Seedance 2 deep dive

Seedance 2.0 Deep Dive

Use this skill when shot-specifier routes a shot to seedance_2_0 or when video-generator is about to submit Seedance 2.0 jobs through the Higgsfield Model Context Protocol (MCP).

Seedance 2.0 is best treated as a constraint-driven multimodal video model, not a text-prompt toy. Text describes the new action. Images, video, and audio references carry identity, style, motion, rhythm, and continuity. The practical skill is deciding which constraints matter, passing them explicitly, and keeping each clip short enough that the model does not drift.

Live-Schema Rule

Before any production generation, inspect the live Higgsfield MCP schema through video-generator. Public guidance and creator reports disagree on exact model IDs, quality modes, file limits, duration ranges, and reference roles.

Use the limits below as planning defaults only. If the live MCP schema is narrower, follow the live schema. If the required references cannot be supplied, stop and ask for a production decision.

S01 session 2 observed that the current Higgsfield MCP accepted a Seedance resolution=1080p input while still downloading 1344x768 video, and auto-enabled generated audio without exposing a generate_audio input key. Treat resolution settings as schema-gated quality hints until the downloaded pixels prove otherwise. Treat audio toggles as intent records unless the live schema exposes them.

When Seedance 2.0 Is The Right Route

Prefer Seedance 2.0 when the shot needs:

• consistent character, costume, product, prop, or recurring visual element identity;
• multiple image references acting as hard creative constraints;
• a short but polished action beat, hook, transformation, product move, or b-roll shot;
• audio-driven pacing from a chosen track, ambience, voice, or sound-effect reference;
• campaign or sequence coherence across many clips;
• image-to-video work from carefully designed start and end frames.

Do not default to Seedance 2.0 when the main requirement is maximum native resolution, long single-shot duration, low-setup one-off generation, exact on-screen text, complex hands, or a large multi-character scene with many competing subjects. Consider Kling for camera-motion-heavy exteriors or motion-control work; consider Veo/native-audio routes when generated audio is the asset rather than an input constraint.

Planning Defaults

Decision	Default	Reason
Duration	6-8 s first pass; 4-6 s for identity-critical inserts; keep most clips under 10 s	Drift rises with duration; split long ideas into crisp segments
Upper limit	15 s only for deliberate hero tests or structured multi-shot prompts	Last seconds are more likely to soften, mutate, or lose continuity
Aspect ratio	Choose before writing the prompt	Ratio changes composition pressure and what the model emphasizes
9:16	One strong subject, clean background, text safe area if overlays exist	Tall frames push faces and foreground action forward
16:9	Add background control: simple layout, limited background motion, clear negative space	Wide frames invite extra set detail and artifacts
1:1 or 4:5	Product, feed, and commercial detail when supported	Keeps product scale readable without excessive background
Quality	Draft in fast/medium; final in high only after the shot is coherent	Higher quality sharpens both good detail and bad wobble
Resolution	Use the manifest's resolution hint for finals when exposed; verify actual pixels after download	S01 current MCP evidence emitted 1344x768 despite a 1080p Seedance hint
Batch strategy	Build a shot list and reference plan before spending credits	Random exploration burns budget and weakens continuity

Multimodal Input Rules

Treat each input as responsible for one job. Avoid overlapping references that ask for different styles, lighting, faces, or motion in the same slot.

Planning limits commonly reported for Seedance 2.0:

• up to 12 files total across images, videos, and audio;
• up to 9 image references;
• up to 3 video references, with short clips preferred;
• up to 3 audio references, with clean, short clips preferred;
• generated output commonly planned in the 4-15 s range.

Verify those values against the live Higgsfield MCP before generation.

Prioritize file slots in this order:

1. Start and end frame anchors when the workflow requires them.
2. Principal character or product identity.
3. Active hero prop and recurring visual elements.
4. Specific location or set layout.
5. Motion or camera reference video.
6. Audio reference for beat, mood, voice, or ambience.
7. Style reference.
8. Supporting detail references.

If the tool exposes input weights, start here:

Input	Starting weight	Use
Character/product image	0.80-0.85	Exact appearance, costume, object design, brand detail
Aesthetic/style image	0.75-0.80	Colour, lighting, texture, finish
Environment image	0.60-0.75	Location layout and atmosphere
Motion/camera video	0.50-0.60	Camera path, choreography, pacing
Audio reference	0.40-0.50	Mood, tempo, energy, beat timing

Raise a weight only when that input is underrepresented. Lower it when it dominates the shot or pulls the output away from higher-priority continuity.

Reference Prompting

Use @ references or the MCP's equivalent media-role syntax with a declared purpose. Never pass references as an undifferentiated pile.

Bad:

Use @Image1, @Image2, and @Video1 to make this cinematic.

Good:

@Image1 for Switch's exact face, hair, and jacket. @Image2 for the control-room monitor
layout and screen colours. @Video1 for the slow handheld push-in only, not its lighting.

For character consistency, use the same master character image or small character package in every shot where the character appears. State that facial features, build, hair, and costume identity must remain exact. For recurring visual elements, pass the locked reference every time the element is visible.

Prompt Structure

For simple image-to-video shots:

Subject + Action + Scene + Camera + Style

Keep the prompt concrete. One subject, one action, one place, one camera idea. Use verbs and timing, not mood labels alone.

For multimodal production shots, use CRAFT:

Section	Purpose
Context	Location, time, atmosphere, story situation
References	Which media inputs matter and exactly what each controls
Action	What subjects do, in physical order
Framing	Shot size, lens feel, camera mount, movement, angle
Timing	Seconds, beats, cuts, audio sync, ending state

For multi-shot prompts, specify shot structure up front:

Total: 8 s / 2 shots / 16:9.
Shot 1, 0-4 s: ...
Shot 2, 4-8 s: ...

For one continuous shot, say so explicitly and add camera negatives:

Single continuous shot. No cuts, no zoom, no angle changes, natural head movement.

Format Patterns

Use these patterns as starting points, not templates to paste blindly.

Format	Strong pattern
Transformation	Numbered beats with an escalation arc: calm, disruption, transformation, consequence, reset
POV	Say the camera is the character's eyes; no cuts; hands visible if needed; natural head movement; concrete body motion
Fight or chase	Clear location, clear power mismatch or objective, beat-by-beat choreography, impact timings
Product/commercial	Product refs first; simple motion; limited background; lock logo/text in the source image rather than asking the model to invent it
B-roll/hook	3-6 s, one clean visual idea, immediate readable motion, strong first frame
Animation/VFX	Timed segments; explicit VFX appearance inline; physics and particles described concretely
Audio-synced	Use the audio reference for tempo and mood; mark visual events against seconds or beats

Narration is handled outside this video-generation workflow. Do not request generated narration from Seedance. If the live route forces generated audio on and cannot disable it, proceed only for ambience/sound-effect-friendly atmosphere shots where the audio will be accepted or muted downstream; stop for dialogue, lip-sync, supplied-audio, music-timed, or narration/post-audio shots.

Settings Sweep

When a shot is not working, change one variable per run. Keep prompt, seed, and references fixed unless that variable is the thing being tested.

1. Duration: compare 6 s against 8-10 s. If the shorter clip is cleaner, split the shot.
2. Aspect ratio: test the target ratio with one line rewritten for composition pressure: single subject for 9:16, controlled background for 16:9.
3. Quality: raise quality only after the first two seconds are stable.
4. Reference weights: increase the missing constraint; reduce the dominant, unhelpful one.
5. Seed: keep a good seed for refinement; refresh if colour or identity keeps drifting despite coherent references.

Stop tweaking settings when the shot concept itself is overloaded. Split, simplify, or return to shot-specifier for a new shot design.

Failure Rules

Symptom	Response
First two seconds wobble	Restart or simplify the opening beat; early instability rarely fixes itself
Face, logo, prop, or recurring element changes shape	Split the shot or strengthen the exact reference; do not rely on quality mode
Lighting flickers	Anchor one source and one surface; if it persists, shorten or change angle
Hands break	Avoid complex gestures; show hands at rest or cut to a separate insert
Output feels chaotic	Reduce camera moves, subjects, and beat count; replace frantic language with smooth pacing
Motion reference dominates	Lower video-reference weight and restate image references as identity anchors
Image style is weak	Increase style/reference image weight and remove conflicting aesthetic language
Audio does not drive timing	Use cleaner audio, shorter audio, and explicit second/beat markers
Text or UI is wrong	Bake text/UI into the start or end frame; animate minimally

Handoff Rules

shot-specifier should use this skill before Phase 7 when a shot is routed to seedance_2_0. It should emit:

• why Seedance 2.0 is the recommended model;
• duration and aspect ratio chosen using the defaults above;
• required reference files with explicit purpose;
• any planned motion or audio references;
• whether the prompt is single-shot, multi-shot, POV, transformation, product, animation/VFX, or audio-synced;
• a concise ## Generation Prompt suitable for the Higgsfield MCP.

video-generator should use this skill when submitting Seedance 2.0 jobs. It should validate:

• exact live MCP model ID for Seedance 2.0;
• live duration, resolution, quality, and aspect-ratio support;
• whether the route accepts start/end frames, generic image references, video references, audio references, weights, seeds, and quality modes;
• whether every required reference can fit inside the live file limit.

If live tool limits prevent the reference plan from being supplied, stop. Do not drop a character, prop, recurring visual element, start frame, or end frame to make the call fit.