AI Closed Captions and Vocabularies
This article assumes you already have a Live Stream set up. If you haven't, see Jomablue Live Streaming first.
This article does not cover captions for Self Hosted Live Stream (which uses captions embedded in your own HLS playlist) or Simulated Live Stream (which supports open captions only, not AI-generated closed captions). See Live Streaming Options in Jomablue if you're unsure which method you're using.
What Are AI Closed Captions?
AI Closed Captions use a speech-to-text engine to automatically generate captions from what's being said during your Live Stream. Once enabled, a Closed Captions button appears in the Live Stream player, letting attendees turn captions on if they want them.
A note on accuracy: AI Closed Captions are provided on a best-effort basis. While generally accurate, occasional discrepancies are expected, particularly with company names, product names, acronyms, or other industry-specific jargon. Vocabularies (below) help reduce these discrepancies for terms specific to your event.
Enabling AI Closed Captions
Note: If the Live Stream is currently active (meaning it's receiving content at its ingest URL, or has streamed within the past 5 minutes) you won't be able to change this setting. An error message will appear if you try. Enable AI Closed Captions before your stream goes live, not during it.
Once enabled, viewers will see a Closed Captions toggle in the player whenever the stream is active, letting them turn captions on and off as they choose.
Vocabularies
A Vocabulary is a list of specific words and phrases you provide to the speech-to-text engine, used alongside its standard library. Use one for terms the engine might otherwise misinterpret, such as company names, product names, speaker names, acronyms, or industry-specific jargon, so they are more likely to appear correctly in your captions.
Creating a Vocabulary
This opens the Vocabulary detail screen, showing the Vocabulary's name, its external ID (used by the underlying live streaming service), and a list of linked Live Streams (empty until you associate one).
