GET

/v1/schemas/fal/video/fal-ai%2Fheygen%2Fv3%2Flipsync%2Fspeed

Accept:

kind inputactivity videohash d29e5ad3…extracted Jul 6, 2026version currentsource upstream spec ↗

Request body

9 properties · 2 required · 0 $defs

property	type	description	constraints
audio_url*	string	URL of the replacement audio file.
video_url*	string	URL of the source video to lip-sync.
enable_speech_enhancement	boolean	Enhance the replacement audio quality.	default: false
end_time	number	End time in seconds for partial lipsync.	n ≥ 0 · nullable
disable_music_track	boolean	Remove background music from the source video.	default: false
enable_caption	boolean	Generate captions in the output video.	default: false
start_time	number	Start time in seconds for partial lipsync.	n ≥ 0 · nullable
title	string	Optional title for the lipsync job.	nullable
enable_dynamic_duration	boolean	Allow duration adjustment to match the new audio.	default: true

Validate a payload

before you spend tokens

shell

$ curl -X POST https://modelschemas.com/v1/validate \
    -d '{"provider":"fal","endpointId":"fal-ai/heygen/v3/lipsync/speed","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}