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It is extendable by plugins and supports many backends: En-/decoding: oggenc/oggdec, lame, gogo, faac/faad, mppenc/mppdec, flac, mac, mplayer, ffmpeg, shorten, ttaenc, bonk, ofr, ofs, wavpack, lac, lpac, speexenc/speexdec, timidity Replay Gain: vorbisgain, mp3gain, aacgain, replaygain (MusePack), metaflac, wvgain CD ripping: kio_audiocd, cdda2wav, cdparanoia This way you can convert between various audio formats: Decoding: ogg, mp3, mp2, m4a/mp4, aac, 3gp, mpc/mp , flac, ape, wma, asf/asx, ra, rv, rm, avi, mpeg, wmv, qt/mov, flv, ac3, au/snd, shn, tta, bonk, ofr, ofs, wv, la, pac, spx, mid, mod/s3m/stm/ult/uni/xm/m15/mtm/669/it, wav Encoing: ogg, mp3, mp2, m4a, aac, mpc, flac, ape, ra, ac3, au, shn, tta, bonk, ofr, ofs, wv, la, pac, spx, wav