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private data in mpeg2 streams
Yes, that is exactly what I'm asking. Actually, very specifically I need to mux broadcast format closed caption data into an mpeg2, this is apparently stored in as user data.
If this were possible, I could edit video directly and have the caption stream, and audio stream, stay in sync with no extra steps.
Another purpose is to add captions to an mpeg just before authoring.
I tried one tool, ccmux, from scc_tools, but it didn't work.
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