Kling Lip Sync API (Kling Lip Sync)

Make an existing Kling video (5 seconds or 10 seconds) “speak” according to audio or text — that is, lip sync. Combined with the image2video feature of /kling/videos (to make a photo move), it can form a complete “talking photo / digital human presentation” workflow.

This API is a single-step convenient wrapper provided by AceDataCloud, designed for common audio/text-driven scenarios; it is not a field mirror of Kling’s official multi-step “Face Recognition → Advanced Lip Sync” API. Please refer to the parameter table on this page.

API Endpoint: POST https://api.acedata.cloud/kling/lip-sync
Request Format: application/json
Response Format: application/json
Billing: 2.45 Credits per successful call (fixed)

Request Headers

Field	Value	Description
`authorization`	`Bearer ${API_KEY}`	Your API key, get it here
`content-type`	`application/json`	Request body format
`accept`	`application/json`	Response format

Request Parameters (Request Body)

Parameter	Type	Required	Default	Description
`mode`	string	Yes	—	Generation mode. Enum: `audio2video` (audio-driven), `text2video` (text-driven)
`video_id`	string	One of two	—	ID of a Kling-generated video (for example, the `video_id` returned by `/kling/videos` image2video). Only supports 5s/10s videos generated within 30 days. Choose one between `video_id` and `video_url`; they cannot be passed at the same time
`video_url`	string	One of two	—	Publicly accessible video link. Constraints: `.mp4`/`.mov`, ≤100MB, duration 2–10s, 720p/1080p only, side length 720–1920px. Choose one between this and `video_id`
`audio_url`	string	Conditional	—	Download URL of the driving audio, required when `audio2video` + `audio_type=url`. Formats `.mp3`/`.wav`/`.m4a`/`.aac`, ≤5MB
`audio_type`	string	No	`url`	Audio transfer method. Enum: `url`, `file` (effective when using `audio2video`)
`audio_file`	string	Conditional	—	Base64 of the audio file, required when `audio_type=file`. Same formats as above, ≤5MB
`text`	string	Conditional	—	Text to be read aloud, required when using `text2video`, up to 120 characters
`voice_id`	string	Conditional	—	Voice ID, required when using `text2video`
`voice_language`	string	No	`zh`	Voice language. Enum: `zh`, `en` (effective when using `text2video`)
`voice_speed`	float	No	`1.0`	Speech speed, range `0.8`–`2.0`, accurate to one decimal place (effective when using `text2video`)
`callback_url`	string	No	—	Callback address. Passing this or `async=true` enables asynchronous mode: immediately returns `task_id`, then calls back after the result is generated
`async`	boolean	No	`false`	Whether to run asynchronously. When `true`, immediately returns `task_id`, used with `/kling/tasks` polling or `callback_url` callback

Request Examples

1) Audio-driven (audio2video)

curl -X POST 'https://api.acedata.cloud/kling/lip-sync' \
  -H 'authorization: Bearer ${API_KEY}' \
  -H 'content-type: application/json' \
  -d '{
    "mode": "audio2video",
    "video_id": "895055164389466178",
    "audio_url": "https://cdn.acedata.cloud/6f7d62b18b.wav"
  }'

2) Text-driven (text2video)

curl -X POST 'https://api.acedata.cloud/kling/lip-sync' \
  -H 'authorization: Bearer ${API_KEY}' \
  -H 'content-type: application/json' \
  -d '{
    "mode": "text2video",
    "video_id": "895055164389466178",
    "text": "哥，好久不见，我一切都好，你要照顾好自己。",
    "voice_id": "genshin_vindi2",
    "voice_language": "zh",
    "voice_speed": 1.0
  }'

Response Example (Synchronous Success)

{
  "success": true,
  "task_id": "07a3ec65-9f7e-4a09-b7b7-282684082527",
  "video_id": "895055968777281546",
  "video_url": "https://cdn.acedata.cloud/assets/examples/kling/6c68c267-065b-4423-b66b-a0e4c59ee0d5-6a664a591a53.mp4",
  "duration": "4.966",
  "state": "succeed"
}

Field	Type	Description
`success`	boolean	Whether successful
`task_id`	string	ID of this task (can be used for `/kling/tasks` queries)
`video_id`	string	Kling ID of the generated video (can be used as input for the next `extend`/`lip-sync`)
`video_url`	string	URL of the generated talking video (transferred to this platform’s CDN, valid long-term)
`duration`	string	Video duration (seconds)
`state`	string	Task status: `succeed` / `failed`

Asynchronous Mode and Queries

When callback_url or async: true is passed, the API immediately returns task_id; afterwards you can:

Poll: POST /kling/tasks, body { "action": "retrieve", "id": "<task_id>" } (free)
Callback: After generation is complete, the result is POSTed to your callback_url

Complete Workflow: Talking Photo (image2video → lip-sync)

# Step 1: Animate the photo and obtain video_id
curl -X POST 'https://api.acedata.cloud/kling/videos' \
  -H 'authorization: Bearer ${API_KEY}' -H 'content-type: application/json' \
  -d '{"model":"kling-v2-1-master","action":"image2video","start_image_url":"https://cdn.acedata.cloud/4hfydw.jpg","prompt":"look at camera, natural","duration":5,"mode":"pro"}'
# → { "video_id": "895055164389466178", ... }

# Step 2: Lip-sync with audio
curl -X POST 'https://api.acedata.cloud/kling/lip-sync' \
  -H 'authorization: Bearer ${API_KEY}' -H 'content-type: application/json' \
  -d '{"mode":"audio2video","video_id":"895055164389466178","audio_url":"https://cdn.acedata.cloud/assets/examples/fish/5ade0339-5f11-487e-aacc-06a908271706-8e3fcb0e5547.mp3"}'
# → { "video_url": "https://cdn.acedata.cloud/assets/examples/kling/6c68c267-065b-4423-b66b-a0e4c59ee0d5-6a664a591a53.mp4", ... }

Error Response

{
  "success": false,
  "error": {
    "code": "bad_request",
    "message": "one of video_id or video_url is required"
  },
  "trace_id": "f07cab09-3c18-4d74-9030-64ee840d9f16",
  "task_id": "f490537f-2e5c-4739-8149-6252fba2091c"
}

HTTP	code	Meaning
400	`bad_request`	Missing or invalid parameters (e.g., mode not provided, conflict between video and audio options, text exceeds 120 characters)
401	`authorization_missing`	Missing or invalid API key
403	`forbidden`	Content was blocked by risk control
429	`too_many_requests`	Upstream concurrency limit; please retry later
500	`api_error`	Upstream or internal error

Notes

video_id must be a Kling video generated within 30 days, and must be 5s or 10s; otherwise, use video_url to provide a video that meets the constraints.
The input video is recommended to feature a clear frontal face and a single person for the best lip-sync results.
The audio/text duration should match the video duration (audio must not exceed the video length).
Billing occurs upon success (2.45 Credits/request); parameter validation failures (4xx) are not billed.

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More guides

Kling Lip Sync API (Kling Lip Sync)

Request Headers

Request Parameters (Request Body)

Request Examples

1) Audio-driven (audio2video)

2) Text-driven (text2video)

Response Example (Synchronous Success)

Asynchronous Mode and Queries

Complete Workflow: Talking Photo (image2video → lip-sync)

Error Response

Notes

​Request Headers

​Request Parameters (Request Body)

​Request Examples

​1) Audio-driven (audio2video)

​2) Text-driven (text2video)

​Response Example (Synchronous Success)

​Asynchronous Mode and Queries

​Complete Workflow: Talking Photo (image2video → lip-sync)

​Error Response

​Notes

Request Headers

Request Parameters (Request Body)

Request Examples

1) Audio-driven (audio2video)

2) Text-driven (text2video)

Response Example (Synchronous Success)

Asynchronous Mode and Queries

Complete Workflow: Talking Photo (image2video → lip-sync)

Error Response

Notes