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Real-Time Web Captioning Process

Captioning live streaming video requires coordinating the captioner, an encoding system, and the video display.

The captioner (typically a reporter or voicewriter) calls into the event to obtain the audio feed.
The captioner's output stream must connect to an encoder. Either the webinar system has a captioning encoder built in or it connects with a third party online encoding service provider.
The caption encoder outputs a data stream that connects with the video display.

Here's a diagram graphically depicting this process: