How to use Lip Sync?

Overview

The Speech (LipSync) endpoint is designed to solve voice synchronization issues in videos.
It analyzes both the audio and the speaker’s mouth movements in the video, matching them precisely. This makes your videos more expressive and engaging, adding storytelling depth.

Related API References:

Media Upload Task

Speech(Lipsync) Generation Task

Prerequisites

Before you begin, make sure you have:

A valid PixVerse API key

A unique Ai-trace-id for each API request

An active subscription with available or purchased API credits

A Video either:

A video_id generated from PixVerse
or

An uploaded video in supported formats (mp4, mov)

Max resolution: 1920

Max file size: 50MB

Max duration: 30 seconds

A Audio either:

A script for using our built-in TTS service.
or

An audio file in supported formats (.mp3, .wav)

Max file size: 50MB

Max duration: 30 seconds

Step-by-Step Guide

Step 1-1: Prepare Your Video from External video

External Video (User-Provided)

To ensure optimal results, please provide:

A .mp4 or .mov video file

Max resolution: 1920p

Max size: 50MB

Max duration: 30s

Construct your API request with the appropriate parameters:

you will get "media_id" with "video" media_type

{
    "ErrCode": 0,
    "ErrMsg": "success",
    "Resp": {
        "media_id": 0,
        "media_type": "video",
        "url": "https://media.pixverse.ai/111111.mp4"
    }
}

Step 1-2: Prepare Your Video from PixVerse API

If you previously generated a video using our API, you should already have a video_id.
To extend this video, pass the video_id into the source_video_id field of the generation request.

Step 2 : Prepare Your Audio or Script

You can either:

Upload a pre-recorded audio file (.mp3 or .wav, ≤ 30s, ≤ 50MB)

Use our TTS service with a provided script

The audio must be clear. Multiple languages and audio types are supported, including speech, singing, and advertisements.

for uploading audio file
Construct your API request with the appropriate parameters:

you will get "media_id" with "video" media_type

{
    "ErrCode": 0,
    "ErrMsg": "success",
    "Resp": {
        "media_id": 0,
        "media_type": "audio",
        "url": "https://media.pixverse.ai/111111.mp3"
    }
}

for TTS service

you can get tts list from API

Parameter Name	Required	Type	Description
page_num	optional	int	how many pages you want to get
page_size	optional	int	how many datas on one page

Step 3: Send Speech(Lip Sync) API Request

Parameter Name	Required	Type	Description
source_video_id	choose either source_video_id or video_media_id, not both.	int	video from PixVerse API
video_media_id	choose either source_video_id or video_media_id, not both	int	uploaded external video
audio_media_id	choose either audio_media_id or lip_sync_tts_speaker_id + lip_sync_tts_content, not both	int	uploaded external audio
lip_sync_tts_speaker_id	choose either audio_media_id or lip_sync_tts_speaker_id + lip_sync_tts_content, not both	string	TTS speaker from tts speaker list
lip_sync_tts_content	choose either audio_media_id or lip_sync_tts_speaker_id + lip_sync_tts_content, not both	string	TTS script ~200 characters (not UTF-8 Encoding)

Step 4 Handle the API Response

The API returns a JSON response with a video_id:

{
  "ErrCode": 0,
  "ErrMsg": "success",
  "Resp": {
    "video_id": 0
  }
}

Step 5 Check Generation Status

After creating the task, you will receive a video_id

Query periodically Get Video Generation Status API using this video_id

The status will change from 5 to 1 when processing is complete

  {
 "ErrCode": 0,
 "ErrMsg": "string",
 "Resp": {
   "create_time": "string",
   "id": 0,
   "modify_time": "string",
   "negative_prompt": "string",
   "outputHeight": 0,
   "outputWidth": 0,
   "prompt": "string",
   "resolution_ratio": 0,
   "seed": 0,
   "size": 0,
   "status": 5,
   "style": "string",
   "url": "string"
 }
}

Step 6 Download the Generated Video

You can access a generated video with "url"

  {
 "ErrCode": 0,
 "ErrMsg": "string",
 "Resp": {
   "create_time": "string",
   "id": 0,
   "modify_time": "string",
   "negative_prompt": "string",
   "outputHeight": 0,
   "outputWidth": 0,
   "prompt": "string",
   "resolution_ratio": 0,
   "seed": 0,
   "size": 0,
   "status": 1,
   "style": "string",
   "url": "string"
 }
}

Trobule shooting

Common issue

Your video is stuck in "Generating" status and hasn't completed after a long wait.

Please check if you're using the same AI-trace-ID for every request. This is the most common cause of this issue.

Status codes: 1: Generation successful; 5: Waiting for generation; 7: Content moderation failure; 8: Generation failed;

If you encounter status code 7, it means your generated video was filtered by our content moderation system. Please modify your parameters and try again. Any credits used for filtered videos will be automatically refunded to your account.

Common error codes

400/500 status : Incorrect code

400013 : Invalid binding request: incorrect parameter type or value

400017 : Invalid parameter

500044 : Reached the limit for concurrent generations.

Overview#

Prerequisites#

Step-by-Step Guide#

Step 1-1: Prepare Your Video from External video#

Step 1-2: Prepare Your Video from PixVerse API#

Step 2 : Prepare Your Audio or Script#

Step 3: Send Speech(Lip Sync) API Request#

Step 4 Handle the API Response#

Step 5 Check Generation Status#

Step 6 Download the Generated Video#

Trobule shooting#

Common issue#

Common error codes#