Ltx 2 19b Lipsync

Ltx 2 19b Lipsync

Playground

LTX-2 Lipsync generates synchronized talking head videos from a reference image and audio input. Powered by the 19B DiT architecture, it produces high-fidelity lip-synced videos with natural head movements. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

LTX-2 19B Lipsync

LTX-2 Lipsync is an audio-driven digital human model that generates synchronized talking head videos from a reference image and audio input. Powered by the 19B-parameter DiT (Diffusion Transformer) architecture, it produces high-fidelity lip-synced videos with natural head movements and expressions.

Why Choose This?

• Audio-driven generation Simply provide an audio file and optional reference image — the model handles lip-sync, head motion, and expressions automatically.

• High-fidelity output Leverages the 19B-parameter LTX-2 architecture for detailed, temporally consistent video with natural mouth movements.

• Flexible resolution Supports 480p, 720p, and 1080p outputs to balance quality and cost.

• Variable duration Video length is automatically determined by audio duration (5-20 seconds max).

Parameters

Resolution Options

How to Use

1. Upload your audio — the audio file that drives lip-sync and determines video duration.
2. Upload your image (optional) — the reference portrait that defines the speaker’s appearance.
3. Write your prompt (optional) — describe any style or motion preferences.
4. Select resolution — 480p for iteration, 720p for balance, 1080p for final output.
5. Run — submit and download the lip-synced video.

Pricing

Billing Rules

• Base price: $0.10 (720p, 5 seconds)
• Duration: Determined by audio length (min 5s, max 20s billing)
• Resolution multiplier: 480p = 0.75×, 720p = 1×, 1080p = 1.5×
• Total cost = duration × $0.10 × resolution_multiplier / 5

Best Use Cases

• Digital Avatars — Create talking head videos for virtual presenters and avatars.
• Content Creation — Generate lip-synced videos for social media and marketing.
• Localization — Dub existing content with new audio while maintaining visual consistency.
• Accessibility — Create sign language or narrated content with synchronized visuals.
• Education — Produce instructional videos with talking head presenters.

Pro Tips

• Use clear, high-quality audio for best lip-sync results.
• Provide a front-facing portrait image with visible mouth for optimal generation.
• Use high-quality, sharp, well-lit portrait images for best results.
• Iterate at 480p to dial in results, then render at higher resolution for final output.
• Use fixed seed when comparing variations to isolate changes.

Notes

• Maximum video duration is 20 seconds (determined by audio length).
• Audio longer than 20 seconds will be truncated.
• The aspect ratio of output video is influenced by your input image.

Related Models

• LTX-2 19B Image-to-Video — Animate images with synchronized audio from text prompts.
• LTX-2 19B Text-to-Video — Generate video with audio from text only.
• InfiniteTalk — Alternative audio-driven talking head generation.

# Submit the task
curl --location --request POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/ltx-2-19b/lipsync" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}" \
--data-raw '{
    "resolution": "720p",
    "seed": -1
}'

# Get the result
curl --location --request GET "https://api.wavespeed.ai/api/v3/predictions/${requestId}/result" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}"