The hardest problem in AI video is not photorealism. It is not smooth camera movement. It is lip sync — making a character’s mouth move in perfect synchronization with spoken words. Get it slightly wrong, and the uncanny valley swallows the entire video. The character stops being a character and becomes a creepy puppet.

Lovart’s **Seedance 2.0** includes native audio-visual sync — meaning the model generates lip movements that match the spoken audio, in whatever language you specify. This guide covers how to create lip-synced AI characters for marketing videos, educational content, product explainers, and multi-language localization.

Step 1: Generate Your Character

Start with a static character image. Use **Nano Banana Pro** with **Identity Lock** to ensure the character remains identical across all subsequent video frames.

*”Generate a friendly, professional-looking spokesperson character. Approachable expression, business casual attire, clean background. The character should look directly at the camera. Nano Banana Pro.”*

Place the character on your ChatCanvas. Enable **Identity Lock** (lock icon in toolbar, click the character). This ensures the character’s face remains identical throughout the video generation.

Step 2: Create a Script

Write your script in plain text. Example for a 15-second product explainer:

*”Hi, I’m Sarah. Meet our new wireless earbuds. They have 30 hours of battery life, active noise cancellation, and they pair with your phone in under two seconds. Available now at the link in our bio.”*

Seedance 2.0 generates spoken audio from your text script — in the language you write it in. English, Japanese, Korean, Spanish, German — the model handles multiple languages with appropriate lip movements for each language’s phonemes.

Step 3: Generate the Lip-Synced Video

Prompt: *”Seedance 2.0: the character from the canvas, speaking the following script directly to camera. Natural, conversational pacing. The character should gesture occasionally — a slight hand movement at key points. Background remains clean and consistent. 15 seconds. Script: [paste your script].”*

The model generates:

Refining: If the lip sync looks slightly off: *”Tighten the lip sync — the mouth movements are lagging the audio by about 100ms.”* If the character’s expression is wrong: *”Make the character’s expression warmer — more smile, more engaged, less corporate.”*

Step 4: Multi-Language Localization

This is where AI lip sync becomes transformative. Generate the same video in multiple languages without re-recording a single frame.

1. Translate your script into the target language (use Lovart’s text prompts or external translation).

2. Prompt: *”Same video, same character. Script in Japanese: [Japanese script]. Match lip sync to Japanese phonemes.”*

3. The model generates the same character delivering the same performance, but with lip movements synchronized to Japanese speech patterns.

One video, five languages, zero reshoots. For brands operating in multiple markets, this collapses localization from a multi-week production process into a single afternoon.

FAQ

Q: Does Seedance 2.0 generate the audio voice as well as lip sync?

A: Yes. Seedance generates a synthetic voice matching the script and language. Voice quality is natural but not indistinguishable from human voice actors. For professional broadcast, you can replace the generated audio with a professionally recorded voiceover — the lip movements will still match (the sync is visual, not audio-dependent).

Q: How long can a lip-sync video be?

A: Up to 15 seconds per generation for Seedance 2.0. For longer videos, generate in 15-second segments and assemble. The character remains consistent across segments if Identity Lock is active and you stay in the same ChatCanvas session.

Internal Links

| Anchor Text | Target |

|————-|——–|

| Nano Banana complete guide | `/blog/nano-banana-ai-complete-guide-lovart-image-model` |

| Veo 3 comparison | `/blog/veo-3-vs-lovart-video-generation-comparison` |

| ChatCanvas getting started | `/blog/05-pillar-getting-started-lovart` |

| Lovart signup | `https://lovart.ai/signup` |

*How-To article for blogs.lovart.ai. Part of AI Video 101 content cluster.*