Packages with the mpg123 use flag

games-fps / gzdoom : A modder-friendly OpenGL source port based on the DOOM engine

  • Enable support for MPEG audio playback via media-sound/mpg123

media-sound / loudness-scanner : Scans your music files and tags them with loudness information

  • build the mpg123 plugin

media-sound / mpd : The Music Player Daemon (mpd)

  • Enable support for mp3 decoding over media-sound/mpg123