kwaivgi/kling-video/v2.1/pro/image-to-video
Kling Video V2.1 Pro is KwaiVGI's image-to-video AI model. Bring static images to life with fluid animation, consistent character motion, and professional-grade video output.
PNG, JPEG, WebP, or GIF · 20 MiB maximum
PNG, JPEG, WebP, or GIF · 20 MiB maximum
Example output — click Run to generate your own
Send your first request
OpenAI-compatible endpoint with unified authentication and usage tracking.
https://api.sandbase.ai/v1/runkwaivgi/kling-video/v2.1/pro/image-to-videoInput Schema
4 parameters · 2 required · 2 optional
| Parameter | Type | Required | Description |
|---|---|---|---|
image | string | Required | URL of the image to be used for the video |
prompt | string | Required | Max length: 2500 |
duration | integer | Optional | The duration of the generated video in seconds · Options: 5, 10 · Default: 5 510 |
end_image | string | Optional | URL of the image to be used for the end of the video |
Output Schema
| Field | Type | Description |
|---|---|---|
id | string | Unique identifier for the generation task |
status | string | Task status: pending, running, completed, failed, timeout |
model | string | Model used for the generation |
outputs | array | Array of output items |
outputs[].url | string | URL of the generated artifact |
outputs[].content_type | string | MIME type (e.g. image/png, video/mp4) |
error | object | null | Error details if failed, null on success |
error.type | string | Machine-readable error type code |
error.message | string | Human-readable error description |
Async Workflow
This model uses asynchronous execution. Submit a request and poll for the result.
- Submit — POST to /v1/run, receive an
id - Poll — GET /v1/run/{id} until status is
completed,failed, ortimeout - Retrieve — Read
outputsfrom the completed response
Code Examples
Ready-to-run snippets
# Step 1: Submit
curl -X POST https://api.sandbase.ai/v1/run \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "kwaivgi/kling-video/v2.1/pro/image-to-video",
"image": "https://v3.fal.media/files/lion/_I_io6Gtk83c72d-afXf8_image.webp",
"prompt": "Warm, incandescent streetlights paint the rain-slicked cobblestones in pools of amber light as a couple walks hand-in-hand, their silhouettes stark against the blurry backdrop of a city shrouded in a gentle downpour; the camera lingers on the subtle textures of their rain-soaked coats and the glistening reflections dancing on the wet pavement, creating a sense of intimate vulnerability and shared quietude.",
"duration": 5
}'
# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
-H "Authorization: Bearer YOUR_API_KEY"API README
Kling Video V2.1 Pro
image to video in the Kling Video lineup is built to animate a supplied still while treating it as the visual anchor. The kling video v2.1 pro image to video configuration combines that transformation with the quality and motion profile represented by this exact model version, so teams can choose it deliberately among adjacent family variants. It is useful when the input already establishes part of the creative intent and the model must supply a polished result rather than a generic media conversion, with subject identity, scene logic, visual hierarchy, and the delivery goal kept explicit.
For production work with kwaivgi/kling-video/v2.1/pro/image-to-video, begin with the non-negotiable content, then describe the desired change, framing, action, atmosphere, and finishing cues in that order. Separate what must remain recognizable from what may vary, and prefer concrete nouns and observable actions over abstract praise. That structure makes outputs easier to compare across storyboard passes, campaign variants, catalog assets, and other repeatable creative pipelines.
Highlights
Source-frame fidelity. Treats the supplied image as the identity and composition anchor.
Natural still-image animation. Adds subject, environmental, and secondary motion grounded in the source.
Directed camera movement. Supports push-ins, tracking, orbiting, and restrained static-camera motion.
kling video v2.1 pro image to video coherent temporal development. Carries faces, objects, lighting, and geometry through the sequence. This is the defining creative strength of the kling video v2.1 pro image to video configuration.
Pricing
| Duration | Price per generated clip |
|---|---|
| 5 seconds | $0.4900 |
| 10 seconds | $0.9800 |
Billing follows params.duration * 0.098: multiply generated seconds by the $0.0980 per-second rate.
When to Use
| ✅ Good fit | ❌ Consider alternatives |
|---|---|
| A still image should anchor the video's subject and composition | The whole scene should be invented from text alone |
| A managed asynchronous result is suitable for the production pipeline | A synchronous, interactive editor is essential |
| The documented controls cover the required duration, framing, or format | The project needs controls outside this endpoint's schema |
| Creative iteration benefits from a repeatable request structure | Exact deterministic pixels, frames, geometry, or samples are mandatory |
| A finished downloadable media asset is the desired deliverable | Editable source layers or a native project file are required |
Prompt Guide
For image-conditioned generation, state the intended result first, then add the subject or source treatment, progression, style, and delivery constraints. Keep one creative variable per phrase, use the documented field names for controls, and change one setting at a time when comparing results.
{
"duration": 5,
"image": "https://v3.fal.media/files/lion/_I_io6Gtk83c72d-afXf8_image.webp",
"prompt": "Warm, incandescent streetlights paint the rain-slicked cobblestones in pools of amber light as a couple walks hand-in-hand, their silhouettes stark against the blurry backdrop of a city shrouded in a gentle downpour; the camera lingers on the subtle textures of their rain-soaked coats and the glistening reflections dancing on the wet pavement, creating a sense of intimate vulnerability and shared quietude."
}
Technical Specs
| Spec | Value |
|---|---|
| Model ID | kwaivgi/kling-video/v2.1/pro/image-to-video |
| Inputs | duration, end_image, image, prompt |
| Required inputs | prompt, image |
| Output fields | content_type, url |
| Execution | Async (submit, then poll for result) |
| Duration | 5 / 10 |