Multithreaded Video Converter on Mac? Is there an app for Mac that can distribute a single video encoding job to several thread to utilize the full potential of the system?

I used an application called iFlicks to do video encoding, and as far as I know, it's single-threaded, so even though it can use all my CPU time, it cannot squeeze the best performance out of my system.

I am using a 15" MacBook Pro with Retina Display.

Also, I knew that there were multithreaded ffmpeg implementation, but I can't figure out how to use that. If anyone could help, it's much appreciated.
Compressor by Apple not only one of the most fully featured encoders around and fully supports multiple threads, it even supports distributed encoding so that more than one Mac can work on a single job.