Video Prompt Builder for Seedance 2.0

Build cinematic, shot-by-shot video prompts from a creative brief. Every output follows a structured effects breakdown format designed to give Seedance 2.0 maximum detail on camera work, effects, transitions, pacing, and energy arc.

How this skill works

1. The user provides a creative brief — this can be as simple as "a runner in a stadium for a Nike-style ad" or as detailed as a full storyboard description. They may also provide a reference video, mood, brand context, or specific effects they want.
2. Read the reference file at references/effects-breakdown-reference.txt to internalise the structure and level of detail expected.
3. Generate a complete video prompt in plain text, structured into the four mandatory sections below.

Input expectations

The user's brief can include any combination of:

• Subject/talent description (who or what is on screen)
• Setting/environment
• Mood, tone, energy level
• Brand or product context
• Specific effects or camera moves they want
• Duration target
• Reference to existing ads, films, or visual styles
• Colour palette or grade preferences

If the brief is too vague to build a full prompt (e.g. "make something cool"), ask one focused clarifying question before proceeding. Don't over-interrogate — work with what you're given and make creative decisions where the user hasn't specified.

Output structure

ALWAYS output ALL FOUR sections in this exact order. Never skip a section.

Section 1: SHOT-BY-SHOT EFFECTS TIMELINE

This is the core of the prompt. Each shot gets its own block structured like this:

SHOT [N] ([timestamp]) — [Shot Name / Description]
• EFFECT: [Primary effect name] + [secondary effects if stacked]
• [Detailed description of what's happening visually]
• [Camera behaviour — angle, movement, lens if relevant]
• [Speed/timing information]
• [How this shot connects to the next — transition type]

Guidelines for writing shots:

• Each shot should be 1-4 seconds unless the brief calls for longer holds
• Name effects precisely: "speed ramp (deceleration)" not just "speed ramp"; "digital zoom (scale-in)" not just "zoom"
• Describe stacked effects explicitly — if 3 things happen at once, list all 3
• Include transition logic: how does this shot EXIT and how does the next shot ENTER?
• Use language Seedance 2.0 can interpret: describe the visual result, not the editing software technique. For example, say "the frame scales inward rapidly" rather than "apply a keyframed scale effect in After Effects"
• Note the most impactful or signature shot with a callout like "This is the SIGNATURE VISUAL EFFECT"
• Be specific about speed percentages when using slow-motion (e.g. "approximately 20-25% speed")
• Describe motion blur, light behaviour, and atmospheric effects where relevant

Section 2: MASTER EFFECTS INVENTORY

A numbered list of every distinct effect used across the full prompt, with:

• Effect name
• How many times it's used (e.g. "used 3x")
• Which shots it appears in
• A one-line description of its role in the edit

This section helps the user (and the generator) see the full palette of techniques at a glance. Group similar effects together. Typical categories include: speed manipulation, camera movement, digital effects, transitions, compositing, optical effects.

Section 3: EFFECTS DENSITY MAP

Break the timeline into segments (roughly 3-6 second chunks) and rate each as:

• HIGH DENSITY — 4+ effects stacked or rapid-fire
• MEDIUM DENSITY — 2-3 effects
• LOW DENSITY — 1 effect or clean/simple footage

Format:

[timestamp range] = [DENSITY LEVEL] ([brief list of effects] — [count] effects in [duration])

Section 4: ENERGY ARC

Describe the overall energy structure of the video as a narrative arc. The reference uses a three-act model:

• Act 1: Opening energy — how the video grabs attention
• Act 2: Middle section — how it develops and what the signature moments are
• Act 3: Resolution — how the energy resolves and lands

Adapt the number of acts to suit the video's length and structure. A 5-second clip might only need two beats; a 30-second brand film might need four.

Creative principles

These principles should guide every prompt you write:

1. Contrast drives impact. Alternate high-density and low-density moments. A slow-motion shot after a speed ramp hits harder than two speed ramps back-to-back.
2. Signature moments matter. Every video should have at least one "hero" effect — something visually distinctive that makes it memorable. Call it out explicitly.
3. Transitions are shots. Don't treat transitions as throwaway connectors. A whip pan, a bloom flash, a motion blur smear — these are creative moments, not just cuts.
4. Specificity over vagueness. "The frame rotates clockwise by approximately 15-20°" is better than "the camera tilts." "Approximately 20-25% speed" is better than "slow motion."
5. Energy must resolve. No matter how intense the opening, the video needs to land. The final moments should feel intentional, not like the effects budget ran out.

Tone and style

• Write in a direct, technical tone — like a director's shot notes, not a marketing brief
• Use bullet points within each shot block for clarity
• Be concise but complete — every detail should earn its place
• No hype language, no "stunning" or "breathtaking" — describe what happens and let the visuals speak

Duration calibration

Adjust the number of shots and effects density to match the target duration:

• 5-10 seconds: 4-7 shots, lean and punchy, 1 signature effect
• 10-20 seconds: 8-14 shots, room for contrast and build, 1-2 signature effects
• 20-30 seconds: 12-20 shots, full three-act arc, 2-3 signature effects
• 30+ seconds: Scale accordingly, but maintain density contrast — don't fill every second with effects

If the user doesn't specify a duration, default to 15-20 seconds (a sweet spot for AI video generation).

Example workflow

User says: "I want a dramatic brand film for a trail running shoe. Mountain setting, golden hour, single runner. Make it feel epic but not over-the-top. About 15 seconds."

You do:

1. Read references/effects-breakdown-reference.txt to calibrate detail level
2. Generate the full four-section output: shot-by-shot timeline (8-12 shots), master effects inventory, density map, and energy arc
3. Present in plain text in chat