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Specification

Current version · Published 2 September 2026

Cassini v1

The file structure, metadata, producer requirements and reader behavior.

Versions

v1 Current · published 2026-09-02org.cassini.portable-meeting/1
Private draft 3 History · 2026-08-29org.cassini.portable-meeting/1
Private draft 2 History · 2026-05-12org.cassini.portable-meeting/2
Private draft 1 History · 2026-03org.cassini.portable-meeting/1

Every change to the specification →

Supporting contracts

Transcript body

A word, its speaker, and start and end times in milliseconds.

cassini.words.v1

Audio digest

The exact bytes used to match a transcript to a recording, independent of its tags.

exact-opus-audio-v1

Validate your implementation

Cassini Portable Meeting Manifest v1cassini-portable-meeting-manifest-v1.schema.json15.2 KB ↗Cassini transcript body (cassini.words.v1)cassini-words-v1.schema.json3.2 KB ↗

Check a produced file → Run reader conformance checks → About the schemas →Conformance suite on GitHub ↗Download an example file ↓

Further reading

Specification text: CC BY 4.0. Schemas, test vectors and standalone readers/producer: CC0. The gocassini reference application and the site's Cassini transcript component are AGPL-3.0.