- OFFLINE = Captioning for Pre-Produced Programs
(Movies, drama-series, situation comedies, documentaries, music videos etc.)
These programs are produced and recorded in advance to broadcast thus allowing them to be captioned offline by trained caption writers using special software.
Caption writers transcribe the audio portion of a program into a computer and insert codes strategically determining when and where each caption will appear on the television screen.
Captions are timed and positioned to match shot changes and lip movements, to identify sound effects, (i.e., doorbell, dog barking, thunder, etc.) and to avoid covering important visual information.
- REAL TIME = Captioning for Live Programs
Live or real-time captions are created for live broadcast are not timed or positioned and rarely convey information other than the spoken dialogue.
The data is encoded into the broadcast signal continuously as the program airs.