7.1 Channel confusion, quick confirmation required.

[boxrick]

I have a very quick question which i cannot seem to find an answer to online.

Using Eac3to i have demuxed a 7.1 THD file into 8 mono wav files.

C.wav
LFE.wav
R.wav
L.wav

(all of these reasonably obvious as to what they are)

However normally i would use a 5.1 source and there would be surround left and surround right, a 7.1 source is a little different.

So the remaining wavs are SL.wav SR.wav BL.wav and BR.wav. Which i would have though were obvious but just to make sure.

Is the following layout i did correct or have i got my channels muddled?

http://www.boxrick.com/71.jpg

Cheers!

[tebasuna51]

SL, SR are Side channels (-90º and +90º from C channel)
BL, BR are Back channels (-150º and +150º)
To obtain the 5.1 Surround channels (-120º and +120º) you need mix the Side and Back channels.

Use eac3to to obtain the mix automatically:

eac3to input71.thd output51.wavs -down6

[boxrick]

I was just changing it into a LPCM as opposed to a TrueHD mix since my A110 and Receiver seems to be having issues with 7.1 TrueHD files ( works fine with 5.1 ones though ). Ideally id like to keep the rear 7.1 channels and let my amp deal with them ( i am suspecting it mixes them into the 2 rear channels automatically? or does it simply disgard them ? )

[tebasuna51]

I don't know if your PopCorn A110 can send PCM 5.1 or 7.1 to your receiver by HDMI.
Also don't now your Receiver. Then I can't answer your question.

To mux uncompressed audio to mkv (MkvMerge) you need:
eac3to input71.thd output.wav (-down6 )?

To mux uncompressed audio to m2ts (tsMuxeR) you need:
eac3to input71.thd output.w64 (-down6 )?

[rapscallion]

Slightly OT.

In the op's ch diagram, is that the most common BD 7.1 ch layout ?

I ask because the DTS-MAS has another layout where SL and SR instead of being +/- 90 degrees from center,
are very close to to the rear speakers. Is that a layout that would ever be used in a commercially released BD ?

[tebasuna51]

Yes, is the standard layout.

[rapscallion]

Thanks !