Seedance 2.0 (ByteDance)

Switch away only for a specific reason: strict budget (use the fast variant or LTX), user-preferred provider (VEO/Sora/Kling), or a stylistic fit that favors another model.

Provider surfaces

fal.ai model IDs (used by seedance_video)

bytedance/seedance-2.0/text-to-video
bytedance/seedance-2.0/image-to-video
bytedance/seedance-2.0/reference-to-video        # 9 img + 3 vid + 3 audio
bytedance/seedance-2.0/fast/text-to-video
bytedance/seedance-2.0/fast/image-to-video
bytedance/seedance-2.0/fast/reference-to-video

Pricing (fal.ai, 720p): standard $0.3034 / s (T2V), $0.3024 / s (I2V). Fast $0.2419 / s across endpoints. The fast variant trades some camera/motion fidelity for latency and cost — do not route slow-mo, multi-shot, or dolly-heavy prompts to fast on the first try.

Calling Seedance 2.0 inside OpenMontage

Always go through video_selector with preferred_provider="seedance" (or let the scoring engine pick it):

from tools.tool_registry import registry
registry.ensure_discovered()
selector = registry.get("video_selector")
result = selector.execute({
    "prompt": PROMPT,
    "preferred_provider": "seedance",
    "operation": "text_to_video",       # or image_to_video / reference_to_video
    "aspect_ratio": "21:9",             # 21:9 / 16:9 / 9:16 / 4:3 / 1:1 / 3:4
    "duration": "10",                   # auto / 4..15
    "resolution": "720p",               # 480p / 720p
    "output_path": "projects/<proj>/assets/video/clip_01.mp4",
})

Direct call to the provider tool (only when you must bypass the selector):

seedance = registry.get("seedance_video")
seedance.execute({
    "prompt": PROMPT,
    "model_variant": "standard",   # "standard" or "fast"
    "operation": "text_to_video",
    "aspect_ratio": "21:9",
    "duration": "10",
    "resolution": "720p",
    "generate_audio": True,
    "seed": 12345,                 # optional, for reproducible variations
    "output_path": "...",
})

Prompt structure

Seedance 2.0 is unusually literal about camera language, multi-shot cuts, and quoted dialogue. Use this 8-part template:

[Shot / framing] + [Camera movement] +
[Subject description — physical detail that must persist across shots] +
[Action beat 1] → [optional cut] → [Action beat 2] +
[Setting / environment] + [Lighting / palette] +
[Style / grade / era] + [Audio — ambient, diegetic, music, dialogue]

Multi-shot inside one generation

Seedance honors explicit shot lists inside a prompt. Format each shot:

Shot 1 (wide establishing, slow aerial push-in): ...
Shot 2 (medium close-up, handheld): ...
Shot 3 (extreme close-up, rack focus): ...

Keep subject description consistent across shots for identity stability.

Lip-sync from quoted dialogue

Aang stands on the cliff edge, staff raised, wind in his cloak.
Aang says: "I won't run anymore."
Sokka, half a step behind, replies: "Then we fight."

Use Character says: "..." / Character replies: "..." exactly — mouth shapes key off quoted strings. Keep each line under ~6 words; longer lines risk drift on fast clips.

Audio cues that work

Ambient: distant thunder rolling over mountains, wind through reeds, crackling campfire Diegetic: boots crunching snow, staff planting on stone, wingbeats overhead Music direction (light touch only): low orchestral swell building, taiko drums entering on Shot 3 Do not request complex multi-instrument scores — keep music language textural.

Reference-to-video

When you have character / product / wardrobe references, use the reference-to-video endpoint and name each asset in the prompt:

Reference 1: hero character (Aang) — bald, blue arrow tattoo, orange robes.
Reference 2: environment plate — snowy Air Temple courtyard at dawn.
Shot 1: Aang (from reference 1) walks across the courtyard (reference 2),
wind lifting his robes. Low-angle tracking shot, slow push-in.

Parameter guidance

What to avoid

Iteration strategy

1. Block out shape with a single duration=5 fast T2V pass at the intended framing. Confirm the composition works.
2. Lock the seed once the composition reads.
3. Upgrade to standard with the same seed, tighten camera and lighting language.
4. Extend and add shots — move to multi-shot or longer duration only after a single-shot version is clean.
5. Keep a per-clip README with prompt + seed + variant for every shot that makes the cut, so the compose stage can re-render consistent retakes.

Integration notes for OpenMontage pipelines

• Cinematic pipeline: Seedance 2.0 is the default video model. Use 21:9 for hero, multi-shot for montage beats, reference-to-video when the brief has a visual bible.
• Animated explainer: Use Seedance 2.0 for the establishing / mood clips only; most shots should stay in Remotion. Don't replace Remotion motion graphics with Seedance — different tool, different job.
• Screen demo / podcast / clip factory: Seedance is not the right default — these are footage-led. Only use for stylized cold-opens.
• Cost discipline: standard at 10 s ≈ $3.03 per clip. Budget accordingly in the proposal stage. fast at 5 s ≈ $1.21 for previews.

Verification checklist for every Seedance shot

• Motion reads coherently at the chosen shot length
• Audio is actually synced (check dialogue + foot/impact hits)
• Character identity matches reference / prior shots
• Camera direction matches the prompt (no auto-dolly when you asked for static)
• No readable text the model tried to render
• Grade matches the approved style playbook
• Output duration matches what you requested (some endpoints round)

Sources

• fal.ai Seedance 2.0: https://fal.ai/seedance-2.0
• fal.ai how-to-use: https://fal.ai/learn/tools/how-to-use-seedance-2-0
• Replicate bytedance collection: https://replicate.com/bytedance
• HeyGen Seedance 2.0: https://www.heygen.com/blog/introducing-seedance-2-and-heygen
• Runway Seedance: https://runwayml.com/product/seedance
• BytePlus Dreamina Seedance 2.0: https://www.byteplus.com/en/product/seedance
• Freepik Seedance 2.0: https://www.freepik.com/seedance-2
• Higgsfield Seedance 2.0: https://higgsfield.ai/seedance/2.0
• Pollo Seedance 2.0: https://pollo.ai/m/seedance/seedance-2-0
• ByteDance Seed official: https://seed.bytedance.com/en/seedance2_0
• Seedance 2.0 Wikipedia: https://en.wikipedia.org/wiki/Seedance_2.0