I was doing some side-by-side comparison's a minute ago with a 400kbps WM9 file vs. a 315kbps FLV8 single-pass file.
The FLV8 file was created from the WM9 file so it couldn't possibly look better.
What I did notice is that there was no noticeable loss in quality that I could tell looking at 3 different files and what was odd is that the FLV8 file was noticeably brighter in each instance. The clips were a little dark so it actually helped.
Any ideas why?
Based on what I saw I see no reason to even bother with 2-pass, especially given the extra encoding time. At the 300kbps'ish range, has anyone noticed a real difference between 1-pass and 2-pass? Are there certain types of videos were it helps more? High-motion, etc?