MODEL IDsync:3@0

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sync-3

by sync.April 7, 2026

sync-3 is a lip synchronization model that processes entire shots as a single generation rather than stitching independent segments. It builds a global understanding of the speaker across all frames, enabling consistent output on close-ups, extreme face angles, partially obscured faces, and obstructed mouths. The model preserves the original speaker's style, cadence, and emotional expression across 95+ languages.

API Options

Platform-level options for task execution and delivery.

taskType stringrequiredvalue: videoInference: Identifier for the type of task being performed

taskUUID stringrequiredUUID v4: UUID v4 identifier for tracking tasks and matching async responses. Must be unique per task.

outputType stringdefault: URL: Video output type.
Allowed values1 value

outputFormat stringdefault: MP4

Specifies the file format of the generated output. The available values depend on the task type and the specific model's capabilities.

`MP4`: Widely supported video container (H.264), recommended for general use.
`WEBM`: Optimized for web delivery.
`MOV`: QuickTime format, common in professional workflows (Apple ecosystem).

Allowed values3 values

outputQuality integermin: 20max: 99default: 95: Compression quality of the output. Higher values preserve quality but increase file size.

webhookURL stringURI

Specifies a webhook URL where JSON responses will be sent via HTTP POST when generation tasks complete. For batch requests with multiple results, each completed item triggers a separate webhook call as it becomes available.

Learn more1 resource

Webhooks
PLATFORM

deliveryMethod stringdefault: async

Determines how the API delivers task results.

Allowed values1 value

: Returns an immediate acknowledgment with the task UUID. Poll for results using getResponse. Required for long-running tasks like video generation.

Learn more1 resource

Task Polling
PLATFORM

uploadEndpoint stringURI

Specifies a URL where the generated content will be automatically uploaded using the HTTP PUT method. The raw binary data of the media file is sent directly as the request body. For secure uploads to cloud storage, use presigned URLs that include temporary authentication credentials.

Common use cases:

Cloud storage: Upload directly to S3 buckets, Google Cloud Storage, or Azure Blob Storage using presigned URLs.
CDN integration: Upload to content delivery networks for immediate distribution.

// S3 presigned URL for secure upload
https://your-bucket.s3.amazonaws.com/generated/content.mp4?X-Amz-Signature=abc123&X-Amz-Expires=3600

// Google Cloud Storage presigned URL
https://storage.googleapis.com/your-bucket/content.jpg?X-Goog-Signature=xyz789

// Custom storage endpoint
https://storage.example.com/uploads/generated-image.jpg

The content data will be sent as the request body to the specified URL when generation is complete.

safety object

Content safety checking configuration for video generation.

Properties2 properties

safety » checkContent checkContent booleandefault: false: Enable or disable content safety checking.

safety » mode mode stringdefault: none

Safety checking mode for video generation.

Allowed values3 values

: Disables checking.
: Checks key frames.
: Checks all frames.

ttl integermin: 60: Time-to-live (TTL) in seconds for generated content. Only applies when outputType is URL.

includeCost booleandefault: false: Include task cost in the response.

numberResults integermin: 1max: 4default: 1: Number of results to generate. Each result uses a different seed, producing variations of the same parameters.

Inputs

Input resources for the task (images, audio, etc). These must be nested inside the inputs object.

inputs » video video stringrequired: Video input (UUID or URL).

inputs » audio audio string: Audio input (UUID or URL).

Core Parameters

Primary parameters that define the task output.

model stringrequiredvalue: sync:lipsync@3

Identifier of the model to use for generation.

Learn more3 resources

speech objectrequired*

Settings for speech generation.

Properties2 properties

speech » text text stringrequiredmin: 1max: 5000: Text to convert to speech.

speech » voice voice stringrequired: Voice identifier to use for speech generation.

Settings

Technical parameters to fine-tune the inference process. These must be nested inside the settings object.

settings » temperature temperature floatmin: 0max: 1step: 0.01default: 0.5: Expressiveness of lip sync and facial movements.

settings » activeSpeakerDetection activeSpeakerDetection object

Speaker-targeting for multi-person clips.

Properties4 properties

settings » activeSpeakerDetection » autoDetect autoDetect booleandefault: false: Automatically detect and target the active speaker.

settings » activeSpeakerDetection » boundingBoxes boundingBoxes array of arrays: Per-frame face bounding boxes across the clip. Each box is [x1, y1, x2, y2].

settings » activeSpeakerDetection » coordinates coordinates array of numbersitems: 2: [x, y] point on the target speaker's face in the selected frame.

settings » activeSpeakerDetection » frameNumber frameNumber integermin: 0: Frame index corresponding to the provided face coordinates.

settings » emotion emotion string: Emotional tone for performance re-animation.
Allowed values6 values

settings » mode mode string: Controls the region of facial animation applied during lip sync.
Allowed values3 values

settings » occlusionDetection occlusionDetection booleandefault: false: Enable occlusion handling for obstructed faces.

settings » segments segments array of objectsmin items: 1

Time segments with audio sources for segmented lip sync workflows.

Properties5 properties

settings » segments » startTime startTime floatrequiredmin: 0step: 0.01: Start time in seconds for the segment.

settings » segments » endTime endTime floatrequiredstep: 0.01: End time in seconds for the segment. Must be greater than startTime.

settings » segments » audio audio stringrequired: Audio source URL for this segment.

settings » segments » audioStartTime audioStartTime floatmin: 0step: 0.01default: 0: Start time in seconds within the source audio file.

settings » segments » audioEndTime audioEndTime floatmin: 0step: 0.01: End time in seconds within the source audio file.

settings » syncMode syncMode stringdefault: cut_off

Synchronization strategy when audio and video durations don't match.

Allowed values4 values

: Audio bounces back and forth to fill video duration.
: Audio is cut when video ends.
: Remaining video plays with silence after audio ends.
: Audio is time-stretched or compressed to match video duration.

settings » tts tts object

Configuration for the text-to-speech provider used with speech input.

Properties3 properties

settings » tts » provider provider stringdefault: elevenlabs: Name of the TTS provider.

settings » tts » stability stability floatmin: 0max: 1: Voice stability for the TTS provider. Higher values produce more consistent output.

settings » tts » similarityBoost similarityBoost floatmin: 0max: 1: Voice similarity enforcement for the TTS provider. Higher values make the voice more closely match the target.