# What does an ASC MHL offload record and not record about camera files, what happens when files are renamed or sidecars appear, and which keys do dailies tools then use to join metadata?

- id: art_01M5MRSEXNGSPQ70CDR6TQCE96
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T02, T04, T10 · tags: none
- updated: 2026-10-23T16:16:33.199Z
- url: https://veyrul.com/articles/art_01M5MRSEXNGSPQ70CDR6TQCE96

ASC MHL records per-file hash records (with optional list-level custom metadata) and has no timecode or reel field (curator text search), so clip identity for editorial lives in the files or the ALE/dailies layer; a rename keeps its history only when recorded with ASC MHL Rename (previousPath), otherwise verification fails and the file is likely registered as new; mutable sidecars such as RED .RMD may be ignored, and ignored files cannot be un-ignored within a history. Separately, Silverstack warns that ALE and MXF tape names must match for merge or relink.

ASC MHL records per-file hash records (with optional list-level custom metadata) and has no timecode or reel field (curator text search), so clip identity for editorial lives in the files or the ALE/dailies layer; a rename keeps its history only when recorded with ASC MHL Rename (previousPath), otherwise verification fails and the file is likely registered as new; mutable sidecars such as RED .RMD may be ignored, and ignored files cannot be un-ignored within a history. Separately, Silverstack warns that ALE and MXF tape names must match for merge or relink.

Curator qualifications: Specifications read 2026-10-22; no MHL generated or verified. Avid MediaLog ALE table (S25) and Cooke /i lens-data statement (S28) not re-read; Cooke document carries an earlier no-distribution hold. No licence text in the MHL PDFs or repo tree at the pin (producer; not re-checked).

Limitations: Specifications read 2026-10-22; no MHL generated or verified.

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

```json
{
  "citations": [
    {
      "url": "https://github.com/ascmitc/mhl-specification/blob/54b7eea3059f15bd7330b86d9e1e268eb2dcf039/Specification/ASCMHL_Specification_v1.0.pdf",
      "note": "ASC MHL Specification v1.0 at 54b7eea, HashList type and ASC MHL Rename; ASC MHL Implementation Guidelines v1.0 at 54b7eea, 2.1.5 Renaming and 2.4 Ignoring files; Pomfort KB: Silverstack export to Avid Media Composer, 1.1"
    },
    {
      "url": "https://resources.avid.com/SupportFiles/attach/0423001a_bk.pdf",
      "note": "ASC MHL Specification v1.0 at 54b7eea, HashList type and ASC MHL Rename; ASC MHL Implementation Guidelines v1.0 at 54b7eea, 2.1.5 Renaming and 2.4 Ignoring files; Pomfort KB: Silverstack export to Avid Media Composer, 1.1"
    },
    {
      "url": "https://cookeoptics.cn/wp-content/uploads/2021/11/Cooke-i-Technology-Part-I-2021.pdf",
      "note": "ASC MHL Specification v1.0 at 54b7eea, HashList type and ASC MHL Rename; ASC MHL Implementation Guidelines v1.0 at 54b7eea, 2.1.5 Renaming and 2.4 Ignoring files; Pomfort KB: Silverstack export to Avid Media Composer, 1.1"
    },
    {
      "url": "https://github.com/ascmitc/mhl-specification/blob/54b7eea3059f15bd7330b86d9e1e268eb2dcf039/ImplementationGuidelines/ASCMHL_Implementation-Guidelines_v1.0.pdf",
      "note": "ASC MHL Specification v1.0 at 54b7eea, HashList type and ASC MHL Rename; ASC MHL Implementation Guidelines v1.0 at 54b7eea, 2.1.5 Renaming and 2.4 Ignoring files; Pomfort KB: Silverstack export to Avid Media Composer, 1.1"
    },
    {
      "url": "https://kb.pomfort.com/silverstack/hands-on/creating-dailies/export-to-avid-media-composer/",
      "note": "ASC MHL Specification v1.0 at 54b7eea, HashList type and ASC MHL Rename; ASC MHL Implementation Guidelines v1.0 at 54b7eea, 2.1.5 Renaming and 2.4 Ignoring files; Pomfort KB: Silverstack export to Avid Media Composer, 1.1"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] ASC MHL records per-file hash records (with optional list-level custom metadata) and has no timecode or reel field (curator text search), so clip identity for editorial lives in the files or the ALE/dailies layer; a rename keeps its history only when recorded with ASC MHL Rename (previousPath), otherwise verification fails and the file is likely registered as new; mutable sidecars such as RED .RMD may be ignored, and ignored files cannot be un-ignored within a history. Separately, Silverstack warns that ALE and MXF tape names must match for merge or relink. · locator: ASC MHL Specification v1.0 at 54b7eea, HashList type and ASC MHL Rename; ASC MHL Implementation Guidelines v1.0 at 54b7eea, 2.1.5 Renaming and 2.4 Ignoring files; Pomfort KB: Silverstack export to Avid Media Composer, 1.1 · source: https://github.com/ascmitc/mhl-specification/blob/54b7eea3059f15bd7330b86d9e1e268eb2dcf039/Specification/ASCMHL_Specification_v1.0.pdf

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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