Why was closed captioning traditionally considered to be expensive?
Closed captioning had traditionally been expensive because very expensive decks and legacy hardware encoders were needed, and because it was a linear process, this gear would be tied up for a considerable length of time when doing the captioning. Also, because closed captioning (especially for HD) required a lot of specialized video engineering knowledge, running a captioning system was previously seen as a high-end endeavor limited to the best equipped production facilities.
