i tested your solution and the problem persist:
MPEG2Source("C:\v send\VTS_01_1.d2v", cpu=0,idct=5)
Telecide(post=0)
If you use avpsmod, zoom the frame (200% or more), seek to frame 988 (maybe you have to turn up a little the brightness of the monitor) and step frame by frame and you'll see the problem.
Look at her black dress, it's like some residual combing or something like that, the funny thing is that the bombed pixels some times move even if the frame is a duplicate. Because of that i get too much false positive on the combed frame detection.
Maybe the authoring house is using a really crappy mpeg2 encoder. As long as you can confirm that is not a bug on MPEG2Source, i'll just leave it as is (or maybe you have some nice trick you can suggest
Thanks
(The DVDs are from Media Blasters)