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ELAN reference time envelopes

Follow EAF annotation references to declared ancestor time boundaries.

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Example result

How it works

Follow ANNOTATION_REF chains to ALIGNABLE_ANNOTATION slots. Keep PREVIOUS_ANNOTATION as symbolic order, report cycles and unknown times, and preserve exact integer millisecond values.

a2 and a3 both reach a1’s 100…250 ms envelope. Its duration is 150 ms; neither reference receives an invented own interval.

Limits

No-namespace EAF fields, up to 5000 annotations, 128 reference levels and bounded chain output. Symbolic subdivisions inherit an envelope, not equal time slices. Missing TIME_VALUE and non-millisecond time units stay unknown. No media, FPS inference or complete schema validation.