Just as with iTunes before them, the new media apps allows us to create a new library, or select an existing library by holding alt and double-clicking the application's bundle in ~/Applications.

But when I try to do this, I always get a dialog with this message:

You cannot change the video library at this time because the current library is in use by a device. Sign in without connected devices to change your video library.

I 'ejected' my iPhone in Finder and it's not even on Wi-Fi as I try this. I have also signed out of my Apple ID in System Preferences.

I'd like to move the library files somewhere else, because I don't find the default locations agreeable. How can I do this?

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