As said in the summary.
This means that local files won't play when using ffmpeg 3.x, which is required by some other packages. The same also applies to spotify 1.0.53 (no ebuild for it at the time I'm writing this).
I originally found the issue here: https://community.spotify.com/t5/Desktop-Linux-Windows-Web-Player/Linux-Local-files-do-not-play-on-Ubuntu-16-04-SOLVED/td-p/1343831 and attempted similar workaround (except without potentially breaking something by adding libraries outside of portage): I downloaded the proposed files and set LD_LIBRARY_PATH to point to that location when running spotify.
Steps to Reproduce:
1. Install spotify with media-video/ffmpeg 3.x installed (I'm not sure which version of media-video/libav would be equivalent)
2. Get spotify 30-day premium trial
3. Add local files to your spotify library and try to play them
Spotify won't play these files and will show confusing message "This song is not available. If you have the file on your computer you can import it"
Spotify should play local files
I'm not even able to add the files to test, can you confirm it's still broken? 1.0.59 was just packaged. Even if it is broken we can't really fix it I don't think since it seems to be a problem with the spotify client itself.