# When review notes go into a CMX3600 EDL as comments (LOC lines) and come back, what is kept and what is lost?

- id: art_01M5MEDH61HPPZ8JYS2WVZGCC3
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T04, T10 · tags: none
- updated: 2026-10-23T13:15:16.537Z
- url: https://veyrul.com/articles/art_01M5MEDH61HPPZ8JYS2WVZGCC3

The OTIO CMX 3600 adapter reads '* LOC: <timecode> <COLOR> <text>' into a zero-duration Marker named with the text (source colour word kept in metadata, unknown colours become RED, non-matching lines silently skipped) and writes each marker back as LOC with start timecode, colour and the upper-cased name; duration and Marker.comment are lost and positions depend on the EDL rate. Drawn annotations have no slot.

The OTIO CMX 3600 adapter reads '* LOC: <timecode> <COLOR> <text>' into a zero-duration Marker named with the text (source colour word kept in metadata, unknown colours become RED, non-matching lines silently skipped) and writes each marker back as LOC with start timecode, colour and the upper-cased name; duration and Marker.comment are lost and positions depend on the EDL rate. Drawn annotations have no slot.

Curator qualifications: Code read 2026-10-22; no tool run; arithmetic below reproduces the code path in Python, not Kitsu itself.

Limitations: Code read 2026-10-22; no tool run; arithmetic below reproduces the code path in Python, not Kitsu itself.

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/AcademySoftwareFoundation/OpenTimelineIO/blob/44236713c1db295a6ffc66189ae98dbdfd0cb9c4/docs/tutorials/otio-serialized-schema.md",
      "note": "otio-cmx3600-adapter cmx_3600.py at 4b02a666 L517-564 (LOC read); same file L1314-1326 (LOC write)"
    },
    {
      "url": "https://github.com/OpenTimelineIO/otio-cmx3600-adapter/blob/4b02a6668b4ddb435bd6b8e7459e1dbd170938df/src/otio_cmx3600_adapter/cmx_3600.py",
      "note": "otio-cmx3600-adapter cmx_3600.py at 4b02a666 L517-564 (LOC read); same file L1314-1326 (LOC write)"
    },
    {
      "url": "https://github.com/AcademySoftwareFoundation/OpenTimelineIO/blob/44236713c1db295a6ffc66189ae98dbdfd0cb9c4/docs/tutorials/feature-matrix.rst",
      "note": "otio-cmx3600-adapter cmx_3600.py at 4b02a666 L517-564 (LOC read); same file L1314-1326 (LOC write)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] The OTIO CMX 3600 adapter reads '* LOC: <timecode> <COLOR> <text>' into a zero-duration Marker named with the text (source colour word kept in metadata, unknown colours become RED, non-matching lines silently skipped) and writes each marker back as LOC with start timecode, colour and the upper-cased name; duration and Marker.comment are lost and positions depend on the EDL rate. Drawn annotations have no slot. · locator: otio-cmx3600-adapter cmx_3600.py at 4b02a666 L517-564 (LOC read); same file L1314-1326 (LOC write) · source: https://github.com/AcademySoftwareFoundation/OpenTimelineIO/blob/44236713c1db295a6ffc66189ae98dbdfd0cb9c4/docs/tutorials/otio-serialized-schema.md

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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