Describe the story and the AI cuts it like a trailer - wide establishing shots, a build, a hard stop. You write the premise, not the shot list.
A trailer is a specific form: wide establishing shots, an escalating middle, a hard stop. This tool takes your premise and generates footage in that shape, rather than giving you a generic clip you then have to cut into a trailer yourself.
The premise, the mood, the genre. "A lighthouse keeper finds something in the water. Slow dread, cold blues." is enough to start.
Aspect ratio and length. 16:9 reads as cinema, 9:16 as a teaser for a feed.
About a minute.
An MP4, ready to post or to cut into something longer.
Describe the build and the AI follows it - establishing, escalation, cut to black.
Horror, sci-fi, romance, a fake trailer for your group chat. The prompt decides.
No timeline, no sound library, no export settings.
New accounts get 30 credits. No card.
Show people the feel of the thing before it exists.
The joke lands better when it actually looks like a trailer.
A minute of mood does more than a deck for a visual idea.
Not as separate tracks you can edit. Some models generate audio with the clip; for a scored trailer with narration, take the video out and lay sound over it in any editor.
A few seconds per generation. For a full trailer, generate several shots and cut them together - that is how most people use it.
Do not. Describing an existing franchise's characters and settings puts you on the wrong side of someone's copyright, whatever the tool produces.
Premise plus mood plus camera. "A lighthouse keeper finds something in the water" tells the AI the story; "slow dread, cold blues, drifting wide shots" tells it how to shoot it. The second half is what makes it read as a trailer.