OpenTimelineIO - Import/Export v1.0

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Contributor: Daniel Flehner Heen
Import and export OpenTimelineIO files directly in Hiero or Nuke Studio. Only tested on Linux, but should work on Windows and MacOS.
12.2, 12.1, 12.0, 11.3, 11.2, 11.1, 11.0, 10.5 or later
Linux, Mac, Windows
25 Feb 2021

OpenTimelineIO Import/Export Plugin for Hiero and Nuke Studio

Supported Versions

Import and export .otio files directly from Hiero or Nuke Studio


  • Multiple tracks
  • Tags
  • Markers
  • Simple re-time (reverese, constant slowdown, constant speedup)
  • Fade in/out and cross dissolves
  • Nested sequences are created separately and replaced with gaps in the main sequence.
  • Linked audio/video when clip shares same media source


The easiest way to install the plugin is to unpack the contents to the .nuke folder in your 'HOME' directory.
For Hiero/Nuke Studio version < 12 extract to the .hiero folder.


If you choose to install the plugin to another location, make sure to append the full path of the folder containing the Python folder to the HIERO_PLUGIN_PATH environment variable.

export HIERO_PLUGIN_PATH=/my/shared/plugin/folder


Make sure you have OpenTimelineIO available in PYTHONPATH before you launch.

Usage OTIO Import

Right click in a project bin and select 'Import->Import OTIO'

Import Bin

Or you can add tracks to an existing sequence

Import Sequence

Usage OTIOExportTask

In Hiero's export dialog choose 'Process as Sequence' and create a new preset called 'OTIO Export'.
Add a new PATH and choose 'OTIO Exporter' from the list of available exporters in the CONTENT column.
Make sure to either use the {ext} token or end your filename with an .otio extension.
The 'include tags' checkbox toggles inclusion of tags assigned to clips in the OTIO metadata.

Export Sequence

You may either export entire sequences or selected items in a sequence.

Known Limitations

  • Tags/markers are applied to both clips and track items on import if no metadata indicates source type.
MIT License Copyright (c) 2021 Daniel Flehner Heen Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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