Thanks -- the two-step procedure chart was quite helpful.
Is there quite a bit of controversy about this subject? (I'm just curious why the professor in the video -- who appears to know his subject quite well in general -- would mess something like that up if it was a widely accepted rule...)
There's no controversy about what the pronunciation of
virumque would be, and I'm not sure why he mispronounces it, but there is a controversy about accentuation after enclitics in general. The rule as it's frequently given is that the accent always goes on the syllable that immediately precedes the enclitic, this based on what some ancient grammarian says (like 4th century AD). Others say that that's a simplification that applies most of the time, but things are a bit more complicated.