RCWT (Raw Captions With Time), version 0.001
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File header (11 bytes), required:

byte(s)   value   description
0-2       CCCCED  magic number, for Closed Caption CC Extractor Data
3         CC      Creating program.  Currently Defined:
                       CC -> CCextractor.
4-5       0052    Program version number
6-7       0001    File format version
8-10      000000  Reserved

Time header, required for every group of data packets
0-7       <var>   FTS value (Time in ms)
8-9       <var>   (1-65535) Number of caption data blocks with this time
                 stamp.  If the number of blocks exceeds 65535 write
                 another time header for the remaining blocks.

Caption data
0-2       <var>   Three byte caption data.

Notes:

- Data is in process order, i.e. the 608 or 708 decoders can process it 
  sequentially. Programs generating files in this format are responsible
  for sorting the data when needed.
- FTS is the time, in milliseconds since the beginning of the file, 
  starting in 0.
- The closed caption data is always 3 bytes, the first of which is the
  cc_type and cc_valid fields and the other two are the actual data
  pairs. Depending on cc_type, they will be EIA-608 or EIA-708 data.
