Streaming Media, Inc.
Nothing for live streaming as far as I can tell but a step in the right direction. It has been a couple of years for Real on the Mac (not including third party encoding solutions such as Cleaner).
From the article:
RealNetworks, Inc. (Nasdaq: RNWK), today unveiled a beta version of its new Real 10 Export Plug-in for Mac OS X. The Real 10 Export Plug-in enables video editors for the first time to export high-quality RealAudio 10 and RealVideo 10 formats directly from Apple Final Cut Pro, Adobe After Effects, Avid Xpress Pro and more. Support for additional applications, including Adobe Premiere and Discreet Cleaner is expected this summer.
Here is the direct URL for the QuickTime Component: http://www.realnetworks.com/products/realexport/