The option to export as FLV from FCP comes only if you installed Adobe Flash CS3. Flash CS3 had the option to install the FLV conversion component to Final Cut.
The CS4 package has NO more this feature… not sure why.
I just recently updated my CS4 softwares to the latest update…and now when I export my timeline to quicktime and I use Adobe Media Encoder CS4 to create an FLV…..the end result is a greyed out and washed out video. Not sure why as in the preview it shows all good.
…problems…