If you've ever generated AI video, you've probably noticed a recurring problem: voices change from generation to generation, and replacing dialogue manually is time-consuming. Audio-to-Video in LTX solves this by letting you generate dynamic video clips directly from audio—with consistent voices, natural performances, and motion that follows every beat.

Unlike standard avatar tools that simply animate a face to speak, Audio-to-Video creates full scenes driven by sound. Motion, action, and camera movement are all guided by the audio itself, whether you're working with dialogue, music, or sound effects. The result is video that feels intentional, expressive, and temporally aligned — not stitched together.

Audio-to-Video is a new paradigm in AI video generation: starting from audio as the source of truth. 

What Makes Audio-to-Video Different

Audio-to-Video generates video where timing, pacing, and motion are shaped by sound. Upload dialogue, music, or sound effects, and LTX creates scenes that sync perfectly to your audio—from performance-driven dialogue and multi-character conversations to high-energy music videos and complex cinematic sequences.

You can upload audio, record directly in LTX, or use text-to-speech to generate dialogue. Once uploaded, the same voice stays consistent across every generation, even when you change shots, scenes, or camera angles. No dialogue replacement. No re-recording.

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How to Use Audio-to-Video AI

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Step 1: Set Up Your Scene

Go to Gen Space and click on the Video tab. Select Audio-to-Video from the dropdown.

You can generate straight from a prompt or upload an image as a start frame for your character.

Step 2: Add Your Audio

You have three options:

• Record audio directly in LTX
• Use the text-to-speech feature
• Upload audio clips up to 20 seconds long

LTX supports common audio formats including MP3, WAV, AAC, OGG, MOV, and M4A.

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Step 3: Write Your Prompt

Add scene direction to guide the visuals. Audio-to-Video responds to simple, intuitive prompts—just describe what you want to see.

Audio-to-Video usually detects speech automatically from the audio, so you often don't need to mention dialogue in your prompt. If you notice issues with speech detection, add a simple line like 'character speaks' or 'the person talks.'

Step 4: Generate

Hit Generate, and LTX creates a video sequence where motion, timing, and performance are all shaped by the audio.

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What You Can Create with Audio-to-Video

Performance-Driven Dialogue

Audio-to-Video understands emotion and intent in the audio, so performances feel natural. Characters don't just speak—they move, gesture, and perform actions while the camera responds to audio cues. The result is video that feels naturally synced, not adjusted after the fact.

Music Videos

Audio-to-Video does more than lipsync, it directs performance from audio. It understands rhythm and beat, so movement, actions, and timing perfectly align with the music. This makes it ideal for music videos, performance-driven scenes, and any content where pacing matters.

For best results with music videos, isolate vocals in your audio file. Instrument stems also help, especially for rhythm and dance sequences. Keep in mind that it won't hit every beat perfectly—but neither do most music videos.

Music-driven scenes work with instruments and singing, locking the pacing and motion to the beat, so you can create a final-pixel video that feels consistent, natural and intentional.

AI Influencers and Branded Content

Audio-to-Video is ideal for building AI influencers or creating consistent branded characters. Give your AI influencer the personality, tone, and energy that fits the brand or story, and the voice stays the same across every generation.

Multi-Character Scenes

Audio-to-Video also works with multi-character scenes. Use dialogue and timing in the audio to coordinate interactions, reactions, and actions between characters. The model recognizes each voice and generates video accordingly.

Scale Voice-First Content Across Formats

One audio file generates video for multiple platforms in seconds. Upload a podcast episode, tutorial, or interview, and Audio-to-Video creates animated scenes that match your pacing and tone. The same voice drives different visuals, so you can publish clips across YouTube, Instagram, and TikTok without re-recording or manual editing for each format.

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Tips for Getting the Best Results

Align Voice with Character

Match the personality, age, and gender of the voice to your character for more believable performances. The closer the voice fits the character, the more natural the result.

Start with the Right Expression and Pose

For best results, use a start frame where the speaker's mouth is closed. The expression should be neutral or match the emotion in your audio. If your audio sounds excited, start with an excited expression. This helps the model generate consistent, believable performances.

Layer Sound Intentionally

Add music or sound effects directly into your audio file before generating. This helps drive timing and motion and often saves time compared to adding effects later. Adding light ambient sound that fits the scene can also improve results.

Keep Dialogue Clear

Avoid overlapping speech between multiple voices—like songs with vocal ad-libs or multiple people talking at once. The model works best when each voice is distinct and clear.

Use Sound Effects Strategically

For sound effects, it helps to identify what makes the sound in your prompt. This gives you creative flexibility—for example, you can have a human character make non-human sounds, like a man doing a cat voice with his mouth.

Start with Distinct Voices

If you're working with dialogue between multiple characters, make sure the voices are clearly different. This helps the model assign the right voice to the right character and keeps performances accurate.

Structure Actions in Sequence

When directing actions, write prompts in sequence. Actions usually align with natural pauses in speech unless driven directly by audio cues.

Describe Who Is Speaking

In multi-character scenes, use simple descriptions: "the man in the red shirt says..." or "person with white hair responds." This helps the model assign dialogue to the right character.

Match Prompt Emotion to Audio

Your prompt should reflect how the dialogue sounds. If the voice sounds angry but the prompt says "happy," results can feel off. Describe the emotion you hear in the audio—whether that's "angry," "confused," "excited," or more detailed descriptions.

Combine Dialogue with Action

Write prompts that describe what's happening while someone is speaking: "the woman says 'I can't believe it' while walking away from the camera." This gives the model direction for both the dialogue and the performance.

Troubleshooting Issues

If you notice a frozen first frame or lip sync that feels off, try adding a short audio buffer at the beginning of your file. If issues persist, switching to a different voice is a last resort, but often adjusting the prompt or start frame works better.

Why Start from Audio?

Uploading or recording audio gives you a consistent, high-quality lip-synced voice across generations. This keeps dialogue stable while visuals evolve. You can change a shot, adjust a scene, or add camera moves—and the voice stays consistent across every generation.

Sound effects can drive entire scenes, from music videos to brand advertising. Let the audio direct the action where every beat lands perfectly.

Ready to try Audio-to-Video? Head to LTX and start generating video from audio today.