Pick Clip Length by Channel Before You Write the Prompt

## Direct answer

A five-second TikTok hook and a twelve-second PDP feature clip are different jobs. If you write one prompt for both, the camera either rushes or idles. Choose duration first, then write motion that fits: one push-in for a short hook, or hook plus label hold for a longer PDP insert. Write the on-screen claim only after the timing is fixed, or the text will fight the move.

Shorter clips need fewer adjectives and one clear subject action. Longer clips can include a second beat, but still avoid mid-shot angle changes inside a single generation. In GetVideoStudio, save presets named by channel and length so the team does not reinvent timing every afternoon. Include safe margins for captions so the final two seconds are not covered by UI chrome on each platform.

Measure success by whether the claim is readable in the final two seconds on a phone. If it is not, shorten the motion, not the product description. Duration discipline is cheaper than regenerating because the model chased too many ideas inside one clip. Write the decision down in the shot brief so the next editor does not reopen the same debate during lunch. Small process notes prevent expensive regenerations more reliably than longer prompts.