose before rerolling