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Black Forest Labs
Flux.2 Image Models
black-forest-labs/flux-3/first-last-frame-to-video
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BLACKFORESTLABS FLUX 3 First & Last Frame to Video
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BLACKFORESTLABS FLUX 3 First & Last Frame-to-Video API by Black Forest Labs

black-forest-labs/flux-3/first-last-frame-to-video
First-last-frame-to-video

Generate a video between a start frame and an end frame using FLUX 3.

BLACKFORESTLABS FLUX 3 First & Last Frame-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 First & Last Frame to Video

FLUX 3 First & Last Frame to Video generates a smooth video transition between two images. Provide a start frame and an end frame, add a prompt describing the motion in between, and the model fills in a cinematic clip that begins and ends exactly on your images — with optional native audio.

Why Choose This?

  • Precise start and end control Pin both the opening and closing frames for exact transitions.

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

  • Explicit duration required Duration must be set explicitly so the model knows where to place the end frame.

  • 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
start_image_urlYesURL of the image used as the first frame (PNG, JPEG, or WebP)
end_image_urlYesURL of the image used as the last frame (PNG, JPEG, or WebP)
promptNoText description of the motion between the two frames
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 — an explicit value is required to place the end frame
generate_audioNoWhether to generate audio. Default: true
safety_toleranceNoSafety level 0 (strictest) to 4 (most permissive). Default: 2
seedNoRandom seed for reproducibility

How to Use

  1. Provide your start image — the video opens on this frame.
  2. Provide your end image — the video closes on this frame.
  3. Write your prompt — describe the motion, action, and camera movement between the two frames.
  4. Set duration explicitly — pick a value from 5–20 seconds (auto is not supported here).
  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

  • Scene Transitions — Morph smoothly from one scene to another.
  • Before & After — Animate a transformation between two states.
  • Storytelling — Bridge two key moments in a visual narrative.
  • Product Demos — Show a product moving from one configuration to another.

Pro Tips

  • Keep the two images' aspect ratios similar for the cleanest interpolation.
  • Describe what happens between the frames in the prompt, not what's in them.
  • Use longer durations for complex transitions; shorter for snappy cuts.
  • Describe ambient sounds for richer audio output when generate_audio: true.

Notes

  • Both start_image_url and end_image_url are required.
  • duration cannot be "auto" — the model needs an explicit frame count to anchor the end image.
  • Accepted image formats: PNG, JPEG, WebP.
  • Generation is asynchronous — submit, then poll for the finished video.

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