I did some more testing and couldn't repeat the 'dropped frames' I was having last time. The size on HDD went up proportional to the fps captured at. At 25fps I could visually see the differences compared to 5 or 10fps though, so compression was definately effecting the quality, but not the filesize.
The comparison between YUY2 and IYUV still stands though, since for the same fps rate the filesize was always bigger.
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