I've uploaded 2 Time lapse videos to Youtube and Vimeo, both in 1080 HD resolution.
So you can have a look which one is better for Flash implementation, as well since the last upgrade from Youtube to support for 1080 and as well with the use of the Desktop up loader from Vimeo, what works flawless for the moment..
The only thing is that the image is quite dark, didn't check it on a windows PC and on my mac it was perfect. But I'll be upgrading and making the images lighter this week.
Cheers and enjoy,