# What does MuSS report about keeping the same subject across separate shots when a reference image is given, and why do reference-conditioned models look good on reference fidelity but fail between shots?

- id: art_01M5NNZGSEYN981YMSPZB9SGVD
- 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, T20 · tags: none
- updated: 2026-10-24T00:46:40.381Z
- url: https://veyrul.com/articles/art_01M5NNZGSEYN981YMSPZB9SGVD

MuSS (arXiv 2604.23789, v3 11 Aug 2026, ACM MM 2026) pairs a movie-derived multi-shot dataset with a benchmark that decouples identity to the reference (Ref-Sub.Con) from identity between generated shots (Inter-Sub.Con, DINOv2 and InsightFace) and adds ACP-Var and CP-Rate for copy-paste. On 50 Track-2 test items the authors report Phantom 75.16 / 55.20 and VACE-14B 72.10 / 52.40 (Ref / Inter) versus their own EchoShot-based fine-tune 78.50 / 62.27, with CP-Rate 18.50% (Phantom), 21.68% (VACE-14B) and 7.35% (theirs). Multi-shot models without references were scored with a pseudo-reference taken from their first shot, so tables mix protocols. Only data-construction code is public; dataset files, benchmark code and checkpoints are not.

MuSS (arXiv 2604.23789, v3 11 Aug 2026, ACM MM 2026) pairs a movie-derived multi-shot dataset with a benchmark that decouples identity to the reference (Ref-Sub.Con) from identity between generated shots (Inter-Sub.Con, DINOv2 and InsightFace) and adds ACP-Var and CP-Rate for copy-paste. On 50 Track-2 test items the authors report Phantom 75.16 / 55.20 and VACE-14B 72.10 / 52.40 (Ref / Inter) versus their own EchoShot-based fine-tune 78.50 / 62.27, with CP-Rate 18.50% (Phantom), 21.68% (VACE-14B) and 7.35% (theirs). Multi-shot models without references were scored with a pseudo-reference taken from their first shot, so tables mix protocols. Only data-construction code is public; dataset files, benchmark code and checkpoints are not.

Curator qualifications: All reported numbers and quotes verify in the pinned v3 HTML. v1 and v3 report identical Track 2 values; v3 adds the EchoShot implementation detail and the limitations audit (E4 and E6 exist only in v3). The pseudo-reference protocol caveat is confirmed. Rights/verification notes are shown as limitations (L00 0019/ADR-0011): they restrict reuse of the cited material or record what was not verified; they are not cleared by this summary.

Limitations: [component_reuse_restriction] Dataset licence pending (README); source clip rights third-party. [component_reuse_restriction] Paper text CC BY 4.0 (arXiv line); code licence not stated.

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

```json
{
  "citations": [
    {
      "url": "https://arxiv.org/html/2604.23789v3",
      "note": "producer work copy work/muss_v3.html (sha256 equals pin; local read); producer work copy work/muss.html (sha256 equals pin; local read); producer work copy work/MuSS_README.md (sha256 equals pin; local read); producer work copy work/MuSS_download_README.md (sha256 equals pin; local read)"
    },
    {
      "url": "https://github.com/zhang-haojie/muss",
      "note": "cited at https://github.com/zhang-haojie/MuSS; producer work copy work/muss_v3.html (sha256 equals pin; local read); producer work copy work/muss.html (sha256 equals pin; local read); producer work copy work/MuSS_README.md (sha256 equals pin; local read); producer work copy work/MuSS_download_README.md (sha256 equals pin; local read)"
    },
    {
      "url": "https://github.com/zhang-haojie/MuSS",
      "note": "observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] MuSS (arXiv 2604.23789, v3 11 Aug 2026, ACM MM 2026) pairs a movie-derived multi-shot dataset with a benchmark that decouples identity to the reference (Ref-Sub.Con) from identity between generated shots (Inter-Sub.Con, DINOv2 and InsightFace) and adds ACP-Var and CP-Rate for copy-paste. On 50 Track-2 test items the authors report Phantom 75.16 / 55.20 and VACE-14B 72.10 / 52.40 (Ref / Inter) versus their own EchoShot-based fine-tune 78.50 / 62.27, with CP-Rate 18.50% (Phantom), 21.68% (VACE-14B) and 7.35% (theirs). Multi-shot models without references were scored with a pseudo-reference taken from their first shot, so tables mix protocols. Only data-construction code is public; dataset files, benchmark code and checkpoints are not. · locator: producer work copy work/muss_v3.html (sha256 equals pin; local read); producer work copy work/muss.html (sha256 equals pin; local read); producer work copy work/MuSS_README.md (sha256 equals pin; local read); producer work copy work/MuSS_download_README.md (sha256 equals pin; local read) · source: https://arxiv.org/html/2604.23789v3

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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