No worries, einsteen. It's the WTC7 CBS video from NIST that has the duplications, not the CD smear.
But that CBS copy came from you, so be aware! I don't know if it's the source or my dump at this point. The Naudet 50 fps does not have the problem. Here is a measure of image difference from one frame to the next on the CBS video:
The downward spikes are duplicates, the upward some sort of adjustment tweak. By comparison, the 'clean' Naudet video:
Running this test is now the first
thing I'll do on any video. I don't know the conditions of the Balzac CD videos. This seems to be a pretty common thing (resampling or whatever) and it vexes me. I want some good videos!!