Netflix encoding system - MAPLE
MediaEncodingCluster is an Enterprise Class, Video Cluster Environment with a Plattform Independent Client - Server Architecture for distributed video/audio converting/encoding tool over a grid Computing Network Design. more on http://docs.codergrid.de

Note: I haven't personally tried this yet. I'll update with some benchmarks when I do.

Sources:

https://sourceforge.net/projects/bripper/

http://codergrid.de/trac/