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eac3to – Convert E-AC3 and TrueHD audio tracks to AC3 or FLAC

Submitted by on November 5, 2008 – 2:31 amNo Comment

Free Download: Command LineGUI

eac3to was designed to convert E-AC3 and TrueHD audio tracks to AC3 or FLAC. TrueHD conversion unfortunately doesn’t work with demuxed TrueHD files at this point in time. The to-be-converted TrueHD track must the first (or better: only) audio track in an EVO file. Please use the EvoDemux tool to create one EVO file for a full movie with only the TrueHD audio track in it.

Usage: eac3to src.eac3|evo|wav dst.ac3|flac|raw|wav [-options]

This tool can convert a 2.0 or 5.1 E-AC3 or a 5.1 TrueHD track to AC3/FLAC.

Here are some key features of “eac3to”:

– can show information about audio files
– can decode and encode various audio formats
– can remove dialog normalization from AC3, E-AC3, DTS and TrueHD tracks
– can extract AC3 stream from Blu-Ray TrueHD/AC3 tracks
– can extract TrueHD stream from Blu-Ray TrueHD/AC3 tracks
– can extract DTS core from DTS-HD tracks
– can remove DTS zero padding and repair outdated DTS-ES headers
– can apply positive or negative audio delays
– can reduce bitdepth of decoded audio data by using TPDF dithering
– can resample decoded audio data (using “r8brain”)
– can apply/reverse PAL speedup on decoded audio data (using “r8brain”)
– can demux all video and audio tracks of an EVO/VOB source file
– can join/rebuild multiple EVO/VOB files
– can remux the video track of a EVO/VOB source to Matroska

eac3to sourcefile[ sourcefile2] [trackno:] [destfile] [-options]

eac3to source.pcm destination.flac
eac3to destination.flac destination.ac3
eac3to source.evo 2: destination.eac3 3: destination.flac
eac3to feature_1.evo feature_2.evo movie.mkv

-448 use “192”, “448” or “640” kbit/s for AC3 encoding
-768 use “768” or “1536” kbit/s for DTS encoding
-core extract the DTS core of a DTS-HD track
/-100ms apply a positive or negative delay
-0,1,2,3,4,5 remap the channels to the specified order
-blu-ray remaps channels from Blu-Ray LPCM order to normal order
-downmix downmix 7 or 8 channels to 6 channels
-down16 downconvert decoded audio data to 14..23 bit
-slowdown reverse PAL speedup (25.000 -> 24.000/1.001 fps)
-speedup apply PAL speedup (24.000/1.001 -> 25.000 fps)
-resampleTo48000 resample audio to “44100”, “48000” or “96000” Hz
-quality=4 slowdown/speedup/resampling quality (0 = low; 4 = very high)
-mixlevel=181 back channel mixing level (0 = off; 256 = full volume)
-8 PCM file has “1”..”8″ channels
-16 PCM file is “16” or “24” bit
-little PCM file is “little” or “big” endian
-96000 PCM file is “44100”, “48000”, “96000” or “192000” Hz
-override forcefully overrides PCM auto detection with manual values
-sonic/nero/libav force the use of a specific decoder (not recommended)
-keepDialnorm disables dialog normalization removal (not recommended)
-demux EVO/VOB: demuxes 1st video track and all audio tracks
-no24p EVO/VOB: disables rewriting of MKV timestamps
-test checks if the external filters are installed & working

Supported source formats (only in demuxed form):
(1) RAW, (L)PCM
(2) WAV (PCM only)
(3) AC3, E-AC3
(4) DTS, DTS-ES, DTS-96/24, DTS-HD Hi-Res, DTS-HD Master Audio
(5) MLP, TrueHD, TrueHD/AC3
(6) FLAC

Decoded audio data can be stored as / encoded to:
(1) RAW, (L)PCM
(2) WAV (PCM only)
(3) WAVs (multiple mono WAV files, PCM only)
(4) AC3
(5) DTS
(6) FLAC

For best AC3, E-AC3 and TrueHD decoding you need:
(1) Nero 7 (Nero 8 won’t work!)
(2) Nero HD-DVD / Blu-Ray plugin

For best DTS decoding you need:
(1) “Sonic Cinemaster Audio Decoder 4.3” DirectShow filter

For DTS encoding you need:
(1) SurCode DVD DTS – version 1.0.21 or newer

For video muxing you need:
(1) Haali Media Splitter
(2) Haali Matroska Muxer
(3) MkvToolnix

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