Why does the ProTranscoderTool_sb run amok?

Every time I open iMovie, when iMovie loads, after a few seconds the fan comes on, and I know something is not right. With the Activity monitor I discovered that the ProTranscoderTool_sb uses up anywhere from 110 to 166 % (!!!) of the CPU capacity.
My questions are:
1. What does the ProTranscoderTool_sb do?
2. Why is it in overdrive all the time?
3. How can I stop it from doing this?
MacBook Pro, 10.9.2
Thanks,
Klaus

It is creating ProRes versions of your clips in the background.  If you have recently imported a lot of clips or updated a lot of projects from iMovie 9 there will be a large backlog of transcoding to do.  Best to let it run while you are away from your computer for a few hours. 
Geoff.

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