What's behind ESPN having such high quality streaming for the World Cup through Flash?

I'm aware of Stratus which is used for ChatRoulette with a requirement 开发者_JAVA百科of Flash 10. Does anyone happen to know if ESPN uses the same technology or is it just the sheer amount of servers they have which makes this possible?

According to here it's a combination of the new FMS3.5, adaptive bitrate streaming, Flex 4 and OSMF. I guess the performance/quality wins comes from the adaptive bitrates? Nothing about stratus, though, and that blog is from an Adobe evangelist, so I guess he'd have mentioned if it was involved. All together pretty damned impressive though, I agree.