John,

I've seen video or sounds artifacts that occured  after Youtube's
conversion in two cases:

1. I've seen the "pop" noise that occured
when I converted the video files from K-7 or from a P&S Lumix ZR-1
into something with compression (like mp4 with mp3 or aac sound
compression), and then uploaded the more compressed files to Youtube.

2. When creating a slideshow with an audio track in LR3 and saving 
it as an mp4, I saw video artifacts - mostly occuring in the transitions
(fading) between slides.  In this case, the length of the transition
between slides, and the length of slide displaying were affecting
the artifacts.
(Here is the reasonably-working 10th[!] version of that video-clip: 
http://www.youtube.com/watch?v=0lJcGkg_Rgg )

So, I think the popping sound is the result of some interference of the
compression with the conversion. 
The way I would try to overcome this is to play with the codec settings
in the conversion.

Igor

PS. Thank you, Darren, for the information about VirtualDub. 
I've downloaded it, and will try later.


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