get flv url from youtube videos

for a flash application I am building I need to stream a large flv file. My hosting can't stream this video in a good enough fashion. I decided to host my file on youtube and try and extract the flv file out of it. It is very difficult. This is not a duplicate, there are many questions about this issue. Youtube changed the way they store their flv files. Therefore, all solutions I found up until now don't work.

Does anyone have an i开发者_高级运维dea?