If you want to decode videodat you will have to rebuild bttv with 
"-DVIDEODAT" included in the EXTRA_CFLAGS, i.e. remove the "#"!

Decoding is divided into 2 separate steps:

- extraction of the videodat data stream from the VBI with vbidecode

- decoding of the stream with vd2exe (only supplied as binary)

If you start vbidecode as "vbidecode -vd" the videodat stream will be written
to vdat.cap (the right channel has to be selected of course).
You can get debugging information about the procedure by adding a "-v32".
A "." means a line of videodat data was read without problems, an "S" stands for
a missing start bit, an "s" for a missing stop bit.
A "X" means that the line contained no videodat data.

Later you will have to decode vdat.cap with vd2exe: "vd2exe vdat.cap".

You can also run both processes at the same time.
Create a pipe with the name vdat.cap: "mknod vdat.cap p" and start both 
programs at the same time: "vbidecode -vd & vd2exe vdat.cap"

