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Is the .sup file containing timing information or bitmaps only?
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For a DVD the .sup holds the bitmap, plus its position, its start time (PTS) and duration, plus also the indexes of the colors on a palette (CLUT) stored in the corresponding IFO file.
Some other references about SUP format:
http://www.mpeg.org/MPEG/DVD/Book_B/Subpic.html
http://dvd.sourceforge.net/dvdinfo/spu.html
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