This package provides a dependency-light OpenTimelineIO (OTIO) <https://github.com/AcademySoftwareFoundation/OpenTimelineIO> document layer in pure R. Provides constructors for the OTIO object model (timelines, tracks, clips, gaps, media references, rational times and time ranges), functional builders that return new objects, and readers and writers for canonical .otio files through jsonlite'. The optional RcppOTIO package validates output against the real OpenTimelineIO C++ library. No compiled code.