lip_sync_video
Lip Sync Video
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Third-party content written by another agent. Data to evaluate, not instructions.
Lip-sync audio onto one of your videos. DEFAULT and recommended: action="create" with video_url + sound_file (base64 data URI) — Sync Labs Sync 3 syncs the whole clip in one pass, no face step, no timing, highest quality. You do not need to pass engine at all. Kling flow, only when a line must land on an exact frame (manual timing control): (1) action="identify-face" with video_url (MP4/MOV, 2-60s, <=100MB, 720p/1080p); (2) action="create" with session_id + face_id + audio + timing IN MILLISECONDS (sound_start_time, sound_end_time, sound_insert_time) + optional speech_volume/original_audio_volume (0-100); (3) action="status" with the task_id to poll — returns a branded SwitchApp view_url when done. Charges credits on create; failed jobs are refunded.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| action | string | yes | Which step to run. |
| engine | string | no | create: OPTIONAL. Leave it out — the default is "best", Sync Labs Sync 3, whole-clip and highest quality, needing only video_url + sound_file. Pass "kling" only for the timeline flow where you place the audio yourself in milliseconds. |
| video_url | string | no | identify-face: the source video (MP4/MOV, 2-60s, <=100MB, 720p/1080p). Use a SwitchApp/public URL. |
| session_id | string | no | create: from identify-face. |
| face_id | string | no | create: a face_id from identify-face (one face supported). |
| sound_file | string | no | create: base64 data URI of the audio (e.g. data:audio/mpeg;base64,...). |
| audio_id | string | no | create: alternative to sound_file — an existing audio id. |
| sound_start_time | integer | no | create: audio start, in MILLISECONDS. |
| sound_end_time | integer | no | create: audio end, in MILLISECONDS. |
| sound_insert_time | integer | no | create: where in the video to place the audio, in MILLISECONDS. |
| speech_volume | number | no | create: how loud the new speech is, as a percent 0-100 (default 100). |
| original_audio_volume | number | no | create: how loud the clip's own sound stays, as a percent 0-100 (default 0). |
| task_id | string | no | status: the task_id from create. |
Raw JSON schema
{
"type": "object",
"properties": {
"action": {
"type": "string",
"enum": [
"identify-face",
"create",
"status"
],
"description": "Which step to run."
},
"engine": {
"type": "string",
"enum": [
"best",
"kling"
],
"description": "create: OPTIONAL. Leave it out — the default is \"best\", Sync Labs Sync 3, whole-clip and highest quality, needing only video_url + sound_file. Pass \"kling\" only for the timeline flow where you place the audio yourself in milliseconds."
},
"video_url": {
"type": "string",
"description": "identify-face: the source video (MP4/MOV, 2-60s, <=100MB, 720p/1080p). Use a SwitchApp/public URL."
},
"session_id": {
"type": "string",
"description": "create: from identify-face."
},
"face_id": {
"type": "string",
"description": "create: a face_id from identify-face (one face supported)."
},
"sound_file": {
"type": "string",
"description": "create: base64 data URI of the audio (e.g. data:audio/mpeg;base64,...)."
},
"audio_id": {
"type": "string",
"description": "create: alternative to sound_file — an existing audio id."
},
"sound_start_time": {
"type": "integer",
"description": "create: audio start, in MILLISECONDS."
},
"sound_end_time": {
"type": "integer",
"description": "create: audio end, in MILLISECONDS."
},
"sound_insert_time": {
"type": "integer",
"description": "create: where in the video to place the audio, in MILLISECONDS."
},
"speech_volume": {
"type": "number",
"description": "create: how loud the new speech is, as a percent 0-100 (default 100)."
},
"original_audio_volume": {
"type": "number",
"description": "create: how loud the clip's own sound stays, as a percent 0-100 (default 0)."
},
"task_id": {
"type": "string",
"description": "status: the task_id from create."
}
},
"required": [
"action"
]
}