iTunes automatically pauses when VLC plays a file

I noticed that if I have some background music on iTunes and I start playing a VLC video, iTunes automatically stops the music. Although this can be a very useful thing, I would prefer to have control of it, for example in my case I would like to keep listening the background music when I watch a non-music video. Is there an option in iTunes to disable pausing? I tried to look at the iTunes options but I didn't find any, perhaps it is a setting which cannot be changed?