no idea... i've never heard of any.
but if you searched google you would find this
http://labnol.blogspot.com/2006/07/1...n-do-with.html
so you can at least cut them with flv parser... but for the sound you'll have to look further. if it's really necessary you could always convert them to another format, edit that and then convert them back, but that would no doubt destroy the quality though.