I use MPEG Streamclip to make FLVs and find that it gives me good enough quality for my needs, which are usually importing into Prezi for teaching and giving presentations. I find it in file -> Other Formats -> Flash Video (FLV); the Options tab gives quality options. I have a Mac, and I did at one point have a full version of Flash installed, but I uninstalled it a while back and the converstion in Streamclip still seems to work...