Project status

We built gocassini to record and transcribe Nextcloud Talk calls, and found that a single audio file carrying its own timed transcript was more useful than a recording plus a sidecar. This site publishes that format so anyone can use it. Version 1 was published on 2026-09-02.

Who uses it#

gocassini, internally. Every meeting it records is written this way. That is the only producer and, apart from the readers in this repository, the only consumer. The format is published so that other things can be built on it: a transcript viewer for meetings, a podcast with its transcript embedded, or a song with its synchronized lyrics in the audio file.

If you build something that reads or writes these files, or try to and hit a wall, please open an issue.

Stable#

The container and transport in org.cassini.portable-meeting/1 remain stable. CASSINI_FORMAT, the payload chunk naming, base64url+gzip+utf8json, the CASSINI_TX_<ID>_PAYLOAD_ prefix scheme and the cassini.words.v1 body shape are used by shipped software.

Simplification and implementation status#

The 2026-09-07 revision removes the required origin labels from word-timed transcripts, the withdrawn LLM cleanup slot, and metadata the production writer never fills. Multiple transcripts, display documents, summaries and processing provenance remain.

The Cassini follow-up was merged to main as 4c7f8bd. The Go packer and inspector, browser viewer and static exporter now accept both simplified entries and old origin labels. The readers and demos on this site use the simplified contract. Earlier Cassini builds that require role need the follow-up before opening newly produced files; merging the implementation does not itself update an installed app.

See the audit and implementation details for the comparison against current main and what remains supported.

The conformance suite checks both older files and transcripts without origin labels. Run it against your reader; its results distinguish required behavior from advisory warnings.