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Seedance 2 First & Last Frame Fast: Image-to-Video

SD 2 First & Last Frame (Fast) by ByteDance. Quickly generate video that transitions between reference images at reduced cost. Provide 1 or 2 images. SD 2 First & Last Frame (Fast) quickly generates video that transitions between reference images at lower cost. Provide one or two images to anchor the opening and closing frames, with 4–15 second duration.

Interactive model controls

SD 2 First & Last Frame (Fast) by ByteDance. Quickly generate video that transitions between reference images at reduced cost. Provide 1 or 2 images.

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Overview

About this model

SD 2 First & Last Frame (Fast) quickly generates video that transitions between reference images at lower cost. Provide one or two images to anchor the opening and closing frames, with 4–15 second duration.

1Quick Transitions: Rapidly preview frame-to-frame transitions before committing to Pro quality.
2High Volume: Generate many first-last-frame videos at scale.
3Concept Testing: Test visual transitions inexpensively.
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Pricing & Value

Cost analysis

muapiapp$0.15 per second (e.g. $0.75 for 5 seconds)

Pay per second of video generated.

Fal.ai$0.3024/sec (high) / $0.2419/sec (basic)

Fal.ai charges $0.3024/sec for high quality and $0.2419/sec for basic. muapiapp Fast at $0.15/sec is 50% cheaper than Fal.ai's basic rate.

Replicate$0.3024/sec (high) / $0.2419/sec (basic)

Replicate charges the same as Fal.ai — $0.3024/sec (high), $0.2419/sec (basic). muapiapp Fast at $0.15/sec is 50% cheaper than Replicate's basic rate.

** Competitor pricing is estimated based on similar model architectures and usage tiers.

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Technical Details

Configuration schema

Promptstring

Text description guiding the transition between frames.

Default ValueTwo people having a street interview, the interviewer holds a microphone.
Frame Imagesarray

1 image = first frame only; 2 images = first and last frame. Use 'adaptive' aspect ratio to match the reference image geometry.

Default Valuehttps://d3adwkbyhxyrtq.cloudfront.net/ai-images/186/712345784292/4a8c5c70-abcc-4920-873e-b0e219986453.jpg
Aspect RatioEnum (7 options)

Output video aspect ratio. 'adaptive' matches the reference image (recommended); concrete ratios may crop or pad.

Default Valueadaptive
Duration (seconds)int

Video duration in seconds.

Default Value5
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Implementation Guide

Developer documentation

How to Use SD 2 First & Last Frame (Fast)

  1. Upload 1 or 2 images: Provide images via images_list. First image = opening frame, second image (optional) = closing frame.

  2. Write your prompt: Describe the transition or motion between frames.

  3. Set duration: Between 4 and 15 seconds.

  4. Submit and poll: Use the returned request_id to poll for results.

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Common Questions

Frequently asked

Do I need two images?

No. One image anchors just the first frame. Two images constrain both the start and end of the video.

How does Fast compare to Pro?

The Fast model is quicker and cheaper with a slight reduction in output quality compared to the Pro variant.

What image formats are supported?

JPEG, PNG, WebP, and BMP are supported.