> For the complete documentation index, see [llms.txt](https://docs.pletor.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pletor.ai/models/video-models/seedance-2.5.md). # Seedance 2.5 A state-of the art video generation model developed by ByteDance. ## Overview **Evolution from** [Seedance 2.0](/models/video-models/seedance-2.0.md). Key upgrades include up to 30-second generations (double the previous ceiling), sharper realism, finer creative control with bold camera moves, massively expanded reference budgets, more languages, and negative prompts that actually hold. The prompt is a script: write with timecodes, end states and transitions, and the model shoots them in one take. Twice the price of Seedance 2.0. > **Note:** Content policies frequently block reference images containing humans, even innocuous ones. See Weaknesses below for workarounds. *** #### Strengths * **30-second one-takes**: Real narrative arcs in a single generation. Pair with video extension for up to 60s final output — minute-long ads in two passes. * **Duration-adaptive scripts**: Shortening the requested length compresses pacing instead of trimming beats. One master script declines cleanly into 30s / 20s / 12s / 8s cuts with no rewriting — the cheapest format-adaptation pipeline on any video model. * **Massive reference budgets**: Up to 30 image references, 10 videos (30s combined), and 10 audio clips (30s combined) per run. * **Lip-synced dialogue in 11 languages**: ZH, EN, ES, ID, MS most heavily optimized; TH, AR, PT, VI, JA, KO fully supported. On-screen text (signage, packaging, captions) can be forced to a target language. * **High-precision editing**: Replace, add, or remove elements in a time window while everything else stays untouched. Audio can be edited independently of visuals. * **Negatives that hold**: "No subtitles, no background music" finally sticks, with the right syntax (see below). #### Ideal use cases * **UGC-style and multi-register spots**: One character across wildly different visual styles via text-only casting. * **Video ads**: 30s TV cut, 15s pre-roll, and 8s paid social from one master script. * **Localized campaigns**: Single-master, multi-market declination with native lip-sync and forced on-screen text language. * **Product films**: Staged, multi-beat narratives with consistent identity and set. * **Surgical video edits**: Swap an object, strip the music, keep everything else frame-identical. #### **Weaknesses** * **Human reference images trip content policies often**, even innocuous ones (headshots, lookbook photos). Workarounds: describe characters in text with a `[CHARACTER]` block; when the exact face is mandatory, use a clean single-subject, neutral-background image and budget re-rolls. * Practical reference limits sit slightly below the on-paper caps: 1–8 distinct subjects from images, 1–5 from video, reference clips of 5–10s, edit sources under 20s. Past these, results can get lottery-like. *** ### How to use effectively **Write a shot plan, not a paragraph.** Structure every prompt as a timeline: `[0-Xs] [action]. End state: [landing frame].` One main action per window — stack two and the model picks one, or blends both badly. **Name references by their order.** Bind each asset with its ordinal (`@Image 1`, `@Image 2`, `@Video 1`) matching input order. **Give every reference a role.** One binding line per asset: `@Image 1 defines 's face, glasses, and denim jacket. Do not use the background.` Several angles of one character means several images, never a collage.
**End states carry continuity.** Each beat's closing frame is what the next beat inherits. Omit it and props teleport, poses reset. **Lock identity explicitly.** Close every prompt with character, wardrobe, and set layout. On long runs: `same face, same hairstyle, same outfit, same body type for the entire video`. **Treat windows as budgets.** A cramped window gets a rushed beat. Size each window to the action; the model paces itself inside it. **The music kill switch.** A plain "no music" often loses. The only directive that reliably holds: `[SOUND] Strictly only naturally occurring sound and foley, no music allowed.` **Write transitions as directives.** `→ WHIP PAN RIGHT on her turn, smears to white, hard cut.` Undescribed junctions are where objects appear and vanish. **Extend conservatively.** Use your base video as a reference and describe only the new material: `Extend the video naturally, [new content only], smooth motion continuity, no hard cuts, nothing appears out of thin air.` The base footage is never regenerated. Ceiling: 60s final. **Audio syntax**: `(music)` · `` · `{dialogue}` · `【subtitles】`. For non-English lines, state language and accent before the dialogue.