Step 1
Provide face media
Video plate or a model that accepts image + audio.
AI lip-sync for existing faces
Lock mouth motion to dialogue with models typed lipsync in config. Use it on plates you already shot or generated.
Kling LipSync · Prompt: Diner window portrait, dialogue-ready framing
What is AI lip sync?
Lip-sync models align mouth shapes on a face video (or still-driven clip) to a dialogue track. FairStack lists type lipsync only on this page.
Lip Sync models
2 models matched from config for this capability.
MuseTalk 1.5
$0.0015/sec
MuseTalk 1.5 is a lip synchronization model that adds natural mouth movement to existing images or video at an ultra-affordable per-second rate. The model specializes in lip sync only, driving mouth movements from audio input without generating full body motion or head movement, keeping the processing focused and the cost extremely low. With per-second billing at $0.00111 per second, it is a low-cost lip sync model available on the platform. A full minute of lip sync costs approximately $0.067, making it practical for high-volume production, batch processing, and applications where hundreds or thousands of clips need lip synchronization. The model works with both static images and existing video. Compared to premium lip sync models like Sync Lipsync 2.0 Pro at $0.083 per second, MuseTalk 1.5 is at a much lower per-use price with proportionally simpler output. Against full talking head models like Kling Avatar at $0.25, it costs a fraction but only provides mouth movement rather than full facial and body animation. Best suited for budget lip sync at scale, adding speech to portrait photos, and high-volume video lip synchronization where ultra-low cost matters most. Available on FairStack at infrastructure cost plus a 20% platform fee.
Kling LipSync
$0.017/sec
Kling LipSync Audio-to-Video is Kuaishou's lip synchronization model that matches video lip movements to provided audio input. The model analyzes the audio's phonemes and drives realistic lip movements, jaw motion, and subtle facial expressions in the source video to match the provided speech, producing natural-looking synchronized output. Powered by Kling AI's video generation technology and delivered via fal.ai, the model preserves the identity and visual characteristics of the person in the video while modifying only the mouth and jaw area. The synchronization handles various speaking speeds and accents, with best results on clear, well-recorded audio. Compared to budget lip sync models like MuseTalk at $0.00111 per second, Kling LipSync delivers higher synchronization accuracy and more natural mouth shapes. Against full talking head generation models, it focuses specifically on accurate lip sync for existing video rather than generating new video content. Best suited for video dubbing, lip sync for translated content, and music video creation where matching lip movements to audio produces convincing synchronized video. Available on FairStack at infrastructure cost plus a 20% platform fee.
How to use lip sync
Step 2
Add dialogue audio
Dry voice works better than mixed beds.
Step 3
Run a lipsync model
Picker is type=lipsync from config.
Step 4
Review phoneme edges
Re-run with cleaner audio if consonants smear.
Frequently asked questions
Which models appear? +
Config type lipsync — including Kling LipSync and MuseTalk 1.5 among the selectable set.
Still have questions? We're here to help.