What 'live captions' actually means at a conference
Live captions for a conference aren't the same as the auto-captions YouTube generates after a video uploads. They're a real-time rendering of speech to text that runs alongside the spoken word, with a typical end-to-end latency of 1.5–3 seconds. That latency matters: if it grows past about four seconds the captions feel disconnected from the speaker, and attendees stop reading them. EventRecast is engineered for the live case, not the asynchronous one.
Captions also need to handle the realities of a conference: speakers with accents, technical jargon, brand and product names that aren't in any general dictionary, and the occasional Q&A where audio quality drops. The platform learns custom vocabulary on a per-event basis, so a session about 'Kubernetes admission webhooks' or a panel of speakers from six countries doesn't degrade the way a generic transcription service would.