Batch Convert Audio Files To MP3 On Mac OS X. MP3 Encoder is an application for converting a variety of audio formats to MP3 using the high quality LAME encoder. Designed for ease of use, simplicity, and above all, the highest possible quality mp3 files. Supports a wide variaty of input formats including AAC, AIFF, Apple Lossless, FLAC, OGG Vorbis, WAV, WMA, and more!