{"schema":"record/v1","id":"art_01M5MV5PAM1PZ83RGFET29J2DC","type":"article","revision":1,"etag":"\"r1.s0\"","title":"I need to hand a J-cut or L-cut from one editing tool to another: which interchange format has a field for it, and what do the OTIO adapters do with that field?","summary":"Each format expresses a split edit differently. A CMX3600-style EDL uses a SPLIT: header plus paired video and audio rows (one worked example). FCPXML names audioStart and audioDuration as the J/L-cut mechanism in Apple's DTD comment. AAF has no split object: audio and video are separate slots that its edit protocol calls synchronized but independent. OTIO has separate tracks and no clip-linking construct (its linking issue is open). Of the open-source EDL readers inspected, the OTIO adapter validates the split marker and discards its value, a Rust OTIO port documents not modelling it, and one importer warns that it is not applied; the FCPX adapter never reads audioStart/audioDuration. 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Per-format representation (EDL SPLIT, FCPXML audioStart/audioDuration, AAF separate tracks) as stated.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://www.edlmax.com/edlmaxhelp/edl/maxguide.html","note":"candidate evidence excerpts"},{"url":"https://developer.apple.com/documentation/professional-video-applications/document-type-definition","note":"candidate evidence excerpts"},{"url":"https://static.amwa.tv/as-01-aaf-edit-protocol-spec.pdf","note":"candidate evidence excerpts"},{"url":"https://github.com/AcademySoftwareFoundation/OpenTimelineIO/blob/f8a2f36df61ce88eb6b73a57df393a87d3e3e42e/docs/tutorials/otio-timeline-structure.md","note":"candidate evidence excerpts"},{"url":"https://github.com/AcademySoftwareFoundation/OpenTimelineIO/issues/343","note":"candidate evidence excerpts"},{"url":"https://github.com/OpenTimelineIO/otio-cmx3600-adapter/blob/4b02a6668b4ddb435bd6b8e7459e1dbd170938df/src/otio_cmx3600_adapter/cmx_3600.py","note":"candidate evidence excerpts"},{"url":"https://github.com/OpenTimelineIO/otio-fcpx-xml-adapter/blob/c61839e105fb035589d3ec704b1266a22089b425/src/otio_fcpx_xml_adapter/fcpx_xml.py","note":"candidate evidence excerpts"},{"url":"https://github.com/OpenTimelineIO/otio-aaf-adapter/blob/47886982d67c00573ad4a565ae51ad0e73f4caff/src/otio_aaf_adapter/adapters/advanced_authoring_format.py","note":"candidate evidence excerpts"},{"url":"https://github.com/alchemist-editor/otio-rust/blob/4910d0546c23691dca398040cfa12e599d102176/crates/otio-cmx3600/src/read.rs","note":"candidate evidence excerpts"},{"url":"https://github.com/0xsline/OpenChatCut/blob/7fa4b7903e7ebecf832a36249f0c0c755200cc17/src/agent/tools/timeline-import-edl.ts","note":"candidate evidence excerpts"}]},"categories":["T10","T13"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://www.edlmax.com/edlmaxhelp/edl/maxguide.html","claim":"Each format expresses a split edit differently. 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A CMX3600-style EDL uses a SPLIT: header plus paired video and audio rows (one worked example). FCPXML names audioStart and audioDuration as the J/L-cut mechanism in Apple's DTD comment. AAF has no split object: audio and video are separate slots that its edit protocol calls synchronized but independent. OTIO has separate tracks and no clip-linking construct (its linking issue is open). Of the open-source EDL readers inspected, the OTIO adapter validates the split marker and discards its value, a Rust OTIO port documents not modelling it, and one importer warns that it is not applied; the FCPX adapter never reads audioStart/audioDuration. Treat all of this as code-reading, not execution.\n\nCurator qualifications: Quoted excerpts located; E10 is a producer synthesis sentence, not a source quote. 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