Video GenerationActive
Kling V4 Flash Reference-to-Video
byklingai
Generate 5–20s 720p videos guided by reference images and clips. Keep characters and style consistent with up to 10 images and 5 videos.
Overview
Kling V4 Flash Reference by Kling AI generates short 720p videos from a written prompt plus optional references. You can feed it reference images for identity and style, plus reference videos for motion and camera pacing. It can also start from a chosen first frame or edit a base clip when you ask for an edit. This workflow helps you keep characters and products consistent across many fast iterations.
What you can build
- Character-consistent short scenes for social media
- Product demos that keep logos, colors, and materials stable
- New shots that borrow camera movement from a reference clip
- Style-guided videos that match a mood board
- Quick ad variations that reuse the same references
- Light video edits where you keep most of a clip unchanged
Inputs
- A required prompt that describes the action over time, the setting, and the camera.
- Optional reference images for characters, objects, scenes, or style, up to 10 total images.
- An optional first-frame image that can lock the opening frame and counts toward the image limit.
- Optional reference videos for motion, camera movement, or pacing.
- Send MP4 or MOV.
- Each clip must be 3–20 seconds.
- Each clip should be at least 700 px on both sides.
- You can include up to 5 clips and up to 20 seconds total video input.
- An optional base video to edit.
- Send MP4 or MOV.
- The clip must be 3–20 seconds and at least 700 px per side.
- In the prompt, explicitly request an edit and name the video token.
- A duration choice for the generated result, from 5 to 20 seconds.
- An aspect ratio choice.
- You can pick a fixed ratio like 16:9, 9:16, 1:1, or 21:9.
- You can also let the model adapt the ratio based on your inputs.
- An audio choice.
- You can generate new audio with the video.
- Or you can keep original audio from an input video when you provide one.
- An option to add a visible watermark to the output.
Outputs
The model returns a single MP4 video file at 720p resolution. The clip matches your requested duration and aspect ratio selection. When audio is enabled, the MP4 includes an audio track generated with the visuals. When you choose to preserve original sound, the output keeps audio from the provided input video source.
Limitations
- Output resolution is limited to 720p in Flash mode.
- Maximum output length is 20 seconds per generation.
- You can reference up to 10 images in total, including any first frame.
- You can reference up to 5 videos, with 20 seconds total across all video inputs.
- Reference videos and base videos must be 3–20 seconds and at least 700 px per side.
- References guide the result, but they aren’t guaranteed to stay perfectly identical.
- Heavy compression, motion blur, or low-light footage weakens motion and identity guidance.
- Low-quality stills, tiny subjects, or cluttered collages can cause drifting details.
Safety & compliance
- Follow Kling AI’s Community Policy for prohibited content and conduct.
- Don’t generate illegal content, violence promotion, or election interference content.
- Don’t remove, alter, or conceal AI-generated content labels where required.
- Only upload media you own or have permission to use.
- Kling AI’s API terms state prompts and outputs aren’t used to train their models.
- Kling AI may retain prompts and outputs for up to 30 days for moderation and compliance.
Example prompts
Great starting points for kling v4 flash reference.
The macaw from @image_1 spreads its bright red, blue and yellow wings, takes off from the mossy branch and flies through the lush green rainforest, then lands on another branch and ruffles its feathers. Soft light through the leaves, the camera follows its flight. Wing flaps, birdsong and jungle ambience.Video Generation
A hand unscrews the lid of the glowing glass jar of fireflies from @image_1 on the porch railing at dusk, and the fireflies drift out one by one, floating up and spreading over the dark meadow like tiny lights. Slow push-in, blue evening light. Crickets and a soft summer night breeze.Video Generation
The knight from @image_1 walks slowly through the misty pine forest, armor clinking, then stops in a beam of light, grips the hilt and slowly draws his sword, the blade catching the light. Cinematic low angle, drifting mist. Metal footsteps, the ring of the drawn sword and quiet forest sounds.Video Generation
The hiker from @image_1 climbs the last rocks to the mountain summit at sunrise, steps onto the top and raises both arms above a sea of clouds, smiling in the golden light. The camera rises behind her to reveal the view. Wind and a happy shout.Video Generation
API quick start
Run kling v4 flash reference with a single API call.
{
"prompt": "The macaw from @image_1 spreads its brigh…",
"duration": 3,
"inputImage": "https://your-cdn.com/input.png",
"inputImageReference": "https://your-cdn.com/input.png"
}curl -X POST "https://api.wiro.ai/v1/Run/klingai/kling-v4-flash-reference" \
-H "Content-Type: application/json" \
-H "x-api-key: YOUR_WIRO_API_KEY" \
--data-binary @- <<'JSON'
{
"prompt": "The macaw from @image_1 spreads its brigh…",
"duration": 3,
"inputImage": "https://your-cdn.com/input.png",
"inputImageReference": "https://your-cdn.com/input.png"
}
JSON