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I agree, there's already good tools to prepare CC and convert to SCC. All you need to support is muxing the SCC into MPG - there's hardly any parsing to do.
I have a feeling you are not understanding CC - these are not subs, they are never turning into bitmaps, just pure hex data put into the mpg stream. It's the TV only which displays them. The dvd player doesn't (usually) understand them, but puts the data into the video signal untouched.
You also have to set a flag in the IFO file.
I have never gotten CC to work in DVD. IFOedit doesn't let me set the flag, and ccmux didn't seem to work.
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