I’m ditching streaming services and just going with local music. However all my CDs are converted to either flac or 320kbps mp3 files on my PC and thus far too large for the limited storage I have on my phone.
I was hoping there might be an app that would automatically downconvert to something like 128kbps and then copy over to the Music directory on my phone. A bit like how Calibre can automatically convert eBook files (e.g. mobi to epub) and then send them to your ereader?
This might be a bit overkill for what you want but you could try using a selfhosted music server like navidrome and streaming to your phone. I use symfonium on on phone which can be configured to request the streamed music to be transcoded to a smaller size for streaming from mobile network or for caching it on your phones storage for offline listening.
Given that symfonium supports a lot of self hosted media providers from which to pull, you could also try sharing your music locally using samba. I’m not sure if the transcoding still works in that case though (it would obviously have to be done on your phone)