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Open Source API and interchange format for editorial timeline information.
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tdervieux and ssteinbach Add Effect Widget. (#457)
* display now the inclusive last frame of a clip instead of the exclusive
* Add a widget to show which clips have effects on them
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Supported VFX Platform Versions Supported Versions Build Status codecov docs

Main web site:



Discussion Group:!forum/open-timeline-io


OpenTimelineIO is currently in Public Beta. That means that it may be missing some essential features and there are large changes planned. During this phase we actively encourage you to provide feedback, requests, comments, and/or contributions.


OpenTimelineIO is an interchange format and API for editorial cut information. OTIO is not a container format for media, rather it contains information about the order and length of cuts and references to external media.

OTIO includes both a file format and an API for manipulating that format. It also includes a plugin architecture for writing adapters to convert from/to existing editorial timeline formats. It also implements a dependency- less library for dealing strictly with time, opentime.

You can provide adapters for your video editing tool or pipeline as needed. Each adapter allows for import/export between that proprietary tool and the OpenTimelineIO format.


Documentation, including quick start, architecture, use cases, API docs, and much more, is available on ReadTheDocs


OpenTimelineIO supports, or plans to support, conversion adapters for many existing file formats, such as Final Cut Pro XML, AAF, CMX 3600 EDL, etc.


Other Plugins

OTIO also supports several other kinds of plugins, for more information see:

  • Media Linkers - Generate media references to local media according to your local conventions.
  • HookScripts - Scripts that can run at various points during OTIO execution (ie before the media linker)
  • SchemaDefs - Define OTIO schemas.

Installing / Quick-Start

You can install OpenTimelineIO via

pip install opentimelineio

For more details, including how to run the included viewer program, see:

Example Usage

import opentimelineio as otio

timeline = otio.adapters.read_from_file("foo.aaf")
for clip in timeline.each_clip():
  print, clip.duration()

There are more code examples here:

Also, looking through the unit tests is a great way to see what OTIO can do:

OTIO includes a viewer program as well:

OTIO View Screenshot


If you want to contribute to the project, please see:

You can get the latest development version via:

git clone OpenTimelineIO

You can install development dependencies with pip install -e .[dev]

You can also install the PySide2 dependency with pip install -e .[view]

Currently the code base is written against python 2.7 and python 3.5, in keeping with the pep8 style. We ask that before you submit a pull request, you:

  • run make test -- to ensure that none of the unit tests were broken
  • run make lint -- to conform to pep8
  • run make coverage -- to detect code which isn't covered



For more information, please visit or or join our announcement mailing list:!forum/open-timeline-io

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