I would like to use my site as a "gateway" for watching flash-videos in HTMl5.. Is this possible? What are the requirements?
There's an app that already does this called skyfire.
For example, on the iPhone, pulls out requests to flash video files and converts them server-side into HTML5 and re-embeds them into the page.
I haven't tried it, as its reviews are a bit rubbish at the moment (supposedly only works on certain websites), but its a proof of concept that it can be done.