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Live captions combining AI and human captioners
Line 21 Live Captions is a live captioning platform where AI and human specialists work together to deliver accurate, readable captions for streams and recordings.
The service combines manual captioning with automatic speech recognition (ASR) to produce real-time captions. It supports RTMP and HLS streaming and provides caption encoding that follows CEA-608/708 standards.
Line 21 includes AI tools designed to improve accuracy and context across different languages and audiences:
Line 21 offers multiple options for embedding and connecting captions into your workflow:
It’s suited for media teams, education, and business use cases that need reliable captions in live and recorded formats.
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