How to Make Characters Speak in Veo 3.1: The Ultimate Guide to Dialogue, Audio & Lip-Sync

Veo 3.1 enables high-fidelity video generation with synchronous audio and realistic lip-syncing directly from text prompts. By enclosing specific speech in quotation marks—for example, A woman says, “We have to leave now.”—the model automatically matches mouth movements to the generated dialogue. Despite these capabilities, many creators struggle with high credit costs and the need for multiple expensive subscriptions to maintain character consistency across shots.

Trial and error often burns through credits quickly, making high-quality production unaffordable for most individuals. GlobalGPT addresses this by centralizing world-class AI models into a single, accessible dashboard. This eliminates the need for fragmented accounts and overcomes typical regional access restrictions.

As a comprehensive all-in-one platform, GlobalGPT allows you to switch between GPT-5.2, 클로드 4.5, 및 제미니 3 프로 to streamline your storytelling process. Our $10.8 Pro 요금제 is specifically designed for video creators, offering simultaneous access to Veo 3.1, Sora 2, and 나노 바나나 to ensure consistent characters without watermarks or heavy usage limits.

How to Make Characters Speak in Veo 3.1? (The Dialogue Formula)

To get the best results, you need to follow a specific “recipe” that combines what the camera sees with what the character says. What is Veo 3.1? This guide will help you master the latest features of the Google-backed model.

The 5-Part Prompt Structure

A professional prompt should always include the camera angle, the subject, the action, the setting, and finally the dialogue. By organizing your words this way, how to use Veo 3.1 in easy steps becomes much clearer as the AI understands exactly how to build your scene without getting confused.

• The “Quotes” Syntax Rule: The most important rule for talking characters is using double quotation marks (“”). If you want your character to say something, you must write it like this: A man says, “Hello, how are you today?”. This tells the AI to sync the character’s lip movements perfectly with the spoken words.
• Tone & Emotional Delivery: You can control how a character sounds by adding descriptive words before the dialogue. This is one of the 7 secrets to writing better AI prompts—for example, telling the AI that a character speaks in a “weary voice” or “shouts excitedly” will change the energy and feeling of the audio generation.
• Multilingual Speech: Even if you write your instructions in English, you can make characters speak other languages like Spanish or Mandarin. Simply write the words you want them to say in that language inside the quotes, and Veo 3.1 will handle the accent and lip-sync automatically.

Mastering Audio, SFX & Narration Prompts

Veo 3.1 doesn’t just do talking; it creates a full movie-like soundscape directly from your text.

• Sound Effects (SFX): You can add realistic noises to your video by using the “SFX:” tag. Whether it is the sound of thunder cracking or footsteps on a wooden floor, describing these sounds clearly helps make the video feel alive.
• Ambient Noise: To make a scene feel real, you need background sound, which is called ambient noise. By prompting for the “quiet hum of a starship” or “distant city traffic,” you fill the silence and ground the character in their environment.
• Narration vs. Dialogue: There is a big difference between a character talking on screen and a narrator talking from behind the camera. Use “A narrator says” for documentary styles where the voice describes the scene without needing to match a specific character’s mouth.
• Negative Prompting for Audio: Sometimes you only want the voice and no music. Using “No music” or “Clean dialogue only” in your prompt is a pro trick that makes it much easier to edit your video later if you want to add your own background songs.

How to Get Consistent Characters? (The “Ingredients” Workflow)

One of the biggest challenges in AI video is keeping the character’s face the same across different clips.

• The “Morphing” Problem: Without a reference image, AI tends to change the character’s hair, clothes, or face every time you generate a new shot. This makes it very hard to tell a continuous story.
• Solution: Ingredients to Video: Veo 3.1 has a special feature that lets you upload a picture of your character as an “ingredient”. You can learn how to access Google Veo 3.1 to start using this advanced tool. The AI then uses this picture as a guide to make sure the character looks the same while they are talking.
• Using Nano Banana for Ingredients: 켜짐 GlobalGPT, you can first use 나노 바나나(제미니 2.5 플래시 이미지) to create a perfect character portrait. Once you have that “master image,” you can feed it into Veo 3.1 to ensure your character stays consistent from the first shot to the last.

Cinematic Techniques for Better Lip-Sync

Just like a real movie director, how you place the camera changes how well the audience can hear and see the character speak.

• Optimal Camera Angles: For the best lip-sync, always use a “Medium Close-Up” or a “Head-and-Shoulders” shot. These angles keep the character’s mouth large and clear in the frame, making it much easier for the AI to animate the speech accurately. This is a key tip for where to use Veo 3.1 in high-quality video production.
• Shot Duration & Timing: Veo 3.1 works best with clips that are between 4 and 8 seconds long. To understand technical constraints better, check the official limits vs 148-second hack. If you try to make a character speak for too long in one shot, the audio might cut off or the lips might stop moving before the sound finishes.

The “Pro” Workflow: Replacing Veo Audio with ElevenLabs

While Veo 3.1 is great at lip-syncing, the “voices” it generates can sometimes sound a bit robotic or lack personality.

• The Native Audio Limitation: Native AI voices are good for quick drafts, but they often lack the emotional “soul” of a real human voice.
• The Hybrid Method: Many professionals generate the video in Veo 3.1 with “clean dialogue” to get the mouth movements , and then they use ElevenLabs (available on GlobalGPT) to create a much higher-quality or even a cloned version of their own voice.
• GlobalGPT Integration: The best part is that you don’t need to pay for three different websites. On GlobalGPT, you can use Veo 3.1, Sora 2, and ElevenLabs all under one $10.8 Pro Plan, saving you hundreds of dollars in subscription fees. You can even 쌍둥이자리에서 Veo 3.1 사용 for a more integrated experience.

Troubleshooting Common Veo 3.1 Issues

Even with the best prompts, you might run into a few common “bugs” that need fixing.

• Subtitles Won’t Go Away: Sometimes Veo adds text over your video that you didn’t ask for. To fix this, add “no captions” or “no subtitles” to your negative prompt.
• Wrong Character Speaks: In scenes with two people, the AI might give the dialogue to the wrong person. To avoid this, always start your dialogue prompt with the character’s specific name, like “The woman in the red jacket says…”.
• Timestamp Prompting: If you want a character to start speaking only after a few seconds of silence, you can use timestamp prompts like [00:03-00:08]. This gives you precise control over the pacing of your scene.

Is Veo 3.1 Free? Pricing & Platform Comparison

Finding access to Veo 3.1 can be difficult, as many official platforms are restricted to enterprises or certain regions.

• Official Google Vertex AI: This is designed for big companies and developers. It requires a complex setup and can be very expensive if you make a lot of mistakes during testing.
• GlobalGPT Pro Plan: For just $10.8 per month, GlobalGPT gives you a simple way to use Veo 3.1 alongside other top models like GPT-5.2, Claude 4.5, and Gemini 3 Pro. You can find more info on is Google Veo 3.1 free? or check the Veo 3.1 subscription cost. It removes the region locks and usage limits often found elsewhere.

As the technology evolves, keep an eye out for Google Veo 3.2 leaks regarding the new world model and physics engine updates.

자주 묻는 질문

Q1: What is the specific prompt syntax to make a character speak in Veo 3.1?

To trigger lip-sync, you must enclose the dialogue in double quotation marks and use a lead-in verb, such as: A woman says, "Welcome to the future." This specific formatting tells the AI to generate synchronous audio and mouth movements.

Q2: How do I maintain character consistency across multiple speaking scenes?

The most effective way is using the “동영상 재료” feature by uploading a reference image of your character. On GlobalGPT, you can generate a master character image using 나노 바나나 and then use it as an ingredient in Veo 3.1 to ensure the face stays the same.

Q3: Can I use my own voice or high-quality ElevenLabs audio with Veo 3.1?

Yes, you can use a hybrid workflow by generating the video in Veo 3.1 with “clean dialogue” and then swapping the audio with ElevenLabs (available on GlobalGPT). This method provides professional-grade voice acting while maintaining perfect lip-syncing.

Q4: Why does my Veo 3.1 video have no audio or sound effects?

This usually happens if the prompt lacks clear audio instructions or the dialogue is not in quotes. Ensure your prompt includes terms like 오디오:, Says:, 또는 SFX: to tell the model that sound generation is required for that specific clip.

Q5: How can I remove unwanted subtitles or captions from my Veo 3.1 videos?

You can prevent auto-generated text by adding “no subtitles” or “no text” to your negative prompt. Additionally, keeping your dialogue prompts under 8 seconds helps the AI focus on the visuals and audio rather than generating on-screen captions.

결론

Mastering character dialogue in Veo 3.1 is a matter of combining precise “quotes” syntax with effective character consistency tools. By using professional camera angles and managing audio triggers like SFX and ambient noise, you can transform simple prompts into expressive, talking avatars. Whether you are troubleshooting lip-sync issues or experimenting with hybrid workflows, these core techniques ensure your AI-generated stories feel both realistic and impactful.