Seedance 2.5 AI Video Generator
Direct up to 30 seconds of 480p/720p video with ByteDance Seedance 2.5 — second-by-second timestamp control, up to 50 image, video and audio references, and dialogue, sound effects and ambience generated in sync, all in one click on HeyMarmot.
Optional: mix up to 50 image, video and audio references, then map each one to a role in your prompt.
See Seedance 2.5 in motion
Real HeyMarmot creations: a directed prompt plus references become a consistent, sound-synced Seedance 2.5 shot.
Prompt
【第1秒】红衣剪影反手持剑，剑尖拖出一道细长朱红，在地面划出半圆，电影风格式起手。 【第2秒】蓝衣从天而降，双掌下压，墨色如瀑布倾泻，红影侧闪，残影留在原地被击碎成雾，抽帧处理，顿挫感。 【第3-5秒】极速对剑，每秒镜头切换。每一次兵器相交，红蓝墨迹都以式喷溅炸开，墨珠溅向画面四角，如血如火。 【第6秒】两人贴身相持，剑锋抵在一起，红蓝墨色在接触点缓缓交融、旋转，张力瞬间，时间被拉长。 【第7秒】突然爆发，两人向后弹开，墨迹从交融点被撕裂成两股，在空中画出两道纠缠的弧线。 【第8-10秒】快切：红影旋身，甩出一串朱红墨点如暗器；蓝影凌空翻滚，每一次旋转都甩出靛蓝墨环，套向对手。 【第11秒】红影剑锋直刺，剑尖穿透蓝影胸口——蓝影却化作一滩墨迹散开，真身已绕至背后虚实转换。 【第12-13秒】背身对决，两人同时向后出招，两股墨色在空中碰撞、缠绕，如太极图般旋转。 【第14秒】镜头拉远，两道剪影在最后一击中交错而过，静止。 【第15秒】红蓝墨迹在空中缓缓交融、晕染，最终定格成一幅泼墨大写意——两个身影背对而立，墨色未干，意犹未尽。使用水墨画的画面风格生成素材
Seedance 2.5 vs other top AI video models
Switch between Seedance 2.5, Seedance 2.0, Veo 3.1, Sora 2, Kling 3.0 and more in one workspace — pick the right engine for every shot.
A 30-second film, directed second by second
Seedance 2.5 reads timestamps at one-second resolution, so you can script every beat — action, camera move, line of dialogue and sound — and get a coherent long take instead of a lucky four-second clip.
Three steps to a Seedance 2.5 video
From prompt to final cut, Seedance 2.5 is just three steps away.
Describe & map references
Write your prompt, add images, video or audio, then say in the text which reference is which.
Pick Seedance 2.5 & settings
Select Seedance 2.5, then tune duration up to 30s, resolution and aspect ratio.
Generate and iterate
Preview the result, download, or refine the timeline and rerun in the same thread.
Seedance 2.5 and other supported video models
Toggle Seedance 2.5, Seedance 2.0, Veo 3.1, Kling 3.0 and more without leaving HeyMarmot — one workspace, no extra subscriptions.
Seedance 2.5
Supported in the HeyMarmot video workspace.
Seedance 2.0
Supported in the HeyMarmot video workspace.
Veo 3.1
Supported in the HeyMarmot video workspace.
Sora 2
Supported in the HeyMarmot video workspace.
Kling 3.0
Supported in the HeyMarmot video workspace.
Seedance 1.5 Pro
Supported in the HeyMarmot video workspace.
Wan AI
Supported in the HeyMarmot video workspace.
Seedance 2.5 video use cases
Turn scripts, photos and footage into finished motion content for storytelling, social, ecommerce and paid ads — with sound already in the cut.
Short films & narrative scenes
Script a full 30-second story with timestamped beats, multi-shot camera work and characters that stay consistent throughout.
Social & short-form video
Turn prompts, photos and clips into vertical Reels, TikTok and Shorts with native audio baked in.
Product & ad creatives
Animate product shots into push-ins, parallax and ambient motion, with clean ambient sound and no music bed when you need it.
Reference-driven remix & editing
Feed existing footage and audio as references, then edit, extend or restyle them with plain-language instructions.
A studio built for directing Seedance 2.5
HeyMarmot unifies reference assets, timeline prompting, model controls and history so iterating on a long take stays fluid.
Multimodal prompting
Combine text with up to 50 images, videos and audio tracks, and bind each reference to a character, motion or voice.
Second-by-second timeline
Write timestamped beats like 0-3s and 3-8s so Seedance 2.5 paces the shot exactly the way you planned.
First & last frame
Anchor the opening and closing frames to lock the shape of the whole shot.
Edit, extend & restyle
Say add, remove, replace or extend, and Seedance 2.5 reworks an existing clip instead of starting over.
Reusable asset library
Save inputs and Seedance outputs to remix later without re-uploading.
Conversation history
Prompts, references and Seedance outputs all live in one creative thread.
Seedance 2.5 FAQ
Answers for creators directing long-form multimodal AI video with Seedance 2.5.
What is Seedance 2.5?
Seedance 2.5 is ByteDance's multimodal video model. It generates up to 30 seconds of video with synchronized audio, follows second-level timestamps, and accepts image, video and audio references as creative direction.
How is Seedance 2.5 different from Seedance 2.0?
Three things: clips run up to 30 seconds instead of a few, timing is controlled by real timestamps rather than shot numbers, and a single job can reference up to 50 files across images, video and audio.
What inputs does Seedance 2.5 support?
Text prompts plus optional references: up to 30 images, 10 videos and 10 audio tracks, capped at 50 files per generation. Reference video and audio should run 2 to 30 seconds.
What resolution and duration does Seedance 2.5 support?
480p and 720p, with durations from 4 to 30 seconds and aspect ratios from 21:9 to 9:16.
Does Seedance 2.5 generate sound?
Yes. Dialogue, sound effects and ambience are generated in sync with the picture, and you can ask for ambient sound only, no music, or no audio at all.
Is there a free Seedance 2.5 trial?
Yes. New HeyMarmot accounts include starter credits so you can try Seedance 2.5 before upgrading.
Explore more AI video resources
See Seedance inspirations, check pricing, or read the Seedance 2.5 prompting guide.