If you encode quite often for youtube you might utilize this workflow: Create quick cluster, export your movie as reference one, open it with Compressor, apply preset for youtube, submit for encoding and choose cluster instead of ‘this computer’.
It’ll load all cores and gives you significant, many times, boost to processing time.
Then you can upload video on youtube via web interface.
Sony PMW-EX3, Canon Mark II 5D, FCS3 in Moscow
http://www.mokaeff.com