---
title: "Lip Sync"
method: POST
path: "/v1/lip-sync"
tags: ["Video Projects"]
---

# Lip Sync

`POST /v1/lip-sync`

**What this API does**

Create the same Lip Sync you can make in the browser, but programmatically, so you can automate it, run it at scale, or connect it to your own app or workflow.
    
**Good for**
- Automation and batch processing  
- Adding lip sync into apps, pipelines, or tools  

**How it works (3 steps)**
1) Upload your inputs (video, image, or audio) with [Generate Upload URLs](https://docs.magichour.ai/api-reference/files/generate-asset-upload-urls) and copy the `file_path`.  
2) Send a request to create a lip sync job with the basic fields.  
3) Check the job status until it's `complete`, then download the result from `downloads`.

**Key options**
- Inputs: usually a file, sometimes a YouTube link, depending on project type  
- Resolution: free users are limited to 576px; higher plans unlock HD and larger sizes  
- Extra fields: e.g. `face_swap_mode`, `start_seconds`/`end_seconds`, or a text prompt  

**Cost**  
Credits are only charged for the frames that actually render. You'll see an estimate when the job is queued, and the final total after it's done.

For detailed examples, see the [product page](https://magichour.ai/products/lip-sync).

## Request body

- object
  - `name` string — Give your video a custom name for easy identification.
  - `start_seconds` number, float, required — Start time of your clip (seconds). Must be ≥ 0.
  - `end_seconds` number, float, required — End time of your clip (seconds). Must be greater than start_seconds.
  - `max_fps_limit` number — Defines the maximum FPS (frames per second) for the output video. If the input video's FPS is lower than this limit, the output video will retain the input FPS. This is useful for reducing unnecessary frame usage in scenarios where high FPS is not required.
  - `assets` object, required — Provide the assets for lip-sync. For video, The `video_source` field determines whether `video_file_path` or `youtube_url` field is used
    - `audio_file_path` string, required — The path of the audio file. This value is either - a direct URL to the video file - `file_path` field from the response of the [upload urls API](https://docs.magichour.ai/api-reference/files/generate-asset-upload-urls). See the [file upload guide](https://docs.magichour.ai/api-reference/files/generate-asset-upload-urls#input-file) for details.
    - `video_source` 'file' | 'youtube', required — Choose your video source.
    - `video_file_path` string — Your video file. Required if `video_source` is `file`. This value is either - a direct URL to the video file - `file_path` field from the response of the [upload urls API](https://docs.magichour.ai/api-reference/files/generate-asset-upload-urls). See the [file upload guide](https://docs.magichour.ai/api-reference/files/generate-asset-upload-urls#input-file) for details.
    - `youtube_url` string, uri — YouTube URL (required if `video_source` is `youtube`).
  - `style` object — Attributes used to dictate the style of the output
    - `generation_mode` 'lite' | 'standard' | 'pro' — A specific version of our lip sync system, optimized for different needs. * `lite` - Fast and affordable lip sync - best for simple videos. Costs 1 credit per frame of video. * `standard` - Natural, accurate lip sync - best for most creators. Costs 1 credit per frame of video. * `pro` - Premium fidelity with enhanced detail - best for professionals. Costs 2 credits per frame of video. Note: `standard` and `pro` are only available for users on Creator, Pro, and Business tiers.

## Response `200`

Success

- object — Success
  - `id` string, required — Unique ID of the video. Use it with the [Get video Project API](https://docs.magichour.ai/api-reference/video-projects/get-video-details) to fetch status and downloads.
  - `credits_charged` integer, required — The amount of credits deducted from your account to generate the video. If the status is not 'complete', this value is an estimate and may be adjusted upon completion based on the actual FPS of the output video. If video generation fails, credits will be refunded, and this field will be updated to include the refund.

## Other responses

- `400` — Invalid Request
- `401` — Unauthorized
- `402` — Payment Required
- `404` — Not Found
- `422` — Unprocessable Entity

---

[API](https://skmtc.net/magichourhq/apis/magic-hour-api.md) · [All operations](https://skmtc.net/magichourhq/apis/magic-hour-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/magichourhq/magic-hour-api/revisions/941298cfb29f/schema)