I'd be interested in contributors helping out with my project. It's kind of in a nascent stage, but I have developed a library for streaming from iOS with it.

http://www.github.com/jamesghurley/VideoCore

It's a real-time a/v capture/transform/encode/output library (currently iOS-only, but I want to bring it to other platforms at some point)

It is written in C++ and some Objective-C.