Renaming ebook file meta title with file name

I'd like to be able to select a group of ebook folders (pdf's, epub's) and change each file's Title metadata to the filename of each file within each folder. I've tried the SetAttr META title command but I'm unable to drill down & modify files within selected folders. Any assistance would be appreciated. Thanks.

Put the Lister into FlatView - Mixed No Folders, and then Select All.