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CEA-608/708 is a standard for Digital Video Broadcasting supporting closed caption as a part of video stream. For your information, CEA-608 is for NTSC vodeos only and its captions are encoded in the signal's VBI for NTSC. CEA-708 captions are considered for digital television only and are encoded directly into the MPEG data packages. The captions follow the CEA-708-D FCC recommendations. |
For your information. there are another technolgies can support closed caption on world wide web: SRT, WebVTT, and etc.
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