I have recently been dealing with a problem on Linux, where I had video files on an NTFS partition that was mounted as a subdirectory of /var. These files didn't show up while scanning the Media Library. At first I thought that it was due to some incompatibility with fusefs, but after contacting the devs, it turns out that Videostream blacklists parts of the file system hierarchy when scanning for files!
The developers where so kind to provide me with a reference list of blacklisted directories, so I thought I'd post them here for anyone that encounters similar problems. The directories Videostream will not scan for files are:
You should mount any shared media partitions somewhere else, like under /media.