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Dolby AC-4

Next-generation AC-4 codec with advanced features and flexibility.

Examples

deezy encode ac4 input.mkv
deezy encode ac4 --encoding-profile ims_music --bitrate 512 input.mkv
deezy encode ac4 --ims-legacy-presentation --bitrate 448 input.mkv

Key points

  • Minimum channels: 6 (5.1) or higher
  • TrueHD Atmos sources automatically retain immersive object metadata when converted to AC-4
  • AC-4 supports multiple independent DRC profiles for various playback scenarios

Common options

  • --encoding-profile (ims, ims_music)
  • --ims-legacy-presentation
  • --bitrate
  • DRC options: --ddp-drc, --flat-panel-drc, --home-theatre-drc, --portable-headphones-drc, --portable-speakers-drc