Upgrading older rips?

Ahoy!

Once long ago I ripped some movies from DVD, and in ignorance, saved to a lossy format. (The DVDs have also long since gone.) This was fine for a time but now as TVs are getting bigger and quality is improving, I am seeing the compression artifacts.

Does anyone know of some software that will scan a directory for media, identify the codec used, and then find better quality rips present for download & replacement? I would rather not go through the process manually and I have to imagine I'm not the only one that's had this issue.