The direct answer
Hook-Problem-Solution-CTA is a four-beat structure for scripting short-form video: open with a pattern-breaking hook, name a specific problem the viewer recognizes, present the solution clearly, and close with exactly one call to action — mirroring classic direct-response copy compressed into a 15-60 second video.
Why one CTA, not three
Multiple competing calls to action at the end of a short video dilute the single action you actually want — comment, follow, click, or buy. Choosing one and repeating it clearly outperforms a scattershot close in almost every format.
Pacing each beat
In a 30-second video, the hook typically needs 3 seconds or less, the problem 5-8 seconds, the solution 12-15 seconds, and the CTA the final 3-5 seconds — with the understanding that the hook and CTA are non-negotiable while the problem and solution sections can flex with content complexity.