FWIW, I use a minidlna instance on a Raspberry Pi to serve my media around the house and I have never had an issue with it discovering newly downloaded media.

FWIW, I use a minidlna instance on a Raspberry Pi to serve my media around the house and I have never had an issue with it discovering newly downloaded media. It currently serves around 3TB of video and audio files, and new files are added daily. I haven't restarted either the Pi or the minidlna service for many months. I choose this option because it is a very light-weight solution with no features that I will never use (like trans-coding or metadata downloading, poster art etc).