loper

Loper · Editors & assistant editors

Open .otio files on your Mac.

.otio

Open timeline interchange as JSON: schemas, rational times and source ranges.

Loper is a free, minimal editor for macOS that opens OpenTimelineIO instantly and colors every part of the file, so you find the value you need at a glance and can fix it right there. No IDE, no project to load, no gray wall of text.

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lock_v12.otio opened in Loper: OpenTimelineIO with color-coded JSON
Show the file as text
{  "OTIO_SCHEMA": "Timeline.1",  "name": "Lock v12",  "global_start_time": { "OTIO_SCHEMA": "RationalTime.1", "rate": 25.0, "value": 90000.0 },  "tracks": {    "OTIO_SCHEMA": "Stack.1",    "children": [      { "OTIO_SCHEMA": "Track.1", "kind": "Video", "name": "V1" }    ]  }}

How to open .otio files

  1. Download Loper (free, Apple silicon, signed and notarized) and move it to Applications.
  2. Double-click your .otio file, drag it onto the Loper window, or right-click it and choose Open With › Loper.
  3. Want every .otio file to open in Loper? Choose Loper › Make Loper the Default Editor….

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