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Black Forest Labs
Flux.2 Image Models
black-forest-labs/flux-3/keyframes-to-video
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BLACKFORESTLABS FLUX 3 Keyframes to Video
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BLACKFORESTLABS FLUX 3 Keyframes-to-Video API by Black Forest Labs

black-forest-labs/flux-3/keyframes-to-video
Keyframes-to-video

Generate a video that hits the supplied keyframe images at exact frame positions using FLUX 3.

BLACKFORESTLABS FLUX 3 Keyframes-to-Video は Black Forest Labs が開発したモデルです。Atlas Cloud(運営:Atlas Cloud AI LLC)は本モデルへのアクセスを提供するものであり、その所有者ではありません。すべての商標は各所有者に帰属します。

FLUX 3 Keyframes to Video

FLUX 3 Keyframes to Video generates a video that hits your supplied images at exact frame positions. Provide up to 10 keyframe images each pinned to a specific frame index, add a prompt describing the overall motion, and the model interpolates a cinematic clip that passes through every keyframe precisely — with optional native audio.

Why Choose This?

  • Frame-accurate image placement Pin up to 10 images to any frame position in the output video (24 fps).

  • Full creative control Combine multiple visual anchors with a single guiding prompt.

  • Native audio generation Produce video and synchronized audio in a single request.

  • Explicit duration required Duration must be set explicitly to validate keyframe positions.

  • Flexible aspect ratios auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, or 9:16.

  • High resolution output Generate videos in 720p or 1080p.

Parameters

ParameterRequiredDescription
keyframesYesArray of keyframe objects (up to 10). Each must have a unique frame_index. See schema below
promptNoText description of the overall motion and scene
aspect_ratioNoAspect ratio of the generated video. Default: auto. Options: auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16
resolutionNoVideo resolution. Default: 720p. Options: 720p, 1080p
durationNoDuration in seconds. Default: 5. Options: 5–20. Cannot be auto — required to validate keyframe positions
generate_audioNoWhether to generate audio. Default: true
safety_toleranceNoSafety level 0 (strictest) to 4 (most permissive). Default: 2
seedNoRandom seed for reproducibility

Keyframe Object

FieldRequiredDescription
image_urlYesURL of the keyframe image (PNG, JPEG, or WebP)
frame_indexYesFrame position in the video. At 24 fps, max value is duration × 24. Must be unique across all keyframes

Frame Index Reference (24 fps)

DurationMax frame_indexCommon anchor points
5s1200 (start), 60 (mid), 120 (end)
10s2400, 120, 240
20s4800, 240, 480

How to Use

  1. Decide your keyframes — choose which images to anchor and at which timestamps.
  2. Convert timestamps to frame indices — multiply seconds by 24 (e.g. 2.5s → frame 60).
  3. Write your prompt — describe the overall motion and scene across the full clip.
  4. Set duration explicitly — pick a value from 5–20 seconds.
  5. Choose resolution and aspect ratio.
  6. Run — submit and download your video.

Pricing

Billed per second of generated video, by resolution:

ResolutionCost per second
1080p$0.319
720p$0.187

Best Use Cases

  • Multi-scene Stories — String together multiple shots with consistent visual anchors.
  • Choreographed Motion — Sync visual beats to specific moments in the clip.
  • Complex Transitions — Chain more than two images with fine temporal control.
  • Storyboarding — Animate a sequence of storyboard panels into a full clip.

Pro Tips

  • Always pin frame_index: 0 to the first keyframe for a clean opening.
  • Keep all frame_index values unique — duplicates are rejected.
  • frame_index cannot exceed duration × 24 — validate before submitting.
  • Keep keyframe images visually coherent in style and lighting for smoother interpolation.

Notes

  • keyframes is the only required field (minimum 1 keyframe).
  • Up to 10 keyframes per request; each frame_index must be unique.
  • duration cannot be "auto" — an explicit value is needed to validate frame positions.
  • Video is generated at 24 fps.
  • Generation is asynchronous — submit, then poll for the finished video.

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