VEED Lipsync — AI Video Lip Sync Model

What is VEED Lipsync?

VEED Lipsync is a video-to-video model that re-syncs the lips of any talking-head video to a new speech audio track. Given a source video and an audio clip, it analyzes the on-screen face, then regenerates the mouth shapes and speech timing so the person appears to naturally speak the new audio — no manual keyframing, rotoscoping, or frame-by-frame animation required. Built by VEED and served through fal.ai, it is designed for realistic, production-grade lip synchronization across any aspect ratio.

The model works with existing footage, AI-generated avatars, and stock clips alike. Because it accepts any audio input, it slots directly into text-to-speech and dubbing pipelines: generate a voice track in a new language or with new dialogue, feed it alongside the original video, and get back a clean MP4 with matched lip motion.

Key Features

• Audio-driven lip resync onto any face in a source video, preserving the original identity and background.
• Format flexibility: video inputs in MP4, MOV, WebM, M4V, and GIF; audio in MP3, OGG, WAV, M4A, and AAC.
• Any aspect ratio — vertical, square, or widescreen all supported.
• TTS-compatible: works seamlessly with synthetic voice tracks for dubbing and localization.
• Simple two-input API: just video_url and audio_url.

Best Use Cases

• Dubbing and localization — swap the audio for a translated voice track and re-sync lips for natural-looking localized content.
• Video rephrasing — change what a speaker says without re-shooting the scene.
• AI avatars and UGC ads — drive synthetic presenters or influencers with fresh scripts.
• Course and training content — update narration while keeping the on-camera talent.

Front-facing subjects with a clearly visible, well-lit face and minimal head movement produce the most convincing results.

Prompt Tips and Output Quality

VEED Lipsync has no text prompt — output quality is governed entirely by your two inputs. Use clean, high-quality speech audio with minimal background noise for the tightest sync. Choose source video where the face is unobstructed, sharp, and centered; heavy motion, occlusions, or profile angles reduce accuracy. Match the audio duration to the video length so the whole clip is covered. Expect roughly 2 to 2.5 minutes of processing per minute of input video.

FAQs

What does VEED Lipsync do? It re-syncs the lips in an existing video to a new audio track, making the person appear to speak the new speech naturally.

What inputs does it need? Two: a source video URL and a speech audio URL.

Can I use text-to-speech audio? Yes. Any audio works, including TTS output, which makes it ideal for dubbing and localization workflows.

What video and audio formats are supported? Video: MP4, MOV, WebM, M4V, GIF. Audio: MP3, OGG, WAV, M4A, AAC. Any aspect ratio is accepted.

How long does generation take? Approximately 2 to 2.5 minutes of processing per minute of input video.

What produces the best results? Clear, well-lit, front-facing faces with minimal head movement, paired with clean, high-quality audio.