Closed captions refer to the visual display of the audio in a program, such as a TV broadcast.
The standards widely used for online video are:
– CEA-608, also known as Line 21
– CEA-708, the latest standard for digital television.
Live captioning with 608 and 708 is possible with Dacast’s latest default player.
Note that broadcasters need to have their own infrastructure to insert closed captions to their live streams.