Where does iVI store cached files during conversion?

Restarting iVI should clear out any cached files but just in case for the latest App Store version it's at ....

/Users/<your home folder>/Containers/com.southpolesoftware.iVI/Data/Library/Caches/com.southpolesoftware.iVI/

... and for iVI Pro it's at ....

 /Users/<your home folder>/Library/Caches/com.southpolesoftware.iVI/