Free and Open Source Software

Does anyone know of a self hosted media streaming service similar to Plex that will allow me to stream videos as audio only? Or better yet, to be able to sync/download them as audio only?

I have been going through and ripping hundreds of discs and hosting them on Plex, but my gf likes listening to shows while she sleeps and I like listening to movies while I commute.

Having the ability to use less data, less phone storage, and not have the screen on would be great.

Our solutions so far are: For movies, use external player of vlc and select audio only. For TV shows this will not play the next episode so I have a batch file I run that uses ffmpeg to extract the audio tracks and relabel them such that TV franchises are "Artists," TV shows are "Albums," seasons are "Discs" and episodes are "Tracks"

But this is still a bit of pain, I was wondering if anyone knew of apps that could do this natively.