According to the man page for vorbisgain, you should be able to add *.ogg to the end of the directory path so that it only examines files with a .ogg extension.
vorbisgain -a -f -r "/media/music/ogg/Slayer/*.ogg"
MPD replaygain worked on mp3 (id3v2), vorbis, MPC.. had trouble with flac (old bug ?) and aac.
Replay Gain audio players in LinuxQuod LibetTo enable Replay Gain adjustment in Quod Libet, go to the Music menu, then select Preferences. In the preferences window that appears, open the Player tab. Then check the box labeled "Replay Gain volume adjustment". In my test, Quod Libet was reducing volume on FLAC and Ogg Vorbis tracks with a negative gain, but it wasn't playing tracks with a positive gain any louder than tracks which weren't tagged (possibly it was doing this to prevent clipping). I don't know whether Quod Libet uses album or track gain values when it adjusts volume.
is this possibly another reason to move foobar2k further down the page??
manthis, which version of Quod Libet are you using, and where do you get hold of the plugins that add those features?I'm using version 1 (standard in Ubuntu) and it has no plugins by default.
-a -c -s i -s