Doom9's Forum - View Single Post - eac3to

kevmitch · 11th February 2015, 13:26

This seems to be a semi-popular topic, but I don't think my specifc question has previously been answered.

With lord of the rings 6.1 dts-hd-ma audio

Code:

C:\> eac3to lotr.mkv
MKV, 1 video track, 5 audio tracks, 5 subtitle tracks, 2:07:41, 24p /1.001
1: h264/AVC, English, 1080p24 /1.001 (16:9)
2: DTS Master Audio, English, 6.1 channels, 24 bits, 48kHz
   (core: DTS-ES, 6.1 channels, 24 bits, 1509kbps, 48kHz)
   "Surround 6.1"
...

I decode it to flac (arcsoft 1.1.0.0)

Code:

C:\> eac3to lotr.mkv 1:lord_of_the_rings.flac

What order will the tracks be in the flac file for example if I open it in audacity?

I have verified that the flac is bit-for-bit identical (including channel order) to the makemkv decode results. This post on the makemkv forum says that the channel order should therefore be

L R C LFE Ls Rs Cs

However, if I produce my own 7 channel flac file (with libsoundfile/audiolab), I find that downmixing it with eac3to

Code:

eac3to my_7_channel.flac my_7_channel.stereo.flac -downstereo

emperically uses the following matrix

Code:

[[ 1.      0.      0.7071  0.      0.7071  1.      0.    ]
 [ 0.      1.      0.7071  0.      0.7071  0.      1.    ]]

which suggests that it is interpeting my file to have the order

L R C LFE Cs Ls Rs

Is this discrepancy due to differing channel mask between my file and that created by eac3to? Or is my first conclusion incorrect that eac3to places the centre surround channel last in the flac when decoding from dts-hd-ma?

11th February 2015, 13:26	#12969 \| Link
kevmitch Registered User Join Date: Aug 2013 Posts: 15	6.1 flac channel order This seems to be a semi-popular topic, but I don't think my specifc question has previously been answered. With lord of the rings 6.1 dts-hd-ma audio Code: C:\> eac3to lotr.mkv MKV, 1 video track, 5 audio tracks, 5 subtitle tracks, 2:07:41, 24p /1.001 1: h264/AVC, English, 1080p24 /1.001 (16:9) 2: DTS Master Audio, English, 6.1 channels, 24 bits, 48kHz (core: DTS-ES, 6.1 channels, 24 bits, 1509kbps, 48kHz) "Surround 6.1" ... I decode it to flac (arcsoft 1.1.0.0) Code: C:\> eac3to lotr.mkv 1:lord_of_the_rings.flac What order will the tracks be in the flac file for example if I open it in audacity? I have verified that the flac is bit-for-bit identical (including channel order) to the makemkv decode results. This post on the makemkv forum says that the channel order should therefore be L R C LFE Ls Rs Cs However, if I produce my own 7 channel flac file (with libsoundfile/audiolab), I find that downmixing it with eac3to Code: eac3to my_7_channel.flac my_7_channel.stereo.flac -downstereo emperically uses the following matrix Code: [[ 1. 0. 0.7071 0. 0.7071 1. 0. ] [ 0. 1. 0.7071 0. 0.7071 0. 1. ]] which suggests that it is interpeting my file to have the order L R C LFE Cs Ls Rs Is this discrepancy due to differing channel mask between my file and that created by eac3to? Or is my first conclusion incorrect that eac3to places the centre surround channel last in the flac when decoding from dts-hd-ma?