I'm not familiar with Emby myself, but I have the same problem ripping featurettes and extras for use with Plex. I have actually just given up on it, since Plexpass includes access to their streaming extras whenever they are available. They have a good number of titles covered; most newer titles, anyway.
However, when I was cataloging them, I can attest to Blu-ray.com as a resource for disc info and featurette titles, I would use their reviews as a reference. They do a great job of listing and summarizing extras, including the key element here, the video duration. If you can get the duration of each of your files, you should be able to 80/20 map each of them to a title based on the Bluray.com review list of extras. Its not perfect, but if you really want them, I think this is your best shot outside of watching each one and hoping you get to a title card early on.
This is mentioned in a reddit r/plex post that I cannot link here since I am such a newb!
Someone there mentions dvdcompare.net, but I cannot attest to its worth here, as I have never used it.
GL and happy ripping! What software do you use to rip?