# Seedance 2.5 limits from BytePlus's own API reference: 30 images / 10 videos / 10 audio, 4-30 s, 1080p (10-bit HEVC), draft tasks, and no direct real-face references

- id: art_01M5NBN27AE02WFWCGEK0ZR88V
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T06, T09, T13 · tags: none
- updated: 2026-10-23T21:46:12.067Z
- url: https://veyrul.com/articles/art_01M5NBN27AE02WFWCGEK0ZR88V

Primary ModelArk docs (model id example dreamina-seedance-2-5-260628) settle creator-reported numbers. Omni reference-to-video accepts 0-30 reference images, 0-10 reference videos and 0-10 reference audio clips plus optional text (audio-only input allowed); reference videos 2-30 s each (4-30 s for edit tasks) with a 30 s combined cap; audio clips 2-30 s with a 30 s combined cap (Seedance 2.0: max 3 videos/3 audio, 15 s caps; first/last-frame and multi-image modes: 2.5 takes 1-30 images vs 1-9 for 2.0). So the "50 references" claim is the sum of maxima (30+10+10), and "12 references" fits 2.0 (9 images + 3 videos/audio). Output: Seedance 2.5 default 720p, also 480p and 1080p (1080p output uses 10-bit colour and H.265/HEVC); Seedance 2.0 supports up to 4K; 2.0 fast/mini 720p max. A separate LAS doc says 1080p is unsupported for 2.5 in reference-image scenarios (R2) - check per endpoint. Duration: 2.5 default -1 (auto) or 4-30 s (2.0: 4-15 s); edit tasks require duration -1, ratio adap...

Primary ModelArk docs (model id example dreamina-seedance-2-5-260628) settle creator-reported numbers. Omni reference-to-video accepts 0-30 reference images, 0-10 reference videos and 0-10 reference audio clips plus optional text (audio-only input allowed); reference videos 2-30 s each (4-30 s for edit tasks) with a 30 s combined cap; audio clips 2-30 s with a 30 s combined cap (Seedance 2.0: max 3 videos/3 audio, 15 s caps; first/last-frame and multi-image modes: 2.5 takes 1-30 images vs 1-9 for 2.0). So the "50 references" claim is the sum of maxima (30+10+10), and "12 references" fits 2.0 (9 images + 3 videos/audio). Output: Seedance 2.5 default 720p, also 480p and 1080p (1080p output uses 10-bit colour and H.265/HEVC); Seedance 2.0 supports up to 4K; 2.0 fast/mini 720p max. A separate LAS doc says 1080p is unsupported for 2.5 in reference-image scenarios (R2) - check per endpoint. Duration: 2.5 default -1 (auto) or 4-30 s (2.0: 4-15 s); edit tasks require duration -1, ratio adaptive and a 4-30 s source video. generate_audio defaults to true; seeds -1..2147483647; watermark parameter available. Draft mode: generate a draft, then a final video from the draft task ID within 7 days (matches Runway's draftTaskId flow, C3-B387-01). Faces: Seedance 2.5/2.0 refuse directly uploaded reference images or videos containing real human faces; allowed routes are the model's own face-containing outputs from your account in the last 30 days, preset "digital characters" (asset://IDs), or authorised real-person assets. Language list for 2.5 adds Spanish, Indonesian, Portuguese, Japanese, Malay, Thai, Arabic, Vietnamese and Korean. Implication: creator workflows that upload a selfie as a reference (C3-B389-02, C3-B415-02) depend on host-specific authorisation flows, not the raw API.

Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Not tested; a resolution discrepancy between two vendor surfaces is unresolved. Provider documentation as served 2026-10-23; models, limits, terms and prices change without notice.

Limitations: Docs may change; LAS vs ModelArk resolution discrepancy unresolved; not tested.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://ai.byteplus.com/ark/region:ap-southeast-1/docs/create-video-generation-task-api",
      "note": "Omni reference-to-video; resolution; Note; Draft"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Primary ModelArk docs (model id example dreamina-seedance-2-5-260628) settle creator-reported numbers. Omni reference-to-video accepts 0-30 reference images, 0-10 reference videos and 0-10 reference audio clips plus optional text (audio-only input allowed); reference videos 2-30 s each (4-30 s for edit tasks) with a 30 s combined cap; audio clips 2-30 s with a 30 s combined cap (Seedance 2.0: max 3 videos/3 audio, 15 s caps; first/last-frame and multi-image modes: 2.5 takes 1-30 images vs 1-9 for 2.0). So the "50 references" claim is the sum of maxima (30+10+10), and "12 references" fits 2.0 (9 images + 3 videos/audio). Output: Seedance 2.5 default 720p, also 480p and 1080p (1080p output uses 10-bit colour and H.265/HEVC); Seedance 2.0 supports up to 4K; 2.0 fast/mini 720p max. A separate LAS doc says 1080p is unsupported for 2.5 in reference-image scenarios (R2) - check per endpoint. Duration: 2.5 default -1 (auto) or 4-30 s (2.0: 4-15 s); edit tasks require duration -1, ratio adaptive and a 4-30 s source video. generate_audio defaults to true; seeds -1..2147483647; watermark parameter available. Draft mode: generate a draft, then a final video from the draft task ID within 7 days (matches Runway's draftTaskId flow, C3-B387-01). Faces: Seedance 2.5/2.0 refuse directly uploaded reference images or videos containing real human faces; allowed routes are the model's own face-containing outputs from your account in the last 30 days, preset "digital characters" (asset://IDs), or authorised real-person assets. Language list for 2.5 adds Spanish, Indonesian, Portuguese, Japanese, Malay, Thai, Arabic, Vietnamese and Korean. Implication: creator workflows that upload a selfie as a reference (C3-B389-02, C3-B415-02) depend on host-specific authorisation flows, not the raw API. · locator: Omni reference-to-video; resolution; Note; Draft · source: https://ai.byteplus.com/ark/region:ap-southeast-1/docs/create-video-generation-task-api

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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