How to Use Vidu for Consistent AI Video Characters
Generating one great clip is easy. Generating ten clips where the same character looks like the same person is the hard part. Vidu attacks that with reference images rather than prompt engineering.
The practical payoff is episodic content: a short series, a product demo with a recurring presenter, or an explainer where a mascot appears in every scene.
Why Does Character Consistency Matter So Much?
Viewers forgive imperfect physics. They do not forgive a character whose face changes between cuts. Consistency is the line between “AI-generated” as a novelty and AI-generated as a usable production method.
How Do You Build a Consistent Character Set?
- Shoot or pick three to five reference images of the subject from similar angles
- Choose front and three-quarter views over profiles
- Keep lighting consistent across references
- Upload them together and label each by character name
- Test with a neutral scene before writing your script
- Lock the set — do not add images mid-project
Front and three-quarter views do the heavy lifting. They give the model the most information for the least ambiguity.
How Do You Write Scenes That Hold Together?
Reference the character by the name you assigned, and keep the action simple. A character walking through a doorway holds. A character running, turning, and gesturing in one shot usually does not.
Also keep scene duration modest. Longer generations give drift more time to accumulate, so build a sequence from several short clips instead of one long one.
What Are the Known Failure Modes?
| Scenario | What happens | Fix |
|---|---|---|
| Extreme profile angle | Breaks identity | Stick to front and three-quarter |
| Three or more characters | Blends identities | Cap at two per scene |
| Rapid camera movement | Features smear | Use slow moves in dialogue shots |
| Low-res reference | Soft, generic face | Use sharp, well-lit sources |
| Mid-project reference swap | Continuity break | Lock the set at the start |
Does It Support Image-to-Video and Text-to-Video Too?
Yes. The platform also offers standard text-to-video and image-to-video with camera moves like pan, zoom, and dolly, plus a lower-latency fast mode for drafting. Use fast mode to test a scene cheaply, then regenerate the keeper at full quality.
What Does It Cost?
A free tier covers a limited number of credits. Longer clips, higher resolution, and reference-heavy scenes all cost more, so a ten-shot sequence is a paid-tier project in practice.
Quick Summary
- Vidu keeps characters recognizable by reusing reference images, not prompts.
- Build three to five front and three-quarter reference shots per character.
- Lock the reference set before you start generating scenes.
- Keep scenes short and to two characters or fewer.
- Draft in fast mode; finalise at full quality to save credits.
