# How do the properties written by the Python OTIO annotation hook differ from those written by the Mu Annotate mode for the same pen stroke or text box?

- id: art_01M5MENNNYD72JEZ50QBNR53KH
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T10, T11 · tags: none
- updated: 2026-10-23T13:19:43.288Z
- url: https://veyrul.com/articles/art_01M5MENNNYD72JEZ50QBNR53KH

The OTIO import hook writes pen strokes with fixed constants (debug 1, join 3, cap 1, splat 0), copies uuid and soft-deleted state from the OTIO layer, treats invisible layers as deleted and leaves them out of frame:N.order, and writes no undo/redo stacks; the interactive Mu mode generates uuid4 ids and keeps per-user undo/redo stacks. Imported drawings therefore are not undoable like hand-drawn ones.

The OTIO import hook writes pen strokes with fixed constants (debug 1, join 3, cap 1, splat 0), copies uuid and soft-deleted state from the OTIO layer, treats invisible layers as deleted and leaves them out of frame:N.order, and writes no undo/redo stacks; the interactive Mu mode generates uuid4 ids and keeps per-user undo/redo stacks. Imported drawings therefore are not undoable like hand-drawn ones.

Curator qualifications: Code read 2026-10-22 at OpenRV 27db5464; nothing run. Text font property differences from producer reading.

Limitations: Code read 2026-10-22 at OpenRV 27db5464; nothing run.

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/OpenRV/blob/27db5464a90ca19a9a30d540988ee109ee06bb7e/src/plugins/rv-packages/otio_reader/annotation_hook.py",
      "note": "otio_reader/annotation_hook.py L124-L143, L279-L287; annotate/annotate_mode.mu (uuid4 generation; undo_/redo_ stacks)"
    },
    {
      "url": "https://github.com/AcademySoftwareFoundation/OpenRV/blob/27db5464a90ca19a9a30d540988ee109ee06bb7e/src/plugins/rv-packages/annotate/annotate_mode.mu",
      "note": "otio_reader/annotation_hook.py L124-L143, L279-L287; annotate/annotate_mode.mu (uuid4 generation; undo_/redo_ stacks)"
    },
    {
      "url": "https://github.com/AcademySoftwareFoundation/OpenRV/blob/27db5464a90ca19a9a30d540988ee109ee06bb7e/src/lib/ip/IPBaseNodes/PaintIPNode.cpp",
      "note": "otio_reader/annotation_hook.py L124-L143, L279-L287; annotate/annotate_mode.mu (uuid4 generation; undo_/redo_ stacks)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] The OTIO import hook writes pen strokes with fixed constants (debug 1, join 3, cap 1, splat 0), copies uuid and soft-deleted state from the OTIO layer, treats invisible layers as deleted and leaves them out of frame:N.order, and writes no undo/redo stacks; the interactive Mu mode generates uuid4 ids and keeps per-user undo/redo stacks. Imported drawings therefore are not undoable like hand-drawn ones. · locator: otio_reader/annotation_hook.py L124-L143, L279-L287; annotate/annotate_mode.mu (uuid4 generation; undo_/redo_ stacks) · source: https://github.com/AcademySoftwareFoundation/OpenRV/blob/27db5464a90ca19a9a30d540988ee109ee06bb7e/src/plugins/rv-packages/otio_reader/annotation_hook.py

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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