Most AI video ads are still stitched together from 5 to 10-second clips, and the joins show: the product changes shape, the lighting shifts, the voiceover drifts off the picture. Models that can render a full 30-second scene change how you plan the ad. Seedance 2.5 is one of them: it generates videos up to 30 seconds with synchronized sound from text prompts, product images, character references, motion clips and audio ideas. Here is a simple way to plan a 30-second spot as one continuous clip.

1. Write the four beats first

Before any prompt, write one line each for the hook (0–3s), the action (3–15s), the benefit (15–25s) and the call to action (25–30s). If a beat needs more than one line, the ad is trying to say too much.

2. Lock the subject with references

Seedance 2.5 accepts up to 50 references, which is enough to pin down a presenter's face, the product from several angles, the packaging and the brand colours. Gather those before you generate, so the subject stays consistent from the first frame to the last.

3. Describe camera and timing per beat

In the prompt, give each beat its own camera direction and rough timing ("0–3s: close-up of the bottle, slow push-in"). A single long clip still benefits from a shot list; it just doesn't need cuts.

4. Direct the sound in the same prompt

Because audio is generated with the video, write the voiceover line, the music mood and any sound effects into the prompt alongside the visuals, and note where the rhythm should land. That avoids the usual mismatch between a separately recorded track and the picture.

5. Check the generator before you commit

Available modes, duration, resolution and price are shown in the generator, so confirm them for your placement (9:16 for Reels and Shorts, 16:9 for YouTube) before spending credits on the full-length version.

6. Make variants by changing one beat

Once a version works, change only the hook or only the CTA for the next variant. You keep the tested middle of the ad and learn which opening or close performs better.

Disclosure: I work on marketing at Seedance TV, an independent AI video platform that is not affiliated with ByteDance. The Seedance 2.5 page on Seedance TV has the feature list and examples if you want to try this planning approach.