Sync.so Lipsync 2 Pro Serverless API

Lipsync-2-Pro seamlessly synchronizes lips in videos for instant, high-quality multilingual content creation.

~222.43s
POST /v2/sync.so-lipsync-2-pro · submit + poll
 1# pip install "segmind>=1.1.0"
 2# export SEGMIND_API_KEY="YOUR_API_KEY"
 3from segmind import SegmindClient, InferenceFailed, InferenceTimeout
 4
 5# Async (v2) — recommended for long-running / video models.
 6# run() blocks up to 600s; submit_async + job.wait(timeout=...) sets a longer
 7# deadline and keeps the request_id so you can re-poll later.
 8client = SegmindClient()                      # reads SEGMIND_API_KEY
 9payload = {
10    "video_url": "https://segmind-resources.s3.amazonaws.com/output/a741b039-226c-43c2-9bd0-c301f058d314-UntitledVideo-ezgif.com-crop-video.mp4",
11    "audio_url": "https://segmind-resources.s3.amazonaws.com/output/80e96316-7e75-4733-b80c-049a0a6787cb-c9f17960-96b5-4119-8b7e-4ae0c9f21e2f-audio-AudioTrimmer.com-AudioTrimmer.com.mp3",
12    "sync_mode": "bounce",
13    "temperature": 0.5,
14    "auto_active_speaker_detection": False,
15    "occlusion_detection_enabled": False,
16}
17job = client.submit_async("sync.so-lipsync-2-pro", **payload)
18print(job.request_id)                         # available immediately
19try:
20    result = job.wait(timeout=900, interval=2.0)
21    print(result["status"])                  # COMPLETED
22    print(result.get("output"))              # model output (e.g. video URL)
23except InferenceTimeout as e:
24    print("still running:", e.request_id)    # re-poll later with this id
25except InferenceFailed as e:
26    print("failed:", e.detail)
27
28# Fast models (<=600s) can use the one-liner instead:
29# result = segmind.run("sync.so-lipsync-2-pro", **payload)

API Endpoint

POSThttps://api.segmind.com/v1/sync.so-lipsync-2-pro

Parameters

audio_urlrequired
string (uri)

Provides the audio URL for synchronization. Use clear audio files for precision.

video_urlrequired
string (uri)

Provides the video URL for synchronization. Use high-quality links for best results.

auto_active_speaker_detectionoptional
boolean

Detects and syncs active speaker automatically. Enable for multi-speaker scenarios.

Default: false
occlusion_detection_enabledoptional
boolean

Detects occlusion, slowing generation. Disable for faster processing.

Default: false
sync_modeoptional
string

Controls how audio and video are synchronized when their durations don't match. Default is 'bounce' for smooth looping. For detailed explanations of each option, see: https://docs.sync.so/compatibility-and-tips/media-content-tips#sync-mode-options.

Default: "bounce"
Allowed values :
"loop""bounce""cut_off""silence""remap"
temperatureoptional
number

Controls expression in lip sync. Use 0.3 for calm, 0.8 for dynamic expressions.

Default: 0.5Range: 0 - 1

Response Type

Returns: Video

Asynchronous requests (v2)

Use Async for video, long-running (>~60s), or high-concurrency workloads; Sync is simplest for fast image & LLM calls. Async submits a request and you poll it to completion.

  1. 1
    POST /v2/sync.so-lipsync-2-pro

    Submitreturns request_id, status_url, response_url

  2. 2
    GET /v2/requests/{id}/status

    Polluntil COMPLETED or FAILED

  3. 3
    GET /v2/requests/{id}

    Resultfinal response body

Status states

QUEUEDAccepted, waiting for a worker
PROCESSINGRunning on a worker
COMPLETEDDone — result body is ready
FAILEDErrored (incl. content/RAI blocks)
  • A FAILED request is served as HTTP 422 — the body still carries the error detail.
  • An unknown or expired request_id returns HTTP 404.
  • Results are retained for 1 hour, then expire.
  • Content / RAI blocks surface as FAILED, not a separate state.
  • Track completion by polling the status endpoint.

Common Error Codes

The API returns standard HTTP status codes. Detailed error messages are provided in the response body.

400

Bad Request

Invalid parameters or request format

401

Unauthorized

Missing or invalid API key

403

Forbidden

Insufficient permissions

404

Not Found

Model or endpoint not found

406

Insufficient Credits

Not enough credits to process request

429

Rate Limited

Too many requests

500

Server Error

Internal server error

502

Bad Gateway

Service temporarily unavailable

504

Timeout

Request timed out