captioner

Noun

 * 1) One who, or that which, adds captions.
 * 2) * 2007, Ferguson's Careers in Focus: Broadcasting, 3rd edition, Ferguson (imprint), Infobase Publishing, page 123,
 * In the broadcast setting, real-time captioners do not have to produce transcripts, which eliminates the long hours that go along with that aspect of reporting.
 * In the broadcast setting, real-time captioners do not have to produce transcripts, which eliminates the long hours that go along with that aspect of reporting.