Helix MP3 Encoder

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The Helix MP3 Encoder was open-sourced by RealNetworks ca. 2005 via the (long-defunct) Helix community project. It originated from the Xing MP3 encoder, which was purchased by RealNetworks.

A current version, with contributions from HydrogenAudio members, is available as source code over at https://github.com/maikmerten/hmp3. This Wiki page discusses that version.


Features

  • Supports MPEG-1 and MPEG-2 modes
    • 48 kHz, 44.1 kHz, 32 kHz (MPEG-1)
    • 24 kHz, 22.05 kHz, 16 kHz (MPEG-2)
  • LAME headers for gapless playback
  • CBR and VBR encoding