I have searched a lot for this problem and tested various ideas I had in order to solve it, but nothing I did worked. So, I request some help from the community.
I have 2 sources: one at my home, one at my parents, on each’s private nas. We share our content via ftp, with user and password. The movies are not pirated, for those who ask the question 
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Sometimes, we both share the same movie and we see duplicates in the library. Is there any way to merge the duplicates or to show only one source?
Thank you in advance for your help!