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How are captions encoded onto high definition tapes?

April 26, 2017captions encoded high definition tapes

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How are captions encoded onto high definition tapes?

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High Definition (HD) captions, also called 708 captions, are a part of the Vertical Ancillary Data (VANC). They aren’t part of the video signal as SD captions are. To encode, one sends the video signal through an HD closed captioning encoder and records the signal on another deck.