What's the best way of live streaming iphone camera to a media server?

According to this What Techniques Are Best To Live Stream iPhone Video Camera Data To a Computer? is possible to get compressed data from iphone camera, but as I've been reading in the AVFoundation reference you only get uncompressed data.

So the questions are:

1) How to get compressed frames and audio from iPhone's camera?

2) Encoding uncompressed frames with ffmpeg's API is fast enough for real-time streaming?

Any help will be really appreciated.

Thanks.