{"schema":"record/v1","id":"art_01M5MV5V1HK4T37YPSFCAPVARC","type":"article","revision":1,"etag":"\"r1.s0\"","title":"When a split edit moves AAF to OTIO (and on to EDL, FCP7 XML or FCPXML), what survives as timing and what is lost as pairing between the audio and video clips, according to specs, adapter code and the OTIO linking issue?","summary":"AAF and OTIO both place audio and video on separate tracks, so a split edit is just two tracks whose clip boundaries differ; the AAF Edit Protocol calls such tracks synchronized but independent. Neither OTIO nor its AAF, CMX3600 and FCP7 adapters (as read at pinned commits) has a construct for saying the two clips belong together: OTIO issue 343 has been open since 2018, the CMX adapter TODO admits linkage is lost, and the FCP7 adapter drops link elements on write. Users report Resolve and Premiere put link ids in OTIO metadata, which is unverified. Net by reading: timing offsets can travel, pairing does not.","status":"active","body":{"text":"AAF and OTIO both place audio and video on separate tracks, so a split edit is just two tracks whose clip boundaries differ; the AAF Edit Protocol calls such tracks synchronized but independent. Neither OTIO nor its AAF, CMX3600 and FCP7 adapters (as read at pinned commits) has a construct for saying the two clips belong together: OTIO issue 343 has been open since 2018, the CMX adapter TODO admits linkage is lost, and the FCP7 adapter drops link elements on write. Users report Resolve and Premiere put link ids in OTIO metadata, which is unverified. Net by reading: timing offsets can travel, pairing does not.\n\nCurator qualifications: All 13 excerpts located; no OTIO link construct; maintainers vs user comment on vendor link ids in metadata kept as compatible-but-unresolved.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://static.amwa.tv/as-01-aaf-edit-protocol-spec.pdf","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/OpenTimelineIO/otio-aaf-adapter/blob/47886982d67c00573ad4a565ae51ad0e73f4caff/src/otio_aaf_adapter/adapters/aaf_adapter/aaf_writer.py","note":"candidate evidence excerpts"},{"url":"https://github.com/OpenTimelineIO/otio-aaf-adapter/blob/47886982d67c00573ad4a565ae51ad0e73f4caff/README.md","note":"candidate evidence excerpts"},{"url":"https://github.com/AcademySoftwareFoundation/OpenTimelineIO/blob/f8a2f36df61ce88eb6b73a57df393a87d3e3e42e/docs/tutorials/feature-matrix.rst","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-fcp-adapter/blob/63824d5ca04dbda81bcced89c9fde6ab0b7e6e36/src/otio_fcp_adapter/fcp_xml.py","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"}]},"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://static.amwa.tv/as-01-aaf-edit-protocol-spec.pdf","claim":"AAF and OTIO both place audio and video on separate tracks, so a split edit is just two tracks whose clip boundaries differ; the AAF Edit Protocol calls such tracks synchronized but independent. 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Neither OTIO nor its AAF, CMX3600 and FCP7 adapters (as read at pinned commits) has a construct for saying the two clips belong together: OTIO issue 343 has been open since 2018, the CMX adapter TODO admits linkage is lost, and the FCP7 adapter drops link elements on write. Users report Resolve and Premiere put link ids in OTIO metadata, which is unverified. 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