I have something in the registry and found as
the quality of video (MPEG4) can improve.
Under this key you can Reserved memory of the camera:
"DesiredMemory" = dword: 8192
I have experimented a bit and found that the value of 8192
(original 4096) is the best compromise between memory and quality.
Less would the quality would deteriorate, and more
the device is slow overall (the start of the camera).