http://fixounet.free.fr/avidemux/That's what I use when I need to transcode something.
Pazera Free FLV to AVI Converter
Pazera Free FLV to AVI ConverterThis is the one I use on a Win7 64-bit. Works quite well (might have to tweak the settings a bit, but that's all). No crashing/freezing.For fun, I sometimes download relevant YouTube clips and smash them into a mini-movie. My video editor won't take .flv files but will take .avi files. This gets the job done nicely.