FormatDrop
Audio Format

EAC-3

Dolby Digital Plus (Enhanced AC-3)

EAC-3 (Enhanced AC-3), also marketed as Dolby Digital Plus, is the modern evolution of Dolby's AC-3 codec. It powers the audio on Netflix, Disney+, Amazon Prime Video, and HBO Max. EAC-3 supports up to 7.1 channels at much higher bitrates than its predecessor, and forms the transport layer for Dolby Atmos object-based audio metadata.

What is EAC-3?

EAC-3 is a backwards-enhanced extension of AC-3. It uses the same core psychoacoustic model but adds a more efficient bitstream structure, extended channel configurations (up to 15.1), and a metadata container for Dolby Atmos spatial audio objects. Streaming platforms deliver EAC-3 in MP4/ISOBMFF containers, where it appears as the 'ec-3' codec tag. Dolby Atmos content adds a JOC (Joint Object Coding) extension on top of the 7.1 EAC-3 core.

EAC-3 pros and cons

Advantages

  • Higher efficiency than AC-3 — better quality at lower bitrates
  • Up to 7.1 channels in standard mode
  • Dolby Atmos metadata support for object-based spatial audio
  • Required codec for Netflix, Disney+, and Amazon OTT delivery
  • Lossless core can be embedded for Blu-ray Ultra HD

Limitations

  • Not backward-compatible with AC-3 hardware decoders
  • Requires EAC-3 certified hardware or software for full decode
  • Dolby Atmos requires additional licensing for authoring
  • Cannot be muxed into standard MP4 without fragmented MP4 (fMP4)
  • Less universal than AAC for general audio use

When should you convert EAC-3 files?

Convert EAC-3 to AAC when you need audio for standard MP4 files, iOS/Android playback, or platforms that don't support EAC-3. Convert EAC-3 to AC-3 for DVD authoring or legacy Dolby Digital receivers. Use FFmpeg: `ffmpeg -i input.eac3 -c:a aac -b:a 256k output.aac` or `ffmpeg -i input.mkv -c:a ac3 -b:a 384k output.ac3`.

Convert EAC-3 files

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EAC-3 FAQ

How do I tell if a video file contains EAC-3 audio?
Use FFprobe: `ffprobe input.mkv 2>&1 | grep Audio`. EAC-3 shows as 'Audio: eac3' or 'Audio: ac3 (EAC3)'. In VLC: Tools → Codec Information → Audio tab shows the codec name.
Can my AV receiver decode EAC-3 from Netflix?
Modern AV receivers (2012+) with HDMI ARC or eARC support Dolby Digital Plus passthrough. Older receivers without eARC may downmix EAC-3 to stereo or not decode it at all — in that case, your TV decodes EAC-3 and sends PCM to the receiver via ARC.
What is the bitrate of EAC-3 on Netflix?
Netflix uses EAC-3 at 640 kbps for 5.1 audio and up to 768 kbps for Dolby Atmos (7.1.4) content on their premium tier. Standard plan audio is typically Dolby Digital (AC-3) at 192 kbps or stereo AAC.

More formats

HEICWebPAVIFEPUBWebMOpusMP3WAVM4AFLACAACMP4AVIMKVMOVJPGPNGGIFSVGTIFFICOBMPEPSARWOGGWMVPPTXPagesPDFDOCXRAWHEVCH.264AIFFM4VWMA3GPDNGRTFPSDOGVTSFLVAIXLSXCSVZIPAPNGMIDIJPEG XLMPG/MPEGVOBM2TSAC3ALACDTSJP2HEIFAPECBZ3G2SRTDOCPPTXLSODTODSM3URAR7ZM4BAMRTXTMOBITARGZJSONXMLYAMLKEYMTSCR2NEFMXFTGACAFASSVTTDSFRMF4VWVASFRMVBORFRW2TTA