MIND FORGE AI / PRACTICAL CREATION GUIDE
How to Make a 15-Second AI Video for Reels, TikTok & Shorts
Plan one short idea, generate a vertical motion draft, then add captions and sound in an editor. Free H3 previews offer approximately 15 seconds of silent SD video with daily limits.
Your practical workflow
- Write a single message and choose text or an authorized source image.
- Select 9:16. Test five seconds first, then choose approximately fifteen seconds if the motion works.
- Inspect the entire clip, add captions and licensed sound, then preview the crop in the destination app.
Choose one continuous shot or an edited sequence
A fifteen-second generation is one model task. It does not automatically create a hook, multiple camera angles, captions or an end card. For a first attempt, keep the subject and camera simple. For a three-shot story, generate and review separate clips, then assemble them in an editor.
The timeline below is an editing plan, not a video we have generated. Put exact product claims and wording in editable text layers so that they can be corrected without regenerating the visual.
On a narrow screen, scroll the table horizontally.
| Suggested time | Purpose | What to prepare |
|---|---|---|
| 0–3 seconds | Establish the subject | One readable visual; an optional verified headline |
| 3–10 seconds | Show one action or detail | A restrained motion clip or reviewed close-up |
| 10–15 seconds | Close the message | A text layer with a specific next step |
Frame for the interface, not just the canvas
Keep the key subject comfortably inside the frame and leave space for captions. Interface buttons and text can cover different areas in each app, so use the app's actual publishing preview instead of assuming one universal safe-area margin.
The free preset's 9:16 setting describes the aspect ratio; it is not a promise of 1080×1920 output. Check the downloaded pixel dimensions and use a model with the required delivery settings when you need a higher resolution.
Finish sound and captions as separate steps
The free H3 preview is silent. Add music, voice-over and captions in an editor you use, with appropriate rights. Watch it once without sound to test whether the message is understandable and once with sound to check timing and volume.
Check the platform's current upload requirements before publishing. YouTube's official Shorts documentation is linked below; it should not be read as a specification for every social platform.
A starting prompt to adapt
Editorial suggestion, not a verified generated result.
Review the result before another attempt
Inspect the first, middle and final frames, then watch the full clip for flashes, identity changes, sudden cuts and drifting labels. Check captions on a phone before publishing.
Common questions
Is a 15-second free preview ready for an ad campaign?
Treat it as a concept draft. Review quality and product accuracy, add text and sound, and check the destination's requirements. Silent SD does not guarantee an advertising-ready export.
Will the actual clip be exactly fifteen seconds?
The H3 preset snaps frame counts to the model's supported grid at 24 fps, so duration can differ slightly. Check the file and trim it in an editor if you need an exact length.
References
External documentation supports the specified platform rules, plan details or terminology, not performance claims about this site's models.