Skip to main content

Seedance 2.5 Flash Prompting Guide

Seedance 2.5 Flash.
Fast video with sound, from 2 credits a second.

Make video with sound on Seedance 2.5 Flash, ByteDance’s faster, lower-cost Seedance 2.5. Learn the one-line formula, then copy the prompts behind real clips.

Pricing

Overview

Seedance 2.5 Flash is ByteDance’s faster, lower-cost version of Seedance 2.5. It makes video with sound from a prompt, a start frame or your own reference pictures, clips and audio.

It uses the same prompt language as Seedance 2.5. Everything you learn here works on both.

  • Text to video, a start frame, or start and end frames.
  • References tagged in the prompt as @Image1, @Video1 and @Audio1.
  • Spoken lines and sound, made with the picture.
  • 4 to 30 seconds, or Auto length, at 480p or 720p.
  • 16:9, 4:3, 1:1, 3:4, 9:16 and 21:9.
  • Priced at 2 credits per second at 480p and 4 at 720p.

Every clip on this page was made on Seedance 2.5 Flash. The prompt sits under each one, so you can copy it.

The prompt formula

Every example below follows one pattern. Write the shot first, then the subject and one action, then the place, the light and the lens. End with what the clip should sound like.

Formula
[shot size + camera move]. [specific subject] [one action beat], [environment], [light], [lens or film texture]. Sound: [what is heard], no music.
  • Shot size and camera move: "Medium close-up with a slow push in", "Aerial drone shot sweeping fast and low".
  • Subject: say who or what it is, with two or three details you can see.
  • One action beat: one clear thing happens in a 5 second clip.
  • Light and lens: "soft gray window light, 50mm lens" gives the clip a look.
  • Sound: name what is heard. Add "no music" if you want only real sounds.

For the full reference on references, stages and editing, read the Seedance 2.5 Prompting Guide. The same language works on Flash.

People and spoken lines

Put the line in quotes or braces. Say who speaks, how, and in which language. Then say what the room sounds like.

A line of dialogue by a cafe window

Seedance 2.5 Flash, 720p, 5 s

Spoken line in braces, light and room sound named.

Prompt
Medium close-up with a slow push in. A woman in her late twenties with long dark wavy hair and a cream knit sweater sits by a rain-streaked cafe window, wraps both hands around a steaming cup, looks into the lens with a warm smile and says softly in American English: {I almost didn't come. I'm glad I did.} Soft gray window light on her face, warm amber bokeh behind her, 50mm lens, shallow depth of field. Sound: rain on glass, quiet cafe murmur, no music.

The same recipe works for a face to camera, an interview or a product pitch.

A punch in slow motion

Seedance 2.5 Flash, 720p, 5 s

One action beat, one hard light, the sounds of the hit.

Prompt
Low angle slow-motion shot. A woman boxer in her twenties with tight braids and a black sports top throws a hard right cross into a heavy bag, chalk dust bursting off her glove and sweat flying from her brow, a single hard spotlight cutting through haze in a dark gym, 35mm lens, crisp high contrast. Sound: the thud of the punch, a sharp exhale, chains rattling, no music.

A dancer on a rooftop

Seedance 2.5 Flash, 720p, 5 s

A circling camera, a full-body frame, golden hour light.

Prompt
Full-body shot with the camera slowly circling. A man in his thirties with a short fade and an emerald velvet suit dances with sharp, fluid footwork on a city rooftop at golden hour, his open jacket swinging with each spin, skyline glowing behind him, 24mm lens, warm cinematic color. Sound: his shoes scuffing concrete, city hum below, a light breeze, no music.

Product shots

A macro lens and one light sweep give product clips a clean, high-end feel. Name the material you want to see, like frosted glass or rose gold.

A product rising from liquid

Seedance 2.5 Flash, 720p, 5 s

Macro lens, one light sweep, a soft liquid sound.

Prompt
Macro slow-motion commercial shot. An unlabeled frosted glass serum bottle with a rose gold cap rises out of rippling milk-white liquid, droplets streaming down its sides and a ring of ripples spreading outward, soft pink backlight and a clean light sweep across the glass, 100mm macro lens, glossy high-end look. Sound: a soft liquid swell and gentle drips, no music.

Styles and big scenes

Name the look first for an illustrated style. For a big scene, give the camera a clear path from where it starts to what it reveals.

Anime style on a canal

Seedance 2.5 Flash, 720p, 5 s

The look named first, then a moving camera and a warm palette.

Prompt
Hand-painted anime film look, tracking shot from the side. A woman courier in her twenties with a yellow raincoat and a short black bob pedals a bicycle along a canal in a floating market town, paper lanterns swaying and laundry fluttering overhead, her hair and coat whipping in the wind, warm sunset palette with soft cel shading. Sound: bicycle bell, water lapping, distant market chatter, no music.

A fast drone flight

Seedance 2.5 Flash, 720p, 5 s

A wide lens, a clear path from start to reveal, wind and water for sound.

Prompt
Aerial drone shot sweeping fast and low over emerald rice terraces at sunrise, skimming past palm trees and rising to reveal a tall waterfall pouring into a misty valley, long golden light rays cutting through the haze, 16mm wide lens, crisp high dynamic range color. Sound: rushing wind and the growing roar of the waterfall, no music.

Effects with a clear before and after

Seedance 2.5 Flash, 720p, 5 s

Say what the object is, how it breaks, and what comes out.

Prompt
Medium wide shot with a slow push in. A clear ice sculpture of a bird on a stone plinth in a dark hall cracks with glowing blue light, shatters outward in slow motion, and a living bird made of swirling frost and light spreads its wings and lifts off, shards hanging in a single cold spotlight, 35mm lens, rich contrast. Sound: ice cracking, a deep whoosh of wings, crystalline chimes, no music.

Vertical video

Choose 9:16 for Reels, TikTok and Shorts. Open the prompt with the word vertical and keep the subject in the middle of the frame.

Seedance 2.5 Flash, 720p, 9:16, 5 s

A handheld follow shot with a turn to camera.

Prompt
Vertical handheld follow shot. A woman in her twenties with honey blonde hair in a loose ponytail, a white linen shirt and gold hoop earrings walks through a sunlit flower market, turns back to the camera laughing and holds up a bunch of peonies, petals drifting past, warm morning light and soft lens flare, 28mm lens. Sound: market chatter, her laugh, paper wrapping rustling, no music.

Draft on Flash, finish on Seedance 2.5

Flash costs a third less and renders faster. That makes it a good place to try ideas.

  • Write your prompt and render it on Flash at 720p.
  • Change one thing at a time until the clip is right.
  • Render the keeper on Seedance 2.5 at 1080p with the same prompt.
Seedance 2.5 FlashSeedance 2.5
Price per second2 credits at 480p, 4 at 720p3 credits at 480p, 6 at 720p, 16 at 1080p
Resolutions480p, 720p480p, 720p, 1080p
Reference imagesUp to 10Up to 30
Reference videosUp to 5Up to 10
Audio tracksUp to 5Up to 10
Length4 to 30 seconds, or Auto4 to 30 seconds, or Auto

See the same six prompts on both models in Seedance 2.5 Flash vs Seedance 2.5.

Frames and references

Give Flash a start frame, or a start and an end frame, and the clip follows that picture. Or tag your own files in the prompt as @Image1, @Video1 and @Audio1.

  • Use a start frame when the first picture matters most.
  • Use references when you want the same person, product or voice across a clip.
  • Pick one or the other. Frames and references cannot be mixed in one request.
  • With a start frame or a reference video, the clip takes that input’s shape.

Where to use it

Seedance 2.5 Flash is on its own page. It is also a model choice in Video Studio, Film Studio, Marketing Studio, Kata and Canvas, and through the API and MCP.