Alot has changed since. The bttv driver switched over to the new video4linux interface. It often happens that you don't get it right the first time. This is true for video4linux too. Bill Dirks works on the second version of the video4linux interface.
Debian users can fetch it with apt .
The content of the download directory . Check it out for older versions and patches. VBI decoder taken from Edgar Toernig' alevt application.