Video-to-video restyling
2 Fast transforms existing footage (style, season, grade, era) while preserving the source motion, which text-only models cannot do.
Seedance 2 Fast AI Video Generator
Seedance 2 Fast is an AI video generation model developed by ByteDance. Use Seedance 2 Fast as a quick AI video generator with video-to-video and audio input. Learn its flexible durations, fast loop, prompting, examples, and limits before generating. The sections below break down its capabilities, live settings, prompting, examples, and review points.
MODEL OVERVIEW
What is Seedance 2 Fast?
2 Fast trades peak finishing for velocity and input flexibility: restyle existing footage and iterate daily.
Try Seedance 2 FastModel focus
2 Fast serves velocity calendars: any duration from 4 to 15 seconds with video and audio inputs accepted.
Input workflow
Text, image, and video-to-video modes plus audio input cover restyles, continuations, and synced pieces with up to 9 references.
Output control
Use the live settings table as truth for the full duration ladder, 480p/720p resolutions, and generation-type options.
CORE CAPABILITIES
Seedance 2 Fast capabilities
Why creators pick 2 Fast for volume and restyling.
Audio input
Feed music or voiceover so cuts, moves, and reveals land on real cues instead of guessed timing.
Second-level durations
Every integer from 4 to 15 seconds is selectable, so each placement gets its exact length without trimming waste.
Nine-reference direction
Character, style, and scene inputs steer fast iterations without rebuilding direction from scratch each round.
LIVE SETTINGS
Seedance 2 Fast supported settings
These values come from the currently configured 2 Fast route, so this table stays aligned with what the generator can actually submit.
- Aspect Ratio
- 16:9 · 4:3 · 1:1 · 3:4 · 9:16 · 21:9
- Resolution
- 480p · 720p
- Duration
- 4s · 5s · 6s · 7s · 8s · 9s · 10s · 11s · 12s · 13s · 14s · 15s
- Reference Image
- 9
- Sound
- ✓
- Reference Audio
- ✓
- Reference Video URL
- ✓
HOW TO USE IT
How to use Seedance 2 Fast
A velocity loop for restyles and dailies.
Bring source or brief
Upload footage to restyle or write a short brief for fresh generation with audio cues.
Set exact duration
Pick the precise second count the placement needs, from 4 to 15.
Direct the transform
State what changes (style, era, grade) and what must survive (motion, identity, timing).
Review against source
Compare motion fidelity and sync with the input before publishing the restyle.
BEST USE CASES
Where Seedance 2 Fast works best
Pick 2 Fast when footage exists or calendars are tight.
Footage restyles
2 Fast regrades day to night, summer to snow, or live to anime while keeping the original camera work intact.
Daily volume
A full short per day stays feasible when iteration is fast and durations match placements exactly.
Synced pieces
Lyric videos, beat-cut edits, and dialogue-timed gags benefit from genuine audio input.
Format families
One concept ships in every duration from 4 to 15 seconds for hooks, standards, and extended cuts.
PROMPT GUIDE
How to prompt Seedance 2 Fast
Transform-language briefs with explicit survivors.
Try Seedance 2 FastDescribe the delta
Say what the output should become relative to the input, not the scene from scratch.
Name the survivors
List motion, identity, and timing elements that must pass through unchanged.
Cue the audio
Mark drops and lines so the transform respects the track's structure.
PROMPT EXAMPLES
Seedance 2 Fast prompt examples
Starting points for restyles and dailies.
- 01
Restyle this daytime street footage as rainy neon night, keep camera motion and pedestrians, 8 seconds.
- 02
Turn this product spin into floating zero-gravity showcase synced to the bass drop, 6 seconds vertical.
- 03
Continue this skate clip with the same rider landing the trick at sunset, matching speed, 10 seconds.
WHAT TO REVIEW
Seedance 2 Fast limitations and review points
Fast and flexible, capped at 720p without flagship controls.
Maximum 720p: full-HD hero finishes belong on Seedance 2 or 2.5, not on the Fast tier.
No first/last-frame bracketing; precise start-end resolves need 2.5's frame control.
Heavy restyles can drift identity and fine text; verify faces, logos, and lettering against the source.
FAQ