An actual size FLV of my MPEG... possible?

I have converted my MPEG video recorded from my camcorder to FLV to use on “Flash CS4” using “Adobe Media Converter”. But the FLV playback on the “Flash player 10” is alot smaller than the playback of the MPEG video on “VLC”. Is there anyway to adjust any properties to get the FLV to the actual size of the MPEG video? I hope someone knows what i mean here. Thanks.