> ## Documentation Index
> Fetch the complete documentation index at: https://apidoc.cometapi.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Create a Kling advanced lip-sync task
> Create advanced lip-sync video tasks via CometAPI Kling POST /kling/v1/videos/advanced-lip-sync, submit audio and counterpart settings to generate synced results.
Use this endpoint to create an advanced lip-sync task after you already identified faces in the source video.
## Before you call it
* Start with [Lip-Sync](./lip-sync) to get the `session_id` and available `face_id` values
* Build one or more `face_choose` entries that map each face to an audio segment
* Use `audio_id` for audio produced by a prior task, or `sound_file` for a hosted audio file
* Send timing fields in milliseconds. For example, `sound_start_time: "0"` and `sound_end_time: "2000"` select the first 2 seconds.
* Make sure the clipped audio segment is at least 2000 ms and does not exceed the source audio duration
* Set `callback_url` or `external_task_id` only when you need webhook delivery or your own tracking id
## Task flow
Run [Lip-Sync](./lip-sync) on the source video and keep the returned `session_id` plus the target `face_id` values.
Submit `session_id` and the `face_choose` array through this endpoint.
Save the returned task id for status checks and final result retrieval.
For the complete parameter reference, see the [official Kling documentation](https://kling.ai/document-api/apiReference/model/lipSync).
## OpenAPI
````yaml api/openapi/video/kling/post-counterpart-creating-tasks.openapi.json POST /kling/v1/videos/advanced-lip-sync
openapi: 3.1.0
info:
title: Counterpart Creating Tasks API
version: 1.0.0
description: >-
Create an advanced Kling lip-sync task after face identification has
produced a session id and face ids.
servers:
- url: https://api.cometapi.com
security:
- bearerAuth: []
paths:
/kling/v1/videos/advanced-lip-sync:
post:
summary: Create an advanced Kling lip-sync task
description: >-
Submit the `session_id` returned by face identification plus one or more
`face_choose` mappings that connect target faces to audio segments.
operationId: counterpart_creating_tasks
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- session_id
- face_choose
properties:
session_id:
type: string
description: Session id returned by identify-face.
face_choose:
type: array
description: One or more face/audio mappings to synthesize.
minItems: 1
items:
type: object
required:
- face_id
properties:
face_id:
type: string
description: Face id returned by identify-face.
audio_id:
type: string
description: Audio id from a prior audio task.
sound_file:
type: string
description: Public audio URL when you provide your own audio.
sound_start_time:
type: string
description: Start time within the audio source, in milliseconds.
sound_end_time:
type: string
description: >-
End time within the audio source, in milliseconds. The
clipped segment must be at least 2000 ms and must not
exceed the source audio duration.
sound_insert_time:
type: string
description: Insertion time in the target video, in milliseconds.
sound_volume:
type: number
description: Volume for the inserted audio.
original_sound_volume:
type: number
description: Volume for the original video audio.
callback_url:
type: string
description: Webhook URL to receive task status updates.
external_task_id:
type: string
description: >-
Custom task id for your own tracking. Must be unique per
account.
default:
session_id:
face_choose:
- face_id:
sound_file: https://your-audio-host/speech.wav
sound_start_time: '0'
sound_end_time: '2000'
sound_insert_time: '0'
sound_volume: 1
original_sound_volume: 0
examples:
Default:
summary: Advanced lip-sync request
value:
session_id:
face_choose:
- face_id:
sound_file: https://your-audio-host/speech.wav
sound_start_time: '0'
sound_end_time: '2000'
sound_insert_time: '0'
sound_volume: 1
original_sound_volume: 0
responses:
'200':
description: Task accepted.
content:
application/json:
schema:
type: object
required:
- code
- message
- data
properties:
code:
type: integer
message:
type: string
data:
type: object
properties:
task_id:
type: string
task_status:
type: string
created_at:
type: integer
updated_at:
type: integer
additionalProperties: true
x-codeSamples:
- lang: Shell
label: Default
source: |
curl https://api.cometapi.com/kling/v1/videos/advanced-lip-sync \
-H "Authorization: Bearer $COMETAPI_KEY" \
-H "Content-Type: application/json" \
-d '{
"session_id": "",
"face_choose": [
{
"face_id": "",
"sound_file": "https://your-audio-host/speech.wav",
"sound_start_time": "0",
"sound_end_time": "2000",
"sound_insert_time": "0",
"sound_volume": 1,
"original_sound_volume": 0
}
]
}'
- lang: Python
label: Default
source: |
import os
import requests
response = requests.post(
"https://api.cometapi.com/kling/v1/videos/advanced-lip-sync",
headers={"Authorization": "Bearer " + os.environ["COMETAPI_KEY"]},
json={
"session_id": "",
"face_choose": [
{
"face_id": "",
"sound_file": "https://your-audio-host/speech.wav",
"sound_start_time": "0",
"sound_end_time": "2000",
"sound_insert_time": "0",
"sound_volume": 1,
"original_sound_volume": 0
}
]
},
)
result = response.json()
print(result.get("code"), result.get("data", {}).get("task_id"))
- lang: JavaScript
label: Default
source: >
const response = await
fetch("https://api.cometapi.com/kling/v1/videos/advanced-lip-sync",
{
method: "POST",
headers: {
Authorization: `Bearer ${process.env.COMETAPI_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
"session_id": "",
"face_choose": [
{
"face_id": "",
"sound_file": "https://your-audio-host/speech.wav",
"sound_start_time": "0",
"sound_end_time": "2000",
"sound_insert_time": "0",
"sound_volume": 1,
"original_sound_volume": 0
}
]
}),
});
const result = await response.json();
console.log(result.code, result.data?.task_id);
components:
securitySchemes:
bearerAuth:
type: http
scheme: bearer
description: Bearer token authentication. Use your CometAPI key.
````