Folder icons in atv2 version

I am running Infuse on a jailbroken atv2. I notice that some of the file folder icons in both TV and Movie lists on my shared drive have little “movie frame” art on them while other file folder icons are not decorated in this way. I cannot see any difference in the content of the two types of folders. What gives?

i figured it out for myself. The blank folders have other folders nested inside. The folders with little film clip decoration have media directly inside them.