minimax-h3-open/image-to-video
Open-weights image-to-video with optional last frame and native stereo audio.
Seedance 2.5 First & Last Frame 480p builds a believable transition between two keyframes at 480p. Provide a first frame and a last frame plus a prompt that describes how the shot should move between them; Seedance 2.5 generates the in-between motion with optional synchronized native audio. The output aspect ratio follows your input frames.
| Advantage | What it means for you |
|---|---|
| Keyframe-controlled motion | Both endpoint looks stay intact while the model fills the motion between them. |
| Native audio in one pass | Generate synchronized speech, effects, and music with the clip, or turn audio off for silent video. |
| Up to 30-second clips | Bridge two frames over a longer, steadier shot. |
| Ratio follows your frames | Output keeps the framing of your input images — no separate aspect-ratio setting to manage. |
The table below lists the controls exposed by the Seedance 2.5 First & Last Frame 480p tool on this page.
| Parameter | Required | Type | Default | Range / Options | How to choose |
|---|---|---|---|---|---|
prompt* | Yes (*) | String | Example prompt | Chinese ~≤500 characters or English ~≤1000 words recommended | Describe how the shot should move between the two frames, plus any audio. |
first_frame* | Yes (*) | String (image URL) | Example image | jpeg, png, webp, bmp, tiff, gif | The opening frame; sets the starting look and output aspect ratio. |
last_frame* | Yes (*) | String (image URL) | Example image | jpeg, png, webp, bmp, tiff, gif | The closing frame; sets the ending look. |
duration | No | Integer | 5 | 4–30 seconds, in 1-second steps | Longer durations give the transition more room; keep it tight for quick bridges. |
generate_audio | No | Boolean | true | true / false | Leave on for synchronized speech, effects, and music; turn off for silent video. |
\* Required field. This page has no aspect-ratio control (the output ratio follows the input frames) and no other reference inputs.
Seedance 2.5 First & Last Frame 480p is billed per second of generated video at a fixed 480p:
| Duration | Price at $0.17/s |
|---|---|
| 5s | $0.85 |
| 10s | $1.70 |
| 15s | $2.55 |
| 30s | $5.10 |
For batches of multiple outputs, calculate the total as duration × $0.17 × output count.
Improved prompt example
> Smooth cinematic transition from an overcast empty coastal highway to the same overlook at golden hour with a dark blue station wagon driving past, natural cloud and light change, gentle push-in, continuous motion, photorealistic, no text, no watermark.
Open-weights image-to-video with optional last frame and native stereo audio.
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It builds a 480p transition between a first frame and a last frame. It fits scene-to-scene bridges, product pack-to-use reveals, and before-to-after story beats.
It requires a prompt plus exactly two images (a first frame and a last frame). Duration is a whole number of seconds from 4 to 30 (default 5), and output is fixed at 480p. There is no aspect-ratio control — the output aspect ratio follows your input frames.
No. The output ratio follows your input frames, and the page takes only the two frames. Its API accepts only prompt, first_frame, last_frame, duration, and generate_audio. For multi-reference control, use the Seedance 2.5 reference-to-video page.
Yes. generate_audio is on by default, so the model can output synchronized speech, effects, and music. Turn it off when you only need silent video.
Both share the same first/last-frame path and 4–30-second window; this page outputs at 480p. Draft here, then reuse the same frames on the 720p page for finals.
Yes. Prototype in the RunComfy model UI, then call the same template through the API with matching fields (prompt, first_frame, last_frame, duration, generate_audio). Generations consume credits on both paths.
It is billed at $0.17 per second of generated video. Longer durations scale linearly with the length you select.
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