I did about 10 test captures using various settings, only later did I capture the clip with the flames and noticed the problem.
I'll go back and do tests of just that section.
This is the control panel in question for the ADVC-300 with its default settings:
I had the 3D and 2D NR off with y/c separation mid-hi—that's the comb filter, right?
Plus I have these to fiddle with:
That's my screen-cap quota for the day ...