

I use Tempus with Navidrome. Transcoding should be transcoding down to a format more appropriate for your bandwidth, so flac should be getting to your device as an mp4 or vorbis stream.
17GB seems high unless something else is going on, like your Tempus client trying to download all your tracks to your device.

This was put in the actual files by the encoder. Check the “Description” field in your library of music files. I’ve also found weird tags in the comment field as well. I had to do this to my entire collection, I ended up just writing an opus script to just clear that field out.
You will need to refresh your collection to reflect the changes and those “ads” should be gone.