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Seedance 2.5 FLF2V 480p: Keyframe Transitions on Models and API | RunComfy

bytedance/seedance-2.5/first-last-frame/480p

Seedance 2.5 FLF2V 480p turns a first and last still into a 480p image-to-video transition for faster, lower-cost drafts before a 720p finish.

Text prompt describing the transition and motion.
Starting keyframe image for the video transition.
Ending keyframe image for the video transition.
The duration of the generated video in seconds. Default is 5. Range is 4–30.
Aspect ratio of the output video.
Random seed for reproducible generation. Use -1 for random.
Idle
The rate is $0.33 per second, based on the generated video duration.

Introduction To Seedance 2.5 FLF2V 480p

ByteDance's Seedance 2.5 FLF2V 480p bridges a start frame and an end frame into a 480p transition clip for quick keyframe trials before a higher-resolution pass. Trading costly full-res reruns for cheaper draft morphs while keeping Seedance 2.5 motion continuity, it helps editors, previz artists, and social teams lock a transition idea without burning budget. For developers, Seedance 2.5 FLF2V 480p on RunComfy can be used both in the browser and via an HTTP API, so you don't need to host or scale the model yourself.
Ideal for: Keyframe Transition Drafts | Shot Bridge Previews | Low-Cost Morph Tests

ByteDance / Seedance 2.5 FLF2V 480p#


This page covers the 480p first-and-last-frame endpoint in the Seedance 2.5 family. You provide a start image and an end image, then describe the transition; the model returns a short video at 480p so you can validate keyframe bridges without paying full 720p rates.


The endpoint is built for the early loop of creative work: transition prompt tuning, timing checks, and batch draft runs. When a take looks right, move the same frames and prompt to the 720p sibling for delivery.

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Frequently Asked Questions

What is Seedance 2.5 FLF2V 480p best used for?

Seedance 2.5 FLF2V 480p is a ByteDance image-to-video endpoint that builds a 480p transition between a first frame and a last frame. It fits keyframe bridge trials, timing checks, and draft morphs where speed and cost matter more than final sharpness.

How does Seedance 2.5 FLF2V 480p differ from the 720p first-and-last-frame model?

Both share the same first/last-frame path and duration window; Seedance 2.5 FLF2V 480p outputs at 480p for cheaper, faster iteration, while the 720p sibling is better for polished deliverables. Draft here, then reuse the same frames at 720p.

What inputs and duration does Seedance 2.5 FLF2V 480p require?

Seedance 2.5 FLF2V 480p requires a prompt plus exactly two images (first frame and last frame). Duration spans 4 to 30 seconds (default 5), with aspect ratios 16:9, 9:16, 1:1, 4:3, 3:4, 21:9, and 9:21.

How can I keep results consistent when iterating with Seedance 2.5 FLF2V 480p?

Set an explicit seed on Seedance 2.5 FLF2V 480p while you change only the prompt or one frame. Holding duration and aspect ratio fixed also makes A/B tests easier to compare.

Can developers call Seedance 2.5 FLF2V 480p through the RunComfy API after trying it in the UI?

Yes. Prototype in the RunComfy model UI, then call the same Seedance 2.5 FLF2V 480p template through the RunComfy API with matching parameters. Generations consume usd / credits on both paths.

How much does Seedance 2.5 FLF2V 480p cost on RunComfy?

Seedance 2.5 FLF2V 480p is billed at $0.33 per second of generated video. Longer durations scale linearly with the length you select.

When should I stay on Seedance 2.5 FLF2V 480p versus moving to 720p?

Stay on Seedance 2.5 FLF2V 480p for transition drafts and batch variants. Move to the 720p Seedance 2.5 first-and-last-frame model when you need sharper finals for delivery.

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Examples Of Seedance 2.5 FLF2V 480p

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