How to sync video from pc to iphone through itunes?

I want to sync "home videos" to my phone but then there's this pop up (see picture).
I inserted the videos to itunes by clicking "add file to itunes library" but when I tried syncing "films" to my phone, it says that the videos are stored in a different itunes library?

Try using the Share feature in Quicktime Player 7, instead.

The Share TAB will appear when you play the video, in Quicktime player, on your desktop PC.

Connect the phone with the cable and click sync button. It's very easy.

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