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LTX-2 19B

POST/v1/run

Ltx 2 19b Extend Video Lora is Lightricks's video-to-video AI model. Transform, enhance, and edit video content using text prompts - from style changes to object manipulation and scene modification.

Request body

Submit an async generation request. The model field selects the model; other fields are model-specific input parameters.

stringmodelrequired

Model identifier. Set to lightricks/ltx-2-19b/extend-video/lora.

Default: lightricks/ltx-2-19b/extend-video/lora

stringpromptrequired

The prompt to generate the video from.

Optional<string>end_image

The URL of the image to use as the end of the extended video.

Optional<string>video

The URL of the video to extend.

Optional<boolean>generate_audio

Whether to generate audio for the video.

Default: true

Optional<integer>seed

The seed for the random number generator.

Optional<string>extend_direction

Direction to extend the video. 'forward' extends from the end of the video, 'backward' extends from the beginning.

Allowed values: forward, backward

Default: forward

Optional<number>video_strength

Video conditioning strength. Lower values represent more freedom given to the model to change the video content.

Range: 0 to 1

Default: 1

Optional<number>audio_strength

Audio conditioning strength. Lower values represent more freedom given to the model to change the audio content.

Range: 0 to 1

Default: 1

Optional<number>end_image_strength

The strength of the end image to use for the video generation.

Range: 0 to 1

Default: 1

Optional<integer>num_inference_steps

Number of denoising or inference steps to run when supported.

Range: 8 to 50

Default: 40

Optional<number>guidance_scale

Request parameter supported by this model.

Range: 1 to 10

Default: 3

Optional<array>loras

LoRA adapters applied to the generation. At most three items are accepted.

Response Schema

The submit endpoint returns a run response. If its status is pending or running, poll GET /v1/run/{id} with the returned opaque ID until it reaches a terminal state.

stringidrequired

Opaque SandBase run identifier. Use it exactly as returned; no prefix is guaranteed.

stringstatusrequired

Current public run status.

Allowed values: pending, running, completed, failed, timeout

Optional<string>model

Public SandBase model name used for this run.

Optional<array<object>>outputs

Present only for completed runs. Each object is capability-specific; inspect the selected model schema for its fields.

Optional<object>error

Present only for failed or timeout runs. Contains a public error type and sanitized message.

Optional<string>error.type

Stable public error category.

Optional<string>error.message

Sanitized error message safe to show to clients.

Optional<object>usage

Usage details when available.

Model capabilities

array<string>capability_tagsrequired

Capabilities declared by the model registry.

Default: video-to-video

stringexecution_moderequired

Execution mode declared by the model registry.

Default: async