The majority of the files cannot be found.
23:38:25.978 T:1765552880 WARNING: Process directory 'smb://BRIGHTBOX2/USBBacup/Music/Amazon MP3/Duran Duran/' does not exist - skipping scan.
Are you able to ping BRIGHTBOX2 from the Pi? Is the share still available?
On the files that it does find, it can’t find any information.
23:23:23.898 T:1800401648 WARNING: No information found for item '/media/USBBacup/BBCIplayer2/Sex__Drugs__Rock__Roll_-__b01sd320_default.mp4', it won't be added to the library.
Try renaming some of the files to the correct format and see if that helps.