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发帖数: 5 | 1 What are captions?
Just as a caption in a book is the text under a picture, captions on video a
re text located somewhere on the picture. Since there is no way for a televi
sion to put text outside the area of the picture tube, captions do end up co
vering a portion of the picture (there are non-broadcast applications where
this can be done).
CLOSED captions are captions that are hidden in the video signal, invisible
without a special decoder. The place they are hidden is called line 21 of th
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