{"schema":"record/v1","id":"art_01M5MRHH3YT19SRTMCQV10B1YT","type":"article","revision":1,"etag":"\"r1.s0\"","title":"How do iXML SPEED tags express NTSC frame rates and pulled-up recordings (for example 48048 Hz labelled as 48000), and which field should a conform tool trust when they disagree?","summary":"iXML SPEED gives rates as integer ratios (e.g. 30000/1001 rather than 29.97), separates timecode display rate and flag, and adds file, digitiser and timestamp sample rates so pulled-up recordings (48048 Hz labelled 48000) can be identified; readers must take the authoritative rate and timestamp from the fmt and bext chunks, not iXML copies.","status":"active","body":{"text":"iXML SPEED gives rates as integer ratios (e.g. 30000/1001 rather than 29.97), separates timecode display rate and flag, and adds file, digitiser and timestamp sample rates so pulled-up recordings (48048 Hz labelled 48000) can be identified; readers must take the authoritative rate and timestamp from the fmt and bext chunks, not iXML copies.\n\nCurator qualifications: Specifications and code read 2026-10-22; no files written or decoded. 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Per-tool behaviour not checked.\n\nLimitations: Specifications and code read 2026-10-22; no files written or decoded.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"http://www.gallery.co.uk/ixml/object_Details.html","note":"gallery.co.uk iXML object details (live) SPEED section"},{"url":"http://www.gallery.co.uk/ixml/introduction.html","note":"gallery.co.uk iXML object details (live) SPEED section"}]},"tags":[],"type":"article","links":[],"title":"How do iXML SPEED tags express NTSC frame rates and pulled-up recordings (for example 48048 Hz labelled as 48000), and which field should a conform tool trust when they disagree?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"iXML SPEED gives rates as integer ratios (e.g. 30000/1001 rather than 29.97), separates timecode display rate and flag, and adds file, digitiser and timestamp sample rates so pulled-up recordings (48048 Hz labelled 48000) can be identified; readers must take the authoritative rate and timestamp from the fmt and bext chunks, not iXML copies.","evidence":{"claims":[{"url":"http://www.gallery.co.uk/ixml/object_Details.html","claim":"iXML SPEED gives rates as integer ratios (e.g. 30000/1001 rather than 29.97), separates timecode display rate and flag, and adds file, digitiser and timestamp sample rates so pulled-up recordings (48048 Hz labelled 48000) can be identified; readers must take the authoritative rate and timestamp from the fmt and bext chunks, not iXML copies.","locator":"gallery.co.uk iXML object details (live) SPEED section","classification":"sourced_fact"}],"review":"unreviewed","execution":"not_run","inspection":"source_inspected","execution_record_ids":[]},"language":"en","categories":["T10","T13"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T13.14"],"confidence":"Low.","limitations":["Specifications and code read 2026-10-22; no files written or decoded.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. 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