If I convert an MP3 file to opus, with the same bit rate and

>>57738305

>converting mp3 to opus

You need convert FLAC or WAV to Opus, not MP3.

>>57738402
I currently have a library of mp3 files around 40 gb, and i'm trying to reduce the file sizes to fit it on my 6p. Is there a better way to do this?

>>57738588
Yup, upload them to Google Play Music and use that.

>>57738588
Buy a 64GB card because the file size wont save you much and I have to assume a lot of your files are already 128kbps

>>57738588
>Is there a better way to do this?
Reduce the bitrate. Same result as transcoding it to another lossy format.

I assume 6p is a phone. Another option is not to put all the music on the phone. Third option is to set up a server at home and stream it to your phone.

Google Play Music is a botnet.

>>57738679
Teach me wise one

>>57740223
You can do mpd + icecast, but I think this might be a better solution for you.

http://www.subsonic.org/

>lossy to lossy

>>57738305
Will be worse, another set of compression artifacts on top of the ones from the first compression. Even if you used higher bitrate. Basically it doesn't make sense to do it.