Have you installed Flash Encoder? You need that for QT or FCP to export flv. When you Export from QT you choose Movie to Flash Video (flv). When you click Options you can adjust various settings. In FCP, Export Using QT Conversion. In Format choose Flash Video (flv). Options works as mentioned above. I’ve never used Compressor to make flvs (I use Sorenson Squeeze). I’m not sure you can make flvs with Compressor, but you can make an H.264 and change the extension from .mov to .flv and it will work. The latest Flash Player will work with H.264 files with the extension changed to .flv.
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.5 QT7.5.5 Kona 3 Dual Cinema 23 ATI Radeon HD 3870
ATTO ExpressSAS R380 RAID Adapter, PDE Enclosure with 8-drive 6TB RAID 5
24″ TV-Logic Monitor
Final Cut Studio 2 (up to date)
Pro Tools HD w SYNC IO, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN