CLV disks don't have white flags - only the LD-V8000 even supported them on CLV, so there wasn't a point to putting it on any movie disks. I've had good luck so far using ffmpeg's pulldown detection, which supports regular deinterlacing as a fallback.

IIRC they were planning to use the time compressed Star Wars master for the CAV version but they couldn't get the white flags right on it. So the cadence is probably all wonky anyway. The JSC is also known for being off, sadly.

The VBI data itself is pretty easy to work with - I have basic but imperfect sample code for the frame #s, and recognizing the white flag is trivial... getting it into a regular workflow is the problem.