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Some tech stuff, this is added per frame to mpg user data.
closed caption file format (.scc) which consists of the time code followed on the same line by a sequence of sets of 4 HEX codes representing the actual closed captioning data that will be added to the picture header user_data. This is CEA 608 standard. Only two codes per frame. user data field will start with 02 09
Another way
Up to 30 codes in each GOP. The first bytes in the user data field will be 43 43 01 f8 9e
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