Removing a Chroma Key Background from a mpg file in Flash?

Hi, I was just curious to know if I were to import a mpg file, I believe that would be the correct video format file, into flash, with the mpg file having someone talk on a chroma key background, could you remove that background in flash, or do you need some kind of video editing software? thanks for any help.

You’re best to extract the keyed background in an external application such as After Effects, then render out to an interim format that supports an alpha channel (i.e transparency). Import this to flash and encode as on2 vp6 (the only flash video format that supports an alpha channel)