
LTX Lipsync
Match speech to natural facial motion with an audio track and optional reference portrait.
- • Upload 5–20 seconds of audio
- • Add an optional portrait and prompt
- • Choose resolution and generate
Focused Post-Generation Workflows
Use the same workspace to create synchronized talking-head clips or extend an existing scene. Each tool keeps its original interface fields, validation, endpoint, and credit calculation.

Match speech to natural facial motion with an audio track and optional reference portrait.

Continue an MP4 beyond its last frame while guiding motion and scene direction with a prompt.
Use the same flexible credit packs for LTX Lipsync and Video Extender. One-time purchase, no subscription required.
No. Lipsync and Video Extender keep their existing upload, task creation, polling, validation, and credit behavior.
The duration is rounded to whole seconds. 480p and 720p use 1 credit per second; 1080p uses 2 credits per second.
Video Extender uses 3 credits for each selected second of extension.
Open My Work in the studio to view the same generation history used by your profile.
Choose LTX Lipsync, upload 5–20 seconds of speech, and add a portrait if you want to guide the speaker’s appearance. Set the output resolution, add any useful direction, then generate and review the finished clip in the preview or My Work.
Choose Video Extender and upload an MP4. Pick how many seconds to add, describe what should happen after the final frame, and generate. The tool uses the end of your source video as the visual handoff into the new continuation.
Describe the next action, camera movement, and details that should remain continuous. For example, say where the subject moves, whether the camera follows, and whether the lighting or background should stay unchanged.
Use Lipsync when speech needs to drive natural mouth and facial motion. Use Video Extender when the existing clip should continue beyond its last frame. If you need to create a new scene instead, start in the AI Video Generator.
Switch between Lipsync and Video Extender without leaving the studio.
Open AI Video Tools