Chris:
I'd check the frame rate on your original files.
We don't do video grabs within XPression, but sometimes I'll get sent a file that, even though it is 1280x720, it was rendered at 30fps.
The XPression Video Coder won't convert this - it just takes every 60 frames and crams them into a second, resulting in double-speed playback.
So as a guess, you might have a mismatch between the frame rate in your capture settings and your project settings.
Spencer
#Carbonite