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Caption Central |
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Caption channelsLine 21 captioning allows for four distinct "channels" of captioning information, known as CC1 through CC4. CC1 and CC2 are both in the first field of line 21, meaning that they share bandwidth. If there is a lot of data in CC1, there will be little room for CC2 data. Similarly CC3 and CC4 share the second field of line 21. Since some early caption decoders supported only CC1 and CC2, captions in a second language were often placed in CC2. This led to bandwidth problems, however, and the current FCC recommendation is that bilingual programming should have the second caption language in CC3. |
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